1
|
Castañeda-Morales E, Gómez-Gómez FA, Li Y, Manzo-Robledo A. Insights in Pt-based electrocatalysts on carbon supports for electro-oxidation of carbohydrates: an EIS-DEMS analysis. Front Chem 2024; 12:1383443. [PMID: 38783898 PMCID: PMC11112023 DOI: 10.3389/fchem.2024.1383443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 04/15/2024] [Indexed: 05/25/2024] Open
Abstract
In this work, the electrochemical oxidation of carbohydrates (glucose, fructose, and sucrose) was induced at the interface of Pt-nanoparticles supported on different carbon-based materials as carbon vulcan (C) and carbon black (CB). It was found that the support plays an important role during carbohydrates electro-oxidation as demonstrated by electrochemical techniques. In this context, current-concentration profiles of the redox peaks show the behavior of the pathways at carbohydrates-based solutions. Herein, the trend of current measured was glucose > sucrose > fructose, attributed to differences in the organic functional groups and chain-structure. Raman, XRD, SEM-EDS and XPS put in clear important structural, morphological, and electronic differences linked with the intrinsic nature of the obtained material. Differential Electrochemical Mass Spectroscopy (DEMS) indicated that the selectivity and the conversion of the formed reaction products during oxidation is linked with the catalyst nature (distribution, particle size) and the interaction with the carbon-based support.
Collapse
Affiliation(s)
- Eleazar Castañeda-Morales
- Instituto Politécnico Nacional, Laboratorio de electroquímica y corrosión. Escuela Superior de Ingeniería Química e Industrias Extractivas, Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos, Mexico City, Mexico
| | - Fabio A. Gómez-Gómez
- Instituto Politécnico Nacional, Laboratorio de electroquímica y corrosión. Escuela Superior de Ingeniería Química e Industrias Extractivas, Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos, Mexico City, Mexico
| | - Yueyin Li
- Universidad de Anahuac Campus norte, Mexico City, Mexico
| | - Arturo Manzo-Robledo
- Instituto Politécnico Nacional, Laboratorio de electroquímica y corrosión. Escuela Superior de Ingeniería Química e Industrias Extractivas, Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos, Mexico City, Mexico
| |
Collapse
|
2
|
Yang J, Liu S, Liu Y, Zhou L, Wen H, Wei H, Shen R, Wu X, Jiang J, Li B. Review and perspectives on TS-1 catalyzed propylene epoxidation. iScience 2024; 27:109064. [PMID: 38375219 PMCID: PMC10875142 DOI: 10.1016/j.isci.2024.109064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024] Open
Abstract
Titanium silicate zeolite (TS-1) is widely used in the research on selective oxidations of organic substrates by H2O2. Compared with the chlorohydrin process and the hydroperoxidation process, the TS-1 catalyzed hydroperoxide epoxidation of propylene oxide (HPPO) has advantages in terms of by-products and environmental friendliness. This article reviews the latest progress in propylene epoxidation catalyzed by TS-1, including the HPPO process and gas phase epoxidation. The preparation and modification of TS-1 for green and sustainable production are summarized, including the use of low-cost feedstocks, the development of synthetic routes, strategies to enhance mass transfer in TS-1 crystal and the enhancement of catalytic performance after modification. In particular, this article summarizes the catalytic mechanisms and advanced characterization techniques for propylene epoxidation in recent years. Finally, the present situation, development prospect and challenge of propylene epoxidation catalyzed by TS-1 were prospected.
Collapse
Affiliation(s)
- Jimei Yang
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Shuling Liu
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Yanyan Liu
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
- College of Science, Henan Agricultural University, 63 Nongye Road, Zhengzhou 450002, P.R. China
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Lab for Biomass Chemical Utilization, Nanjing 210042, P.R. China
| | - Limin Zhou
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Lab for Biomass Chemical Utilization, Nanjing 210042, P.R. China
| | - Hao Wen
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Huijuan Wei
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Ruofan Shen
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Xianli Wu
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| | - Jianchun Jiang
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Lab for Biomass Chemical Utilization, Nanjing 210042, P.R. China
| | - Baojun Li
- College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P.R. China
| |
Collapse
|
3
|
Adams J, Chen H, Ricciardulli T, Vijayaraghavan S, Sampath A, Flaherty DW. Distinct Site Motifs Activate O 2 and H 2 on Supported Au Nanoparticles in Liquid Water. ACS Catal 2024; 14:3248-3265. [PMID: 38449529 PMCID: PMC10913054 DOI: 10.1021/acscatal.3c05072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 03/08/2024]
Abstract
Au nanoparticles catalyze the activation and conversion of small molecules with rates and kinetic barriers that depend on the dimensions of the nanoparticle, composition of the support, and presence of catalytically culpable water molecules that solvate these interfaces. Here, molecular interpretations of steady-state rate measurements, kinetic isotope effects, and structural characterizations reveal how the interface of Au nanoparticles, liquid water, and metal oxide supports mediate the kinetically relevant activation of H2 and sequential reduction of O2-derived intermediates during the formation of H2O2 and H2O. Rates of H2 consumption are 10-100 fold greater on Au nanoparticles supported on metal oxides (e.g., titania) compared to more inert and hydrophobic materials (carbon, boron nitride). Similarly, Au nanoparticles on reducible and Lewis acidic supports (e.g., lanthana) bind dioxygen intermediates more strongly and present lower barriers (<22 kJ mol-1) for O-O bond dissociation than inert interfaces formed with silica (>70 kJ mol-1). Selectivities for H2O2 formation increase significantly as the diameters of the Au nanoparticles increase because differences in nanoparticle size change the relative fractions of exposed sites that exist at Au-support interfaces. In contrast, site-normalized rates and barriers for H2 activation depend weakly on the size of Au nanoparticles and the associated differences in active site motifs. These findings suggest that H2O aids the activation of H2 at sites present across all surface Au atoms when nanoparticles are solvated by water. However, molecular O2 preferentially binds and dissociates at Au-support interfaces, leading to greater structure sensitivity for barriers of O-O dissociation across different support identities and sizes of Au nanoparticles. These insights differ from prior knowledge from studies of gas-phase reactions of H2 and O2 upon Au nanoparticle catalysts within dilute vapor pressures of water (10-4 to 0.1 kPa H2O), in which catalysis occurs at the perimeter of the Au-support interface. In contrast, contacting Au catalysts with liquid water (55.5 M H2O) expands catalysis to all surface Au atoms and enables appreciable H2O2 formation.
Collapse
Affiliation(s)
- Jason
S. Adams
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Haoyu Chen
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Tomas Ricciardulli
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Sucharita Vijayaraghavan
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Abinaya Sampath
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - David W. Flaherty
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| |
Collapse
|
4
|
Ashraf M, Ahmad MS, Inomata Y, Ullah N, Tahir MN, Kida T. Transition metal nanoparticles as nanocatalysts for Suzuki, Heck and Sonogashira cross-coupling reactions. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
5
|
Jiang Y, Jenjob R, Yang SG. Enhanced Therapeutic Potential of Irreversible Electroporation under Combination with Gold-Doped Mesoporous Silica Nanoparticles against EMT-6 Breast Cancer Cells. BIOSENSORS 2022; 13:41. [PMID: 36671876 PMCID: PMC9855861 DOI: 10.3390/bios13010041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/07/2022] [Accepted: 12/23/2022] [Indexed: 06/17/2023]
Abstract
Irreversible electroporation (IRE) is a non-thermal tumor ablation technique that delivers short pulses of strong electric fields to cancer tissues and induces cell death through the destruction of cell membranes. Here, we synthesized gold-doped mesoporous silica nanoparticles (Au-MSNs) via incipient wetness impregnation and evaluated the therapeutic potentials of combination therapy with IRE. The fabricated Au-MSNs had around 80-100 nm of particle size and were successfully end-doped with Au nanoparticles. Combination treatment of IRE (800 V/cm) and Au-MSNs (100 μg/mL) increased cell membrane permeability by 25-fold compared with single IRE treatment. Cellular reactive oxygen species (ROS) and lipid peroxidation of EMT-6 cells were significantly increased by 14- and 265-fold, respectively, under combination treatment of IRE (800 V/cm) and Au-MSNs (100 µg/mL). Cytotoxic cell death increased by 28% under a combination treatment of IRE (800 V/cm) and Au-MSNs (100 ug/mL) over single IRE. Our studies suggest that the combination treatment of IRE with Au-MSNs can enhance the therapeutic efficacy of IRE for breast cancer.
Collapse
Affiliation(s)
| | | | - Su-Geun Yang
- Correspondence: ; Tel.: +82-32-890-2832; Fax: +82-32-890-1199
| |
Collapse
|
6
|
Optimizing the shape anisotropy of gold nanoparticles for enhanced light harvesting and photocatalytic applications. Photochem Photobiol Sci 2022; 22:773-781. [PMID: 36508140 DOI: 10.1007/s43630-022-00351-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/25/2022] [Indexed: 12/14/2022]
Abstract
AbstractHybrid nanoparticles (NP) of bismutite nanodisks (BSC ND) with gold nanoparticles (Au NP) of different aspect ratios (AR), such as spheres, rods and etched rods were synthesized via a facile sonochemical method. To better control the shapes of Au NP deposited on the substrate, these were pre-synthesized prior to the deposition using a modified seed mediated growth method by altering the pH and supersaturation of the growth solution. The shift in the peak position and shape of the localized surface plasmon resonance (LSPR) absorption band associated with fine-tuning of the shape of Au NP, led to enhanced light harvesting capabilities of the hybrid. Introducing shape anisotropy in the NP brought about narrowing of bandgap and lowering of PL intensity in the hybrids, suggesting better electronic contact of the NP with BSC, and effective suppression of recombination effects. Hybrids of BSC with Au nanorods showed 14% improved degradation of methylene blue (MB) dye compared to the hybrids with nanospheres. With this study, we provide a novel promising strategy to maximize the light harvesting capacity of semiconductors by tailoring the AR of Au NP, for improved solar to chemical energy conversion.
Graphical abstract
Collapse
|
7
|
Using Ammonia Solution to Fabricate Highly Active Au/Uncalcined TS‑1 Catalyst for Gas-phase Epoxidation of Propylene. J Catal 2022. [DOI: 10.1016/j.jcat.2022.11.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
8
|
Nagpure AS, Gogoi P, Chilukuri SV. Active and Recyclable Gold Metal Nanoparticles Catalyst Supported on Nitrogen-Doped Mesoporous Carbon for Chemoselective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol. Chem Asian J 2021; 16:2702-2722. [PMID: 34339087 DOI: 10.1002/asia.202100552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/19/2021] [Indexed: 12/30/2022]
Abstract
Several supported gold metal catalysts with different Au nanoparticles sizes were prepared and evaluated for the chemoselective hydrogenation of cinnamaldehyde (CA) to cinnamyl alcohol (CAL). To investigate the structure-activity relationship, stability of catalyst, heterogeneity and recyclability, the structural characteristics of materials and Au catalysts (fresh and spent catalysts) were studied by employing variety of physico-chemical techniques. The interrelationship among Au nanoparticles size (nm) with turnover frequency (h-1 ) of Au catalysts has also been explored. Among the various Au catalysts tested, nitrogen-doped mesoporous carbon (NMC) supported Au catalyst having homogeneously dispersed (78.8%) Au nanoparticles (1.6 nm) synthesized by sol-immobilization method (Au-NMC-SI) demonstrated improved catalytic activity affording 78% CAL selectivity and 94.2% CA conversion without using any promoter. Moreover, Au-NMC-SI catalyst exhibited good recyclability and stability. The catalyst synthesis approach described in this investigation opens up a novel strategy for the design of highly efficient metal nano-catalysts supported on NMC materials.
Collapse
Affiliation(s)
- Atul S Nagpure
- Department of Chemistry Rashtrapita Mahatma Gandhi Arts & Science College, Gondwana University, Gadchiroli), Nagbhid, Dist-Chandrapur, Maharashtra, 441205, India.,Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Pranjal Gogoi
- Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, 201002, Uttar Pradesh, India
| | - Satyanarayana V Chilukuri
- Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| |
Collapse
|
9
|
Zhang L, Li X, Lu J, Zhang L, Hu S, Gong H, Liu X, Mao B, Zhu X, Liu Z, Yang W. In situ Dispersed Nano-Au on Zr-Suboxides as Active Cathode for Direct CO 2 Electroreduction in Solid Oxide Electrolysis Cells. NANO LETTERS 2021; 21:6952-6959. [PMID: 34355915 DOI: 10.1021/acs.nanolett.1c02227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
CO2 electrochemical reduction in solid oxide electrolysis cells is an effective way to combine CO2 conversion and renewable electricity storage. A Au layer is often used as a current collector, whereas Au nanoparticles are rarely used as a cathode because it is difficult to keep nanosized Au at high temperatures. Here we dispersed a Au layer into Au nanoparticles (down to 2 nm) at 800 °C by applying high voltages. A 75-fold decrease in the polarization resistance was observed, accompanied by a 38-fold improvement in the cell current density. Combining electronic microscopy, in situ near-ambient pressure X-ray photoelectron spectroscopy, and theoretical calculations, we found that the interface between the Au layer and the electrolyte (yttria-stabilized zirconia (YSZ)) was reconstructed into nano-Au/Zr-suboxide interfaces, which are active sites that show a much lower reaction activation energy than that of the Au/YSZ interface. The formation of Zr-suboxides promotes Au dispersion and Au nanoparticle stabilization due to the strong interaction between Au and Zr-suboxides.
Collapse
Affiliation(s)
- Lixiao Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaobao Li
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianmin Lu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Liming Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiqing Hu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huimin Gong
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xuan Liu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Baohua Mao
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xuefeng Zhu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi Liu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- ShanghaiTech University, 393 Huaxia ZhongRoad, Shanghai 201210, China
| | - Weishen Yang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
10
|
Adams JS, Kromer ML, Rodríguez-López J, Flaherty DW. Unifying Concepts in Electro- and Thermocatalysis toward Hydrogen Peroxide Production. J Am Chem Soc 2021; 143:7940-7957. [PMID: 34019397 DOI: 10.1021/jacs.0c13399] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We examine relationships between H2O2 and H2O formation on metal nanoparticles by the electrochemical oxygen reduction reaction (ORR) and the thermochemical direct synthesis of H2O2. The similar mechanisms of such reactions suggest that these catalysts should exhibit similar reaction rates and selectivities at equivalent electrochemical potentials (μ̅i), determined by reactant activities, electrode potential, and temperature. We quantitatively compare the kinetic parameters for 12 nanoparticle catalysts obtained in a thermocatalytic fixed-bed reactor and a ring-disk electrode cell. Koutecky-Levich and Butler-Volmer analyses yield electrochemical rate constants and transfer coefficients, which informed mixed-potential models that treat each nanoparticle as a short-circuited electrochemical cell. These models require that the hydrogen oxidation reaction (HOR) and ORR occur at equal rates to conserve the charge on nanoparticles. These kinetic relationships predict that nanoparticle catalysts operate at potentials that depend on reactant activities (H2, O2), H2O2 selectivity, and rate constants for the HOR and ORR, as confirmed by measurements of the operating potential during the direct synthesis of H2O2. The selectivities and rates of H2O2 formation during thermocatalysis and electrocatalysis correlate across all catalysts when operating at equivalent μ̅i values. This analysis provides quantitative relationships that guide the optimization of H2O2 formation rates and selectivities. Catalysts achieve the greatest H2O2 selectivities when they operate at high H atom coverages, low temperatures, and potentials that maximize electron transfer toward stable OOH* and H2O2* while preventing excessive occupation of O-O antibonding states that lead to H2O formation. These findings guide the design and operation of catalysts that maximize H2O2 formation, and these concepts may inform other liquid-phase chemistries.
Collapse
Affiliation(s)
- Jason S Adams
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Matthew L Kromer
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Joaquín Rodríguez-López
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - David W Flaherty
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| |
Collapse
|
11
|
Catalytic Conversion of n-C 7 Asphaltenes and Resins II into Hydrogen Using CeO 2-Based Nanocatalysts. NANOMATERIALS 2021; 11:nano11051301. [PMID: 34069187 PMCID: PMC8156694 DOI: 10.3390/nano11051301] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/20/2021] [Accepted: 04/24/2021] [Indexed: 01/31/2023]
Abstract
This study focuses on evaluating the volumetric hydrogen content in the gaseous mixture released from the steam catalytic gasification of n-C7 asphaltenes and resins II at low temperatures (<230 °C). For this purpose, four nanocatalysts were selected: CeO2, CeO2 functionalized with Ni-Pd, Fe-Pd, and Co-Pd. The catalytic capacity was measured by non-isothermal (from 100 to 600 °C) and isothermal (220 °C) thermogravimetric analyses. The samples show the main decomposition peak between 200 and 230 °C for bi-elemental nanocatalysts and 300 °C for the CeO2 support, leading to reductions up to 50% in comparison with the samples in the absence of nanoparticles. At 220 °C, the conversion of both fractions increases in the order CeO2 < Fe-Pd < Co-Pd < Ni-Pd. Hydrogen release was quantified for the isothermal tests. The hydrogen production agrees with each material’s catalytic activity for decomposing both fractions at the evaluated conditions. CeNi1Pd1 showed the highest performance among the other three samples and led to the highest hydrogen production in the effluent gas with values of ~44 vol%. When the samples were heated at higher temperatures (i.e., 230 °C), H2 production increased up to 55 vol% during catalyzed n-C7 asphaltene and resin conversion, indicating an increase of up to 70% in comparison with the non-catalyzed systems at the same temperature conditions.
Collapse
|
12
|
Synthesis and Characterization of Pd-Ni Bimetallic Nanoparticles as Efficient Adsorbent for the Removal of Acid Orange 8 Present in Wastewater. WATER 2021. [DOI: 10.3390/w13081095] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this study palladium-nickel (Pd-Ni) nanoparticles supported on carbon and cerium oxide (Pd-Ni/AC-CeO2) were synthesized by a transfer phase method and characterized by scanning electronic microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX). The XRD and SEM data concluded the presence of alloy formation between Pd and Ni. The synthesized particles were used as an adsorbent for removal of azo dye acid orange-8 (AO-8) from water and were found to be effective in removal (over 90% removal efficiency) of the selected dye. Different kinetics and equilibrium models were applied to calculate the adsorption parameters. The most suitable model that best fitted the equilibrium data was the Langmuir model and maximum adsorption capacities were 666.6, 714 and 769 mg/g at 293, 313 and 333 K, respectively, with R2 values closed to 1 while in the case of the kinetics data the best fit was obtained with a pseudo-second order kinetics model with a high R2 value. Furthermore, the adsorption thermodynamics parameters such as free energy, enthalpy, and entropy were calculated and the adsorption process was to found be exothermic with a value of ΔH° (−7.593 kJ mol−1), spontaneous as ΔG° values were negative (−18.7327, −19.4870, and −20.584 kJ/mol at 293, 313 and 333 K, respectively). A positive entropy change ΔS° with a value of 0.0384 kJ /mol K indicates increased disorder at the solid–solution interface during the adsorption process. An attempt was made to recycle the Pd-Ni/AC-CeO2 with suitable solvents and the recycled adsorbent was reused for 6 cycles with AO-8 removal efficiency up to 80%. Based on findings of the study, the synthesized adsorbent could effectively be used for the removal of other pollutants from wastewater, however, further studies are needed to prove the mechanisms.
Collapse
|
13
|
Kao KC, Yang AC, Huang W, Zhou C, Goodman ED, Holm A, Frank CW, Cargnello M. A General Approach for Monolayer Adsorption of High Weight Loadings of Uniform Nanocrystals on Oxide Supports. Angew Chem Int Ed Engl 2021; 60:7971-7979. [PMID: 33403788 DOI: 10.1002/anie.202017238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Indexed: 11/07/2022]
Abstract
Monodispersed metal and semiconductor nanocrystals have attracted great attention in fundamental and applied research due to their tunable size, morphology, and well-defined chemical composition. Utilizing these nanocrystals in a controllable way is highly desirable especially when using them as building blocks for the preparation of nanostructured materials. Their deposition onto oxide materials provide them with wide applicability in many areas, including catalysis. However, so far deposition methods are limited and do not provide control to achieve high particle loadings. This study demonstrates a general approach for the deposition of hydrophobic ligand-stabilized nanocrystals on hydrophilic oxide supports without ligand-exchange. Surface functionalization of the supports with primary amine groups either using an organosilane ((3-aminopropyl)trimethoxysilane) or bonding with aminoalcohols (3-amino-1,2-propanediol) were found to significantly improve the interaction between nanocrystals and supports achieving high loadings (>10 wt. %). The bonding method with aminoalcohols guarantees the opportunity to remove the binding molecules thus allowing clean metal/oxide materials to be obtained, which is of great importance in the preparation of supported nanocrystals for heterogeneous catalysis.
Collapse
Affiliation(s)
- Kun-Che Kao
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - An-Chih Yang
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Weixin Huang
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Chengshuang Zhou
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Emmett D Goodman
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Alexander Holm
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Curtis W Frank
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| | - Matteo Cargnello
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94304, USA
| |
Collapse
|
14
|
Kao K, Yang A, Huang W, Zhou C, Goodman ED, Holm A, Frank CW, Cargnello M. A General Approach for Monolayer Adsorption of High Weight Loadings of Uniform Nanocrystals on Oxide Supports. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202017238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kun‐Che Kao
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - An‐Chih Yang
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Weixin Huang
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Chengshuang Zhou
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Emmett D. Goodman
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Alexander Holm
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Curtis W. Frank
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| | - Matteo Cargnello
- Department of Chemical Engineering Stanford University Stanford CA 94304 USA
| |
Collapse
|
15
|
Zhu B, Zhang LY, Liu JL, Zhang XM, Li XS, Zhu AM. TiO 2-supported Au-Ag plasmonic nanocatalysts achieved by plasma restructuring and activation. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123508. [PMID: 32721641 DOI: 10.1016/j.jhazmat.2020.123508] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 06/29/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
Plasmonic Au-Ag/TiO2 bimetallic nanocatalyst is regarded as a promising visible-light (VL) photocatalyst due to its wide light absorption and potentially enhanced activity. For its preparation, Au precursors usually contain Cl and co-impregnation/co-deposition suffers from AgCl precipitation, and consequently Au and Ag have to be sequentially supported. However, Au and Ag species of the sequential preparation are individually isolated and difficult to be homogeneously mixed. Here we report an Au-Ag plasmonic nanocatalyst achieved by plasma restructuring and activation from the sequential preparation. The isolated cationic Au and Ag species on the sequentially-prepared Au-Ag/TiO2 sample are restructured to be homogeneously mixed and highly activated by O2 plasma, which can be partially auto-reduced to Au-Ag bimetallic nanoparticles within the induction period of a few minutes in VL photocatalytic oxidation of CO. The Au-Ag plasmonic nanocatalyst exhibits a strongly enhanced activity in the VL photocatalytic reaction. The contribution of O2 plasma treatment and the enhancement mechanism for the Au-Ag plasmonic nanocatalyst are disclosed.
Collapse
Affiliation(s)
- Bin Zhu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Lu-Yao Zhang
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Jing-Lin Liu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, 116026, China; Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Xiao-Min Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Xiao-Song Li
- Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Ai-Min Zhu
- Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian, 116024, China.
| |
Collapse
|
16
|
TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions. WATER 2020. [DOI: 10.3390/w13010019] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This work highlights new insights into the performance of TiO2 doped with noble metal catalysts for the photocatalytic degradation of organic water pollutants. Different samples of titanium dioxide doped with noble metals (Au and Pd) were successfully synthesized via incipient wet impregnation (IWI) and ultrasound-assisted impregnation (US) methods. X-ray diffraction, scanning electron microscopy and UV-Vis reflectance spectroscopy were used for the characterization of the obtained materials. Their photocatalytic efficiency was investigated in aqueous suspension thorough a series of laboratory tests performed under ultraviolet (UV-A) irradiation conditions using 2,4 dinitrophenol (2,4 DNP) as a target molecule. The results clearly show that the method used for the catalyst synthesis affects its photocatalytic activity. It was found that the samples prepared by the IWI method exhibited high photocatalytic activity, and the removal rate obtained with TiO2-Pd/IWI was higher than that found for TiO2-Au/IWI. Furthermore, for the best catalyst, some extra photocatalytic experiments were conducted with rhodamine 6G (R6G), a highly stable molecule with a very different chemical structure to 2,4 DNP, in order to check the reactivity of this material. Moreover, the recycling experiments carried out with TiO2-Pd/IWI clearly demonstrated the high photocatalytic stability of this material for the degradation of 2,4 DNP. All of the collected data confirmed the interesting photocatalytic potential of the selected catalyst in the elimination of organic pollutants with no obvious change in its reactivity after four reaction cycles, which is very promising for promoting future applications in water depollution.
Collapse
|
17
|
Lu Z, Kunisch J, Gan Z, Bunian M, Wu T, Lei Y. Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation. ChemCatChem 2020. [DOI: 10.1002/cctc.202001053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zheng Lu
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Jacob Kunisch
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Zhuoran Gan
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Muntaseer Bunian
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Tianpin Wu
- X-ray Science Division Argonne National Laboratory 9700 South Cass Avenue Lemont IL 60439 USA
| | - Yu Lei
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| |
Collapse
|
18
|
|
19
|
Saxena R, Ukkandath Aravindakshan S, Uppaluri R, Qureshi M, De M. Supported palladium nanoclusters: morphological modification towards enhancement of catalytic performance using surfactant-assisted metal deposition. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-019-01248-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
20
|
Dong SH, Wang AL, Zhao J, Tan SJ, Wang B. Interaction of CO and O 2 with supported Pt single-atoms on TiO 2(110). CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp1911198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Shi-hui Dong
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ao-lei Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Jin Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Shi-jing Tan
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Bing Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| |
Collapse
|
21
|
Sankar M, He Q, Engel RV, Sainna MA, Logsdail AJ, Roldan A, Willock DJ, Agarwal N, Kiely CJ, Hutchings GJ. Role of the Support in Gold-Containing Nanoparticles as Heterogeneous Catalysts. Chem Rev 2020; 120:3890-3938. [PMID: 32223178 PMCID: PMC7181275 DOI: 10.1021/acs.chemrev.9b00662] [Citation(s) in RCA: 153] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
![]()
In
this review, we discuss selected examples from recent literature
on the role of the support on directing the nanostructures of Au-based
monometallic and bimetallic nanoparticles. The role of support is
then discussed in relation to the catalytic properties of Au-based
monometallic and bimetallic nanoparticles using different gas phase
and liquid phase reactions. The reactions discussed include CO oxidation,
aerobic oxidation of monohydric and polyhydric alcohols, selective
hydrogenation of alkynes, hydrogenation of nitroaromatics, CO2 hydrogenation, C–C coupling, and methane oxidation.
Only studies where the role of support has been explicitly studied
in detail have been selected for discussion. However, the role of
support is also examined using examples of reactions involving unsupported
metal nanoparticles (i.e., colloidal nanoparticles). It is clear that
the support functionality can play a crucial role in tuning the catalytic
activity that is observed and that advanced theory and characterization
add greatly to our understanding of these fascinating catalysts.
Collapse
Affiliation(s)
| | - Qian He
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K.,Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575
| | - Rebecca V Engel
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Mala A Sainna
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Andrew J Logsdail
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Alberto Roldan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - David J Willock
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Nishtha Agarwal
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Christopher J Kiely
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K.,Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, Pennsylvania 18015-3195, United States
| | - Graham J Hutchings
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| |
Collapse
|
22
|
Gogoi P, Kanna N, Begum P, Deka RC, C. V. V S, Raja T. Controlling and Stabilization of Ru Nanoparticles by Tuning the Nitrogen Content of the Support for Enhanced H2 Production through Aqueous-Phase Reforming of Glycerol. ACS Catal 2019. [DOI: 10.1021/acscatal.9b04063] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pranjal Gogoi
- Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and inovative Research (AcSIR), Gaziabad 201002, Uttar Pradesh, India
| | - Narsimharao Kanna
- Hindustan Petroleum Green R & D Centre, Devangonthi, Bengaluru 560067, India
| | - Pakiza Begum
- Department of Chemical Sciences, Tezpur University, Tezpur 784028, Assam, India
| | - Ramesh C. Deka
- Department of Chemical Sciences, Tezpur University, Tezpur 784028, Assam, India
| | - Satyanarayana C. V. V
- Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Hindustan Petroleum Green R & D Centre, Devangonthi, Bengaluru 560067, India
- Academy of Scientific and inovative Research (AcSIR), Gaziabad 201002, Uttar Pradesh, India
| | - Thirumalaiswamy Raja
- Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and inovative Research (AcSIR), Gaziabad 201002, Uttar Pradesh, India
| |
Collapse
|
23
|
Upgrading of Extra-Heavy Crude Oils by Dispersed Injection of NiO-PdO/CeO 2±δ Nanocatalyst-Based Nanofluids in the Steam. NANOMATERIALS 2019; 9:nano9121755. [PMID: 31835515 PMCID: PMC6956154 DOI: 10.3390/nano9121755] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 11/27/2019] [Accepted: 12/03/2019] [Indexed: 02/03/2023]
Abstract
The main objective of this study is to evaluate the injection of a dispersed nanocatalyst-based nanofluid in a steam stream for in situ upgrading and oil recovery during a steam injection process. The nanocatalyst was selected through adsorption and thermogravimetric experiments. Two nanoparticles were proposed, ceria nanoparticles (CeO2±δ), with and without functionalization with nickel, and palladium oxides (CeNi0.89Pd1.1). Each one was employed for static tests of adsorption and subsequent decomposition using a model solution composed of n-C7 asphaltenes (A) and resins II (R) separately and for different R:A ratios of 2:8, 1:1, and 8:2. Then, a displacement test consisting of three main stages was successfully developed. At the beginning, steam was injected into the porous media at a temperature of 210 °C, the pore and overburden pressure were fixed at 150 and 800 psi, respectively, and the steam quality was 70%. This was followed by CeNi0.89Pd1.1 dispersed injection in the steam stream. Finally, the treatment was allowed to soak for 12 h, and the steam flooding was carried out again until no more oil production was observed. Among the most relevant results, functionalized nanoparticles achieved higher adsorption of both fractions as well as a lower decomposition temperature. The presence of resins did not affect the amount of asphaltene adsorption over the evaluated materials. The catalytic activity suggests that the increase in resin content promotes a higher conversion in a shorter period of time. Also, for the different steps of the dynamic test, increases of 25% and 42% in oil recovery were obtained for the dispersed injection of the nanofluid in the steam stream and after a soaking time of 12 h, compared with the base curve with only steam injection, respectively. The upgraded crude oil reached an API gravity level of 15.9°, i.e., an increase in 9.0° units in comparison with the untreated extra-heavy crude oil, which represents an increase of 130%. Also, reductions of up to 71% and 85% in the asphaltene content and viscosity were observed.
Collapse
|
24
|
Zhang J, Di L, Yu F, Duan D, Zhang X. Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas. NANOMATERIALS 2018; 8:nano8090742. [PMID: 30235799 PMCID: PMC6164799 DOI: 10.3390/nano8090742] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 08/31/2018] [Accepted: 09/17/2018] [Indexed: 12/01/2022]
Abstract
Commercial TiO2 (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O2P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H2P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H2P is ascribed to the lower concentration of [O]s species. 100% CO conversion temperatures for Au/P25-O2P is 40 °C, which is 30 °C lower than that over the as-prepared Au/P25-As catalyst. The excellent CO oxidation activity over Au/P25-O2P is mainly attributed to the efficient decomposition of gold precursor species, small size of gold nanoparticles, and the high concentration of [O]s species.
Collapse
Affiliation(s)
- Jingsen Zhang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Lanbo Di
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Feng Yu
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China.
| | - Dongzhi Duan
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Xiuling Zhang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| |
Collapse
|
25
|
Ag-carried CMC/functional copolymer/ODA-Mt wLED-treated NC and their responses to brain cancer cells. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 92:463-476. [PMID: 30184772 DOI: 10.1016/j.msec.2018.05.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 04/17/2018] [Accepted: 05/08/2018] [Indexed: 11/20/2022]
Abstract
The subject of this work is synthesis and characterization of novel multifunctional nanocomposite (8/2A-NC) consisting (1) carboxymethyl cellulose (CMC) as a matrix biopolymer and poly (maleic acid-alt-acrylic acid) as a reactive synthetic partner matrix polymer; (2) octadecyl amine montmorillonite (ODA-MMT) reactive organoclay provide intercalated silicate layers structures and aqueous colloidal dispersing medium, and MMT as carriers and targeting agents for anticancer agents in drug delivery systems, respectively. ODA as a intercalated surfactant finely dispersed 8/2A NC and its compatibility with matrix polymers via the interfacial polarization (complexing) and functionalization of matrix polymers by amine (ODA) and carboxylic acids from both the CMC and copolymer; (3) silver nanoparticles (AgNPs) as in-situ generated onto matrix polymers with unique nano-size and morphology parameters was synthesized. Important material science and bioengineering aspects of these investigations included (a) novel approach in synthetic pathways; (b) effects of physical and chemical structural rearrangements; (c) effects of Light Emitting Dioda (LED)-treatment on the FT-IR spectra, XRD reflection parameters, SEM-TEM morphology and nano-size and diameter distribution of AgNPs onto matrix polymers; (d) positive effect of LED-treatment of 8/2A nanocomposite and its response to the MIAPaCa-2 and U87 human brain cancer cell lines were evaluated. Novel 8/2A-NC multifunctional drug consisting unique positive, intercalating and encapsulated core-shell morphology structures, nano-size (5.6 nm) and narrow diameter distribution (94%) of AgNPs onto matrix polymers [silver NPs (0.25%) in 8/2A NC (25%)] with highest volume of contact area compared with used cancer micro-cells show lowest cell viability as an excellent anticancer platform. 8/2A-NC is a novel multifunctional drug with intercalating and encapsulated core-shell morphology structures consisting of positively charged, non-randomly distributed AgNPs with a large contact area and low diameters (5-6 nm). The anticancer properties of (This factor is not conformed experimentally in work) this drug can be explained by the following structural factors: 8/2A-NC contains a combination of active sites from protonated hydroxyl, carboxyl and amine groups; Ag+-cations and ODA-MMT with high physical and chemical surface areas. We suggest this material be further explored for anti-cancer testing.
Collapse
|
26
|
Chong S, Yang TCK. Optimization of the photo-deposition parameters for carbon monoxide oxidation over gold–titania. CHEM ENG COMMUN 2018. [DOI: 10.1080/00986445.2017.1412308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Siewhui Chong
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Selangor, Malaysia
| | - Thomas Chung-Kuang Yang
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei City, Taiwan, R.O.C
| |
Collapse
|
27
|
Donoeva B, de Jongh PE. Colloidal Au Catalyst Preparation: Selective Removal of Polyvinylpyrrolidone from Active Au Sites. ChemCatChem 2018; 10:989-997. [PMID: 29610627 PMCID: PMC5873436 DOI: 10.1002/cctc.201701760] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Revised: 12/12/2017] [Indexed: 12/21/2022]
Abstract
Colloids with controlled dimensions, morphology and composition can be used to obtain supported metal catalysts with desired characteristics. Yet, removal of capping agents which block active metal sites in such catalysts can be challenging: mild methods often result in incomplete removal of capping agents, whereas harsher methods can cause change in particle size or morphology or cause metal segregation for bimetallic particles. Here we provide evidence that polyvinylpyrrolidone used as a stabilizing agent for gold colloids is present both on the metal and the support surface after colloid deposition on the TiO2 support. The polymer adsorbed on Au sites blocks their catalytic activity if it cannot be desorbed/decomposed under reaction conditions. Polyvinylpyrrolidone can be removed completely from the active gold surface of Au/TiO2 without particle growth using a number of mild treatment methods described in this work, despite only partial removal (≈45 %) of the stabilizer from the bulk of Au/TiO2 can be achieved. The remaining >50 % of polyvinylpyrrolidone resides exclusively on the TiO2 support and has no effect on the optical properties and catalytic activity of gold nanoparticles. The treated catalysts demonstrate catalytic activity and selectivity similar to those of a catalyst prepared by impregnation. These findings are important for further advancing the preparation of well‐defined supported catalysts using metal colloids.
Collapse
Affiliation(s)
- Baira Donoeva
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science Utrecht University Universiteitweg 993584 Utrecht The Netherlands
| | - Petra E de Jongh
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science Utrecht University Universiteitweg 993584 Utrecht The Netherlands
| |
Collapse
|
28
|
Effect of titania surface modification of mesoporous silica SBA-15 supported Au catalysts: Activity and stability in the CO oxidation reaction. J Catal 2017. [DOI: 10.1016/j.jcat.2017.09.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
29
|
Bryant K, Ibrahim G, Saunders SR. Switchable Surfactants for the Preparation of Monodisperse, Supported Nanoparticle Catalysts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12982-12988. [PMID: 29058909 DOI: 10.1021/acs.langmuir.7b02983] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Synthesis methods for the preparation of monodisperse, supported nanoparticles remain problematic. Traditional synthesis methods require calcination following nanoparticle deposition to remove bound ligands and expose catalytic active sites. Calcination leads to significant and unpredictable growth of the nanoparticles resulting in polydisperse size populations. This undesired increase in nanoparticle size leads to a decrease in catalytic activity due to a loss of total surface area. In this work, we present the use of silylamines, a class of switchable solvents, for the preparation of monodisperse, supported nanoparticles. Silylamines are switchable molecules that convert between molecular and ionic forms by reaction with CO2. Upon addition of an alkane, the switchable solvent behaves as a switchable surfactant (SwiS). The SwiS is used to template nanoparticles to aid in synthesis and subsequently used to release nanoparticles for deposition onto a support material. The use of SwiS allowed for the preservation of nanoparticle diameter throughout the deposition process. Finally, it is demonstrated that supported gold nanoparticle catalysts prepared using SwiS are up to 300% more active in the hydrogenation of 4-nitrophenol than their traditionally prepared analogues.
Collapse
Affiliation(s)
- Kristin Bryant
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University , Pullman, Washington 99164, United States
| | - Gasim Ibrahim
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University , Pullman, Washington 99164, United States
| | - Steven R Saunders
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University , Pullman, Washington 99164, United States
| |
Collapse
|
30
|
Masoud N, Delannoy L, Schaink H, van der Eerden A, de Rijk JW, Silva TAG, Banerjee D, Meeldijk JD, de Jong KP, Louis C, de Jongh PE. Superior Stability of Au/SiO 2 Compared to Au/TiO 2 Catalysts for the Selective Hydrogenation of Butadiene. ACS Catal 2017; 7:5594-5603. [PMID: 28944089 PMCID: PMC5601997 DOI: 10.1021/acscatal.7b01424] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/14/2017] [Indexed: 11/29/2022]
Abstract
Supported gold nanoparticles are highly selective catalysts for a range of both liquid-phase and gas-phase hydrogenation reactions. However, little is known about their stability during gas-phase catalysis and the influence of the support thereon. We report on the activity, selectivity, and stability of 2-4 nm Au nanoparticulate catalysts, supported on either TiO2 or SiO2, for the hydrogenation of 0.3% butadiene in the presence of 30% propene. Direct comparison of the stability of the Au catalysts was possible as they were prepared via the same method but on different supports. At full conversion of butadiene, only 0.1% of the propene was converted for both supported catalysts, demonstrating their high selectivity. The TiO2-supported catalysts showed a steady loss of activity, which was recovered by heating in air. We demonstrated that the deactivation was not caused by significant metal particle growth or strong metal-support interaction, but rather, it is related to the deposition of carbonaceous species under reaction conditions. In contrast, all the SiO2-supported catalysts were highly stable, with very limited formation of carbonaceous deposits. It shows that SiO2-supported catalysts, despite their 2-3 times lower initial activities, clearly outperform TiO2-supported catalysts within a day of run time.
Collapse
Affiliation(s)
- Nazila Masoud
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Laurent Delannoy
- Laboratoire
de Réactivité de Surface, Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 7197, 4 Place Jussieu, Case 178, F-75252 Paris, France
| | - Herrick Schaink
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Ad van der Eerden
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Jan Willem de Rijk
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Tiago A. G. Silva
- Laboratoire
de Réactivité de Surface, Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 7197, 4 Place Jussieu, Case 178, F-75252 Paris, France
| | - Dipanjan Banerjee
- Dutch−Belgian
Beamline (DUBBLE), ESRF-The European Synchrotron, CS40220, 38043 CEDEX 9 Grenoble, France
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, Box 2404, 3001 Leuven, Belgium
| | - Johannes D. Meeldijk
- Electron
Microscopy Facility, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Krijn P. de Jong
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Catherine Louis
- Laboratoire
de Réactivité de Surface, Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 7197, 4 Place Jussieu, Case 178, F-75252 Paris, France
| | - Petra E. de Jongh
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| |
Collapse
|
31
|
Murayama H, Hasegawa T, Yamamoto Y, Tone M, Kimura M, Ishida T, Honma T, Okumura M, Isogai A, Fujii T, Tokunaga M. Chloride-free and water-soluble Au complex for preparation of supported small nanoparticles by impregnation method. J Catal 2017. [DOI: 10.1016/j.jcat.2017.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
32
|
Arslan O, Uyar T. Multifunctional electrospun polymeric nanofibrous mats for catalytic reduction, photocatalysis and sensing. NANOSCALE 2017; 9:9606-9614. [PMID: 28665421 DOI: 10.1039/c7nr02658g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fabrication and decoration of flexible Nylon 6,6 polymeric nanofibrous mats for production of multifunctional electrospun material was accomplished via visible light-emitting surface-protected silicon quantum dots (Si QD), ZnO nanoparticles (ZnO NP) and Pd nanocubes (Pd NC). UV-range light was utilized for Si QD production and, after hydrolysis/condensation together with nucleation and growth reactions, amine-modified, fluorescent Si QD were obtained. Additionally, available molecular groups on the Si QD coated onto the polymeric nanofibrous mats provided further attachment of metal oxide and metal NP for various catalytic purposes. Analytical investigations showed that visible-light emission could be maintained on the Nylon 6,6 mats for trinitrotoluene (TNT) sensing. Also, due to consecutive NP decoration, multifunctional, polymeric, flexible nanofibrous mats were obtained. Experiments revealed that fabricated multifunctional mats could reduce molecules such as paranitrophenol effectively or decompose waste dyes such as methylene blue via photocatalytic experiments, and sense the pollutant TNT in aqueous solutions as an all-in-one concept.
Collapse
Affiliation(s)
- Osman Arslan
- Institute of Materials Science & Nanotechnology, UNAM-National Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
| | | |
Collapse
|
33
|
Miah AT, Bharadwaj SK, Saikia P. Surfactant free synthesis of gold nanoparticles within meso-channels of non-functionalized SBA-15 for its promising catalytic activity. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.04.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
34
|
In Situ Regeneration of Au Nanocatalysts by Atmospheric-Pressure Air Plasma: Regeneration Characteristics of Square-Wave Pulsed Plasma. Top Catal 2017. [DOI: 10.1007/s11244-017-0756-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
35
|
Deng XQ, Liu JL, Li XS, Zhu B, Zhu X, Zhu AM. Kinetic study on visible-light photocatalytic removal of formaldehyde from air over plasmonic Au/TiO 2. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.05.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
36
|
Xia Y, Chen W, Liang S, Bi J, Wu L, Wang X. Engineering a highly dispersed co-catalyst on a few-layered catalyst for efficient photocatalytic H2 evolution: a case study of Ni(OH)2/HNb3O8 nanocomposites. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01792h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni(OH)2 has been highly dispersed on HNb3O8 nanosheets and the composites exhibited greatly enhanced photocatalytic activity.
Collapse
Affiliation(s)
- Yuzhou Xia
- Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou University
- Fuzhou 350002
- People's Republic of China
| | - Weihang Chen
- Department of Environmental Science and Engineering
- Fuzhou University
- Minhou
- People's Republic of China
| | - Shijing Liang
- Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou University
- Fuzhou 350002
- People's Republic of China
- Department of Environmental Science and Engineering
| | - Jinhong Bi
- Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou University
- Fuzhou 350002
- People's Republic of China
- Department of Environmental Science and Engineering
| | - Ling Wu
- Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou University
- Fuzhou 350002
- People's Republic of China
| | - Xuxu Wang
- Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou University
- Fuzhou 350002
- People's Republic of China
| |
Collapse
|
37
|
Selective reduction of carbon dioxide to carbon monoxide over Au/CeO2 catalyst and identification of reaction intermediate. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(16)62538-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
38
|
Otto T, Zones SI, Iglesia E. Challenges and strategies in the encapsulation and stabilization of monodisperse Au clusters within zeolites. J Catal 2016. [DOI: 10.1016/j.jcat.2016.04.015] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
39
|
Liu H, Lin Y, Ma Z. Au/LaPO4 nanowires: Synthesis, characterization, and catalytic CO oxidation. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2016.01.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
40
|
Lavergne MA, Chanéac C, Portehault D, Cassaignon S, Durupthy O. Optimized Design of Pt-Doped Bi2WO6Nanoparticle Synthesis for Enhanced Photocatalytic Properties. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501208] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
41
|
Zeng W, Tang J, Wang P, Pei Y. Density functional theory (DFT) studies of CO oxidation reaction on M13 and Au18M clusters (M = Au, Ag, Cu, Pt and Pd): the role of co-adsorbed CO molecule. RSC Adv 2016. [DOI: 10.1039/c6ra07566e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Using the icosahedra M13 (M = Au, Ag, Cu, Pt, Pd) and heteroatom doped Au18M clusters as model systems, the role of the co-adsorbed CO molecule played in the CO oxidation reaction is explored on the basis of density functional theory (DFT) calculations.
Collapse
Affiliation(s)
- Wenping Zeng
- Department of Chemistry
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- Xiangtan University
- P. R. China
| | - Jian Tang
- Hunan Key Laboratory for Computation and Simulation in Science and Engineering
- Institute for Computational and Applied Mathematics
- Xiangtan University
- Xiangtan 411105
- China
| | - Pu Wang
- Department of Chemistry
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- Xiangtan University
- P. R. China
| | - Yong Pei
- Department of Chemistry
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- Xiangtan University
- P. R. China
| |
Collapse
|
42
|
Villa A, Dimitratos N, Chan-Thaw CE, Hammond C, Veith GM, Wang D, Manzoli M, Prati L, Hutchings GJ. Characterisation of gold catalysts. Chem Soc Rev 2016; 45:4953-94. [DOI: 10.1039/c5cs00350d] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Au-based catalysts have established a new important field of catalysis, revealing specific properties in terms of both high activity and selectivity for many reactions.
Collapse
Affiliation(s)
- Alberto Villa
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
| | | | | | | | - Gabriel M. Veith
- Materials Science and Technology Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Di Wang
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility Karlsruhe Institute of Technology (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Maela Manzoli
- Dipartimento di Chimica
- Università degli Studi di Torino
- Torino
- Italy
| | - Laura Prati
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
| | | |
Collapse
|
43
|
Fernández JL, Imaduwage KP, Zoski CG. Carbon Supported Noble Metal (Pd and Au) Catalysts Synthesized by an Oxide Route with High Performance for Oxygen Reduction in Acidic Media. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.08.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
44
|
The action of VOx doping on Au/CeO2 catalysts for CO oxidation and water–gas shift reaction. REACTION KINETICS MECHANISMS AND CATALYSIS 2015. [DOI: 10.1007/s11144-015-0921-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
45
|
H2O2 direct synthesis under mild conditions on Pd–Au samples: Effect of the morphology and of the composition of the metallic phase. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.01.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
46
|
Gao W, Sivaramakrishnan S, Wen J, Zuo JM. Direct observation of interfacial Au atoms on TiO₂ in three dimensions. NANO LETTERS 2015; 15:2548-2554. [PMID: 25761226 DOI: 10.1021/acs.nanolett.5b00682] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Interfacial atoms, which result from interactions between the metal nanoparticles and support, have a large impact on the physical and chemical properties of nanoparticles. However, they are difficult to observe; the lack of knowledge has been a major obstacle toward unraveling their role in chemical transformations. Here we report conclusive evidence of interfacial Au atoms formed on the rutile (TiO2) (110) surfaces by activation using high-temperature (∼500 °C) annealing in air. Three-dimensional imaging was performed using depth-sectioning enabled by aberration-corrected scanning transmission electron microscopy. Results show that the interface between Au nanocrystals and TiO2 (110) surfaces consists of a single atomic layer with Au atoms embedded inside Ti-O. The number of interfacial Au atoms is estimated from ∼1-8 in an interfacial atomic column. Direct impact of interfacial Au atoms is observed on an enhanced Au-TiO2 interaction and the reduction of surface TiO2; both are critical to Au catalysis.
Collapse
Affiliation(s)
- Wenpei Gao
- †Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
- ‡Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Shankar Sivaramakrishnan
- †Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
- ‡Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Jianguo Wen
- ‡Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Jian-Min Zuo
- †Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
- ‡Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801, United States
| |
Collapse
|
47
|
Adnan RH, Andersson GG, Polson MIJ, Metha GF, Golovko VB. Factors influencing the catalytic oxidation of benzyl alcohol using supported phosphine-capped gold nanoparticles. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01168f] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The nature of Au cluster precursor and activation treatments affect catalyst activity in aerobic benzyl alcohol oxidation.
Collapse
Affiliation(s)
- Rohul H. Adnan
- Department of Chemistry
- University of Canterbury
- Christchurch
- New Zealand
- Chemistry Department
| | - Gunther G. Andersson
- Flinders Centre for Nanoscale Science and Technology
- Flinders University
- Adelaide
- Australia
| | | | | | - Vladimir B. Golovko
- Department of Chemistry
- University of Canterbury
- Christchurch
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
| |
Collapse
|
48
|
Meng N, Zhang S, Zhou Y, Nie W, Chen P. Novel synthesis of silver/reduced graphene oxide nanocomposite and its high catalytic activity towards hydrogenation of 4-nitrophenol. RSC Adv 2015. [DOI: 10.1039/c5ra13574e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ag/RGO nanocomposites were prepared via reducing AgNO3 in a macroscopic RGO aerogel directly through a convenient impregnation process, which exhibited high activity in the catalytic hydrogenation of 4-nitrophenol.
Collapse
Affiliation(s)
- Nannan Meng
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- College of Chemistry & Chemical Engineering
- Anhui University
- Hefei 230601
- China
| | - Shujie Zhang
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- College of Chemistry & Chemical Engineering
- Anhui University
- Hefei 230601
- China
| | - Yifeng Zhou
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- College of Chemistry & Chemical Engineering
- Anhui University
- Hefei 230601
- China
| | - Wangyan Nie
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- College of Chemistry & Chemical Engineering
- Anhui University
- Hefei 230601
- China
| | - Pengpeng Chen
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- College of Chemistry & Chemical Engineering
- Anhui University
- Hefei 230601
- China
| |
Collapse
|
49
|
Active palladium catalyst preparation for hydrogenation reactions of nitrobenzene, olefin and aldehyde derivatives. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.08.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
50
|
del Río E, Gaona D, Hernández-Garrido JC, Calvino JJ, Basallote MG, Fernández-Trujillo MJ, Pérez-Omil JA, Gatica JM. Speciation-controlled incipient wetness impregnation: A rational synthetic approach to prepare sub-nanosized and highly active ceria–zirconia supported gold catalysts. J Catal 2014. [DOI: 10.1016/j.jcat.2014.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|