1
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Yalcin O, Sourav S, Wachs IE. Design of Cr-Free Promoted Copper-Iron Oxide-Based High-Temperature Water-Gas Shift Catalysts. ACS Catal 2023; 13:12681-12691. [PMID: 37822859 PMCID: PMC10563126 DOI: 10.1021/acscatal.3c02474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/19/2023] [Indexed: 10/13/2023]
Abstract
The effect of Ce addition to the Cr-free Al-promoted Cu-Fe oxide-based catalysts is investigated. Catalyst characterization (X-ray diffraction (XRD), in situ Raman spectroscopy, high-sensitivity low-energy ion scattering (HS-LEIS), Brunauer-Emmett-Teller (BET) analysis), CO-temperature-programmed reduction chemical probing, and steady-state WGS activity reveal that (i) in the absence of Al, Ce addition via coprecipitation has a detrimental effect on the catalytic activity related to the poor thermostability and formation of less active Ce-Cu-O NPs, (ii) the addition of Ce via coprecipitation also does not improve the performance of the CuAlFe catalyst because of the formation of a thick CeOx overlayer on the active Cu-FeOx interface, and (iii) impregnation of Ce onto the CuAlFe catalyst exhibits significant improvement in catalytic performance due to the formation of a highly active CeOx-FeOx-Cu interfacial area. In summary, Al does not surface-segregate and serves as a structural promoter, while Ce and Cu surface-segregate and act as functional promoters in Ce/CuAlFe mixed oxide catalysts.
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Affiliation(s)
- Ozgen Yalcin
- College
of Engineering and Technology, American
University of the Middle East, Egaila 54200, Kuwait
| | - Sagar Sourav
- Operando
Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical
and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Israel E. Wachs
- Operando
Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical
and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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2
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Fine-tuning the active site terminal oxygen Mo=O of practical active phase via an isomorphous-substitution method for the reaction of isobutene to methacrolein. REACTION KINETICS MECHANISMS AND CATALYSIS 2022. [DOI: 10.1007/s11144-022-02332-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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3
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Afsharpour M, Amoee S. Porous biomorphic silica@ZnO nanohybrids as the effective photocatalysts under visible light. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:49784-49795. [PMID: 35218495 DOI: 10.1007/s11356-022-19377-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 02/19/2022] [Indexed: 06/14/2023]
Abstract
In this study, zinc oxide nanohybrids based on functionalized bio-silica were synthesized and used for the degradation of Congo red under visible light. Diatom was used as a Si natural source with hierarchical nanostructures to produce porous silica support. Functionalized porous silica is a good candidate for direct immobilization of metal oxide and therefore of interest as the catalyst. Here, six hybrids of functionalized bio-silica and ZnO were synthesized and characterized by FT-IR, XRD, SEM/EDX, BET/BJH, and UV-Vis spectroscopy. Then, the synthesized catalysts were subjected to degradation of different anionic azo dyes (Congo red, methyl orange, and methyl red) under visible light irradiation. The results show the decrease of band gap in bio-silica@ZnO hybrids which enhance the photocatalytic properties of hybrids due to the shifting to visible light adsorption. The best photocatalytic result of SiO2@ZnO hybrid was obtained from chitosan-based amino-functionalized silica due to the best functionalization, highest loading of ZnO, low band gap, and filling of diatom pores with functional groups.
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Affiliation(s)
- Maryam Afsharpour
- Chemistry & Chemical Engineering Research Center of Iran, 14335-186, Tehran, Iran.
| | - Somayeh Amoee
- Chemistry & Chemical Engineering Research Center of Iran, 14335-186, Tehran, Iran
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4
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Bao Z, Fung V, Polo-Garzon F, Hood ZD, Cao S, Chi M, Bai L, Jiang DE, Wu Z. The interplay between surface facet and reconstruction on isopropanol conversion over SrTiO3 nanocrystals. J Catal 2020. [DOI: 10.1016/j.jcat.2020.02.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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5
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Kiani D, Sourav S, Taifan W, Calatayud M, Tielens F, Wachs IE, Baltrusaitis J. Existence and Properties of Isolated Catalytic Sites on the Surface of β-Cristobalite-Supported, Doped Tungsten Oxide Catalysts (WOx/β-SiO2, Na-WOx/β-SiO2, Mn-WOx/β-SiO2) for Oxidative Coupling of Methane (OCM): A Combined Periodic DFT and Experimental Study. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05591] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniyal Kiani
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca
Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States
| | - Sagar Sourav
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca
Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States
| | - William Taifan
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca
Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States
| | - Monica Calatayud
- Sorbonne Université, CNRS, Laboratoire de Chimie Théorique, LCT, F-75005 Paris, France
| | - Frederik Tielens
- General Chemistry (ALGC)-Materials Modelling Group, Vrije Universiteit Brussel (Free University Brussels-VUB), Pleinlaan 2, 1050 Brussel, Belgium
| | - Israel E. Wachs
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca
Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States
| | - Jonas Baltrusaitis
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca
Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States
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6
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Kiani D, Sourav S, Wachs IE, Baltrusaitis J. Synthesis and molecular structure of model silica-supported tungsten oxide catalysts for oxidative coupling of methane (OCM). Catal Sci Technol 2020. [DOI: 10.1039/d0cy00289e] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Catalysts with only dispersed phase Na–WO4 sites where Na/W < 2 are slightly less active but significantly more C2 selective than the traditional Na2WO4/SiO2 catalysts that contain a crystalline phase where Na/W = 2.
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Affiliation(s)
- Daniyal Kiani
- Department of Chemical and Biomolecular Engineering
- Lehigh University
- Bethlehem
- USA
| | - Sagar Sourav
- Department of Chemical and Biomolecular Engineering
- Lehigh University
- Bethlehem
- USA
| | - Israel E. Wachs
- Department of Chemical and Biomolecular Engineering
- Lehigh University
- Bethlehem
- USA
| | - Jonas Baltrusaitis
- Department of Chemical and Biomolecular Engineering
- Lehigh University
- Bethlehem
- USA
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7
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Boruah B, Gupta R, Modak JM, Madras G. Enhanced photocatalysis and bacterial inhibition in Nb 2O 5 via versatile doping with metals (Sr, Y, Zr, and Ag): a critical assessment. NANOSCALE ADVANCES 2019; 1:2748-2760. [PMID: 36132720 PMCID: PMC9418613 DOI: 10.1039/c9na00305c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 05/30/2019] [Indexed: 05/18/2023]
Abstract
Unique optical properties render semiconductor Nb2O5 nanoparticles suitable for light harvesting and photocatalytic applications. This study focuses on determining optical properties such as the band gap, conduction band edge, valence band edge and work function of as-prepared solution combustion synthesized Nb2O5 nanoparticles with the help of UV-vis Diffuse Reflectance spectroscopy (DRS) and ultraviolet photoelectron spectroscopy (UPS) techniques. Phase purity and the oxidation states of the elements present in the material were confirmed from X-ray diffraction (XRD) patterns and X-ray photoelectron spectra (XPS), respectively. Doping semiconductors with different metal ions impacts the activity of the material, and therefore efforts were made to understand the effect on the photocatalytic performance of Nb2O5 due to the incorporation of metal dopants viz. Sr, Y, Zr, and Ag. Lattice parameters were obtained from Rietveld refinement of the XRD patterns. Parameters which are closely related to the photoactivity of the catalysts such as the presence of surface defects, oxygen vacancies, surface area, and charge carrier dynamics were determined from photoluminescence (PL) analysis, Brunauer-Emmett-Teller (BET) surface area measurements and time-resolved fluorescence (TRF) analysis respectively. In addition, the dopant concentrations were optimised for enhanced photocatalytic activity. The doped Nb2O5 nanoparticles showed significant activity towards targeted degradation of organic pollutants like 2-chlorophenol (2-CP) and dye contaminants like methylene blue (MB), orange G (OG) and indigo carmine (IC). This strategy yielded a robust response towards inactivation of E. coli and S. aureus as well. Adsorption and photodegradation of MB followed Lagergren's pseudo 1st order reaction model and the Langmuir Hinshelwood model respectively. Bacterial inactivation and OG, IC and 2-CP photodegradation followed 1st order kinetics. The reusability of the catalyst for 5 cycles was demonstrated. Finally, a plausible mechanism is proposed based on radical trapping experiments and combined analysis of the characterization techniques.
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Affiliation(s)
- Bhanupriya Boruah
- Department of Chemical Engineering, Indian Institute of Science Bangalore 560012 India +91 80 23600683 +91 80 22932321
| | - Rimzhim Gupta
- Department of Chemical Engineering, Indian Institute of Science Bangalore 560012 India +91 80 23600683 +91 80 22932321
| | - Jayant M Modak
- Department of Chemical Engineering, Indian Institute of Science Bangalore 560012 India +91 80 23600683 +91 80 22932321
| | - Giridhar Madras
- Department of Chemical Engineering, Indian Institute of Science Bangalore 560012 India +91 80 23600683 +91 80 22932321
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8
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9
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Yang W, Zhu G, Wang J, Feng S, Yang J, Su P, Fu W, Yang H. Preparation of NiO by Simple Heat Treatment Method and its Application in Photocatalytic Water Splitting. Catal Letters 2019. [DOI: 10.1007/s10562-019-02692-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Lakshmanareddy N, Navakoteswara Rao V, Cheralathan KK, Subramaniam EP, Shankar MV. Pt/TiO2 nanotube photocatalyst – Effect of synthesis methods on valance state of Pt and its influence on hydrogen production and dye degradation. J Colloid Interface Sci 2019; 538:83-98. [DOI: 10.1016/j.jcis.2018.11.077] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 11/06/2018] [Accepted: 11/19/2018] [Indexed: 01/16/2023]
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11
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Sun X, Mi Y, Jiao F, Xu X. Activating Layered Perovskite Compound Sr2TiO4 via La/N Codoping for Visible Light Photocatalytic Water Splitting. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00369] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaoqin Sun
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China
| | - Yongli Mi
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China
- The Hong Kong University of Science and Technology, Department of Chemical and Biomolecular Engineering, Kowloon, Hong Kong, People’s Republic of China
| | - Feng Jiao
- Center of Catalytic Science and Technology, Department and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Xiaoxiang Xu
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China
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12
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Chiang TH, Lyu H, Hisatomi T, Goto Y, Takata T, Katayama M, Minegishi T, Domen K. Efficient Photocatalytic Water Splitting Using Al-Doped SrTiO3 Coloaded with Molybdenum Oxide and Rhodium–Chromium Oxide. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04264] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Tzu Hsuan Chiang
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Department of Energy Engineering, National United University, Lienda, Nan-Shi Li, Miaoli 36006, Taiwan
| | - Hao Lyu
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takashi Hisatomi
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yosuke Goto
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tsuyoshi Takata
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Masao Katayama
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tsutomu Minegishi
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazunari Domen
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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13
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Foo GS, Hood ZD, Wu Z. Shape Effect Undermined by Surface Reconstruction: Ethanol Dehydrogenation over Shape-Controlled SrTiO3 Nanocrystals. ACS Catal 2017. [DOI: 10.1021/acscatal.7b03341] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guo Shiou Foo
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zachary D. Hood
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Zili Wu
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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14
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Zhang N, Li L, Li G. Nanosized amorphous tantalum oxide: a highly efficient photocatalyst for hydrogen evolution. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-3052-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Polo-Garzon F, Yang SZ, Fung V, Foo GS, Bickel EE, Chisholm MF, Jiang DE, Wu Z. Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts. Angew Chem Int Ed Engl 2017. [PMID: 28636790 DOI: 10.1002/anie.201704656] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Although perovskites have been widely used in catalysis, tuning of their surface termination to control reaction selectivity has not been well established. In this study, we employed multiple surface-sensitive techniques to characterize the surface termination (one aspect of surface reconstruction) of SrTiO3 (STO) after thermal pretreatment (Sr enrichment) and chemical etching (Ti enrichment). We show, by using the conversion of 2-propanol as a probe reaction, that the surface termination of STO can be controlled to greatly tune catalytic acid/base properties and consequently the reaction selectivity over a wide range, which is not possible with single-metal oxides, either SrO or TiO2 . Density functional theory (DFT) calculations explain well the selectivity tuning and reaction mechanism on STO with different surface termination. Similar catalytic tunability was also observed on BaZrO3 , thus highlighting the generality of the findings of this study.
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Affiliation(s)
- Felipe Polo-Garzon
- Chemical Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Shi-Ze Yang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Victor Fung
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Guo Shiou Foo
- Chemical Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Elizabeth E Bickel
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN, 38505, USA
| | - Matthew F Chisholm
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - De-En Jiang
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Zili Wu
- Chemical Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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16
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Polo‐Garzon F, Yang S, Fung V, Foo GS, Bickel EE, Chisholm MF, Jiang D, Wu Z. Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704656] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Felipe Polo‐Garzon
- Chemical Sciences Division and Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Shi‐Ze Yang
- Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Victor Fung
- Department of Chemistry University of California Riverside CA 92521 USA
| | - Guo Shiou Foo
- Chemical Sciences Division and Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Elizabeth E. Bickel
- Department of Chemical Engineering Tennessee Technological University Cookeville TN 38505 USA
| | - Matthew F. Chisholm
- Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - De‐en Jiang
- Department of Chemistry University of California Riverside CA 92521 USA
| | - Zili Wu
- Chemical Sciences Division and Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
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17
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Foo GS, Polo-Garzon F, Fung V, Jiang DE, Overbury SH, Wu Z. Acid–Base Reactivity of Perovskite Catalysts Probed via Conversion of 2-Propanol over Titanates and Zirconates. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00783] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Guo Shiou Foo
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak
Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Felipe Polo-Garzon
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak
Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Victor Fung
- Department
of Chemistry, University of California, Riverside, California 92521, United States
| | - De-en Jiang
- Department
of Chemistry, University of California, Riverside, California 92521, United States
| | - Steven H. Overbury
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak
Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zili Wu
- Chemical
Sciences Division and Center for Nanophase Materials Sciences, Oak
Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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18
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Fresno F, Jana P, Reñones P, Coronado JM, Serrano DP, de la Peña O'Shea VA. CO2 reduction over NaNbO3 and NaTaO3 perovskite photocatalysts. Photochem Photobiol Sci 2017; 16:17-23. [DOI: 10.1039/c6pp00235h] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both NaNbO3 and NaTaO3 exhibit interesting intrinsic photocatalytic activities for CO2 reduction in terms of conversion and selectivity.
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Affiliation(s)
- F. Fresno
- Photoactivated Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
| | - P. Jana
- Thermochemical Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
| | - P. Reñones
- Photoactivated Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
| | - J. M. Coronado
- Thermochemical Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
| | - D. P. Serrano
- Thermochemical Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
| | - V. A. de la Peña O'Shea
- Photoactivated Processes Unit
- IMDEA Energy Institute
- Móstoles Technology Park
- 28935 Móstoles
- Spain
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19
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Zhu M, Rocha TCR, Lunkenbein T, Knop-Gericke A, Schlögl R, Wachs IE. Promotion Mechanisms of Iron Oxide-Based High Temperature Water–Gas Shift Catalysts by Chromium and Copper. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00698] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Minghui Zhu
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Tulio C. R. Rocha
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Thomas Lunkenbein
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Axel Knop-Gericke
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Robert Schlögl
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Israel E. Wachs
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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20
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The impact of room temperature polymorphism in K doped NaTaO3 on structural phase transition behaviour. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.03.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Joo PH, Behtash M, Yang K. Energetic stability, oxidation states, and electronic structure of Bi-doped NaTaO3: a first-principles hybrid functional study. Phys Chem Chem Phys 2016; 18:857-65. [PMID: 26646215 DOI: 10.1039/c5cp05556c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We studied the defect formation energies, oxidation states of the dopants, and electronic structures of Bi-doped NaTaO3 using first-principles hybrid density functional theory calculations. Three possible structural models, including Bi-doped NaTaO3 with Bi at the Na site (Bi@Na), with Bi at the Ta site (Bi@Ta), and with Bi at both Na and Ta sites [Bi@(Na,Ta)], are constructed. Our results show that the preferred doping sites of Bi are strongly related to the preparation conditions of NaTaO3. It is energetically more favorable to form a Bi@Na structure under Na-poor conditions, to form a Bi@Ta structure under Na-rich conditions, and to form a Bi@(Na,Ta) structure under mildly Na-rich conditions. The Bi@Na doped model shows an n-type conducting character along with an expected blueshift of the optical absorption edge, in which the Bi atoms exist as Bi(3+) (6s(2)6p(0)). The Bi@Ta doped model has empty gap states consisting of Bi 6s states in its band gap, which can lead to visible-light absorption via the electron transition among the valence band, the conduction band, and the gap states. The Bi dopant is present as a Bi(5+) ion in this model, consistent with the experimental results. In contrast, the Bi@(Na,Ta) doped model has occupied gap states consisting of Bi 6s states in its band gap, and thus visible-light absorption is also expected in this system due to electron excitation from these occupied states to the conduction band, in which the Bi dopants exist as Bi(3+) ions. Our first-principles electronic structure calculations revealed the relationship between the Bi doping sites and the material preparation conditions, and clarified the oxidation states of Bi dopants in NaTaO3 as well as the origin of different visible-light photocatalytic hydrogen evolution behaviors in Bi@Ta and Bi@(Na,Ta) doped NaTaO3. This work can provide a useful reference for preparing a Bi-doped NaTaO3 photocatalyst with desired doping sites.
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Affiliation(s)
- Paul H Joo
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093-0448, USA.
| | - Maziar Behtash
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093-0448, USA.
| | - Kesong Yang
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093-0448, USA.
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22
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Zhou Y, Chen G, Yu Y, Zhao L, Yu Q, He Q. Effects of La-doping on charge separation behavior of ZnO:GaN for its enhanced photocatalytic performance. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01193k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this work, lanthanum (La) has been proven as an effective space charge layer modifier to promote efficient photogenerated charge carrier separation for ZnO:GaN solid solution photocatalysts with enhanced photocatalytic water-splitting performance.
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Affiliation(s)
- Yansong Zhou
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
| | - Gang Chen
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
| | - Yaoguang Yu
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
| | - Lichen Zhao
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
| | - Qilin Yu
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
| | - Qiang He
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- PR China
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23
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Song K, Yang J, Jiang P, Gao W, Cong R, Yang T. Ba2InTaO6- A Partially B-Site-Ordered Double Perovskite for Overall Water Splitting. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500929] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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24
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Li M, Tumuluri U, Wu Z, Dai S. Effect of Dopants on the Adsorption of Carbon Dioxide on Ceria Surfaces. CHEMSUSCHEM 2015; 8:3651-3660. [PMID: 26403156 DOI: 10.1002/cssc.201500899] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Indexed: 06/05/2023]
Abstract
High-surface-area nanosized CeO2 and M-doped CeO2 (M=Cu, La, Zr, and Mg) prepared by a surfactant-templated method were tested for CO2 adsorption. Cu, La, and Zr are doped into the lattice of CeO2, whereas Mg is dispersed on the CeO2 surface. The doping of Cu and La into CeO2 leads to an increase of the CO2 adsorption capacity, whereas the doping of Zr has little or no effect. The addition of Mg causes a decrease of the CO2 adsorption capacity at a low Mg content and a gradual increase at a higher content. The CO2 adsorption capacity follows the sequence Cu-CeO2 >La-CeO2 >Zr-CeO2 ≈CeO2 >Mg-CeO2 at low dopant contents, in line with the relative amount of defect sites in the samples. It is the defect sites on the surface, not in the bulk of CeO2, modified by the dopants that play the vital role in CO2 chemisorption. The role of surface oxygen vacancies is further supported by an in situ IR spectroscopic study of the surface chemistry during CO2 adsorption on the doped CeO2.
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Affiliation(s)
- Meijun Li
- Department of Chemistry, University of Tennessee, 1420 Circle Drive, Knoxville, TN, 38996, USA
| | - Uma Tumuluri
- Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, 37831, USA
| | - Zili Wu
- Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, 37831, USA.
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, 37831, USA.
- Department of Chemistry, University of Tennessee, 1420 Circle Drive, Knoxville, TN, 38996, USA.
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25
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Chen H, Xie Y, Sun X, Lv M, Wu F, Zhang L, Li L, Xu X. Efficient charge separation based on type-II g-C3N4/TiO2-B nanowire/tube heterostructure photocatalysts. Dalton Trans 2015; 44:13030-9. [PMID: 26102218 DOI: 10.1039/c5dt01757b] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Separation of photo-generated charges has played a crucial role in controlling the actual performance of a photocatalytic system. Here we have successfully fabricated g-C3N4/TiO2-B nanowire/tube heterostructures through facile urea degradation reactions. Owing to the effective separation of photo-generated charges associated with the type-II band alignment and intimate interfacial contacts between g-C3N4 and TiO2-B nanowires/tubes, such heterostructures demonstrate an improved photocatalytic activity over individual moieties. Synthetic conditions such as hydrothermal temperatures for the preparation of TiO2-B and the weight ratio of TiO2-B to urea were systematically investigated. A high crystallinity of TiO2-B as well as the proper growth of g-C3N4 on its surface are critical factors for a better performance. Our simple synthetic method and the prolonged lifetime of photo-generated charges signify the importance of type-II heterostructures in the photocatalytic applications.
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Affiliation(s)
- Hongmei Chen
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
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26
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Sun X, Xie Y, Wu F, Chen H, Lv M, Ni S, Liu G, Xu X. Photocatalytic Hydrogen Production over Chromium Doped Layered Perovskite Sr2TiO4. Inorg Chem 2015; 54:7445-53. [DOI: 10.1021/acs.inorgchem.5b01042] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoqin Sun
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Yinghao Xie
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Fangfang Wu
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Hongmei Chen
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Meilin Lv
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Shuang Ni
- Science and Technology
on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
| | - Gang Liu
- Shenyang National Laboratory for Materials
Science, Institute of Metal Research, Chinese Academy of Science, 72
Wenhua Road, Shenyang 110016, China
| | - Xiaoxiang Xu
- Shanghai Key Lab
of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, China
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27
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Lv M, Xie Y, Wang Y, Sun X, Wu F, Chen H, Wang S, Shen C, Chen Z, Ni S, Liu G, Xu X. Bismuth and chromium co-doped strontium titanates and their photocatalytic properties under visible light irradiation. Phys Chem Chem Phys 2015; 17:26320-9. [DOI: 10.1039/c5cp03889h] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bi/Cr were co-doped into SrTiO3viatwo synthetic routes. Unlike Cr, Bi does not significantly contribute to the electronic structure near Fermi level.
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28
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Zhu J, Li H, Zhong L, Xiao P, Xu X, Yang X, Zhao Z, Li J. Perovskite Oxides: Preparation, Characterizations, and Applications in Heterogeneous Catalysis. ACS Catal 2014. [DOI: 10.1021/cs500606g] [Citation(s) in RCA: 556] [Impact Index Per Article: 55.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Junjiang Zhu
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
| | - Hailong Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
| | - Linyun Zhong
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
| | - Ping Xiao
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
| | - Xuelian Xu
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
| | - Xiangguang Yang
- State
Key Laboratory of Rare Earth Resource Utilization, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin
Street, Changchun 130022, China
| | - Zhen Zhao
- State
Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, 18 Fuxue Road, Chang Ping, Beijing 102249, China
| | - Jinlin Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-central University for Nationalities, 182 minzudadao, Wuhan 430074, China
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