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Li H, Yatabe T, Takayama S, Yamaguchi K. Heterogeneously Catalyzed Selective Acceptorless Dehydrogenative Aromatization to Primary Anilines from Ammonia via Concerted Catalysis and Adsorption Control. JACS AU 2023; 3:1376-1384. [PMID: 37234130 PMCID: PMC10207093 DOI: 10.1021/jacsau.3c00049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 05/27/2023]
Abstract
Although catalytic dehydrogenative aromatization from cyclohexanones and NH3 is an attractive synthetic method for primary anilines, using a hydrogen acceptor was indispensable to achieve satisfactory levels of selectivity in liquid-phase organic synthetic systems without photoirradiation. In this study, we developed a highly selective synthesis of primary anilines from cyclohexanones and NH3 via efficient acceptorless dehydrogenative aromatization heterogeneously catalyzed by an Mg(OH)2-supported Pd nanoparticle catalyst in which Mg(OH)2 species are also deposited on the Pd surface. The basic sites of the Mg(OH)2 support effectively accelerate the acceptorless dehydrogenative aromatization via concerted catalysis, suppressing the formation of secondary amine byproducts. In addition, the deposition of Mg(OH)2 species inhibits the adsorption of cyclohexanones on the Pd nanoparticles to suppress phenol formation, achieving the desired primary anilines with high selectivity.
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Affiliation(s)
- Hui Li
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takafumi Yatabe
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Precursory
Research for Embryonic Science and Technology (PRESTO), Japan Science
and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Satoshi Takayama
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazuya Yamaguchi
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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2
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Influence of the metal − support and metal − metal interactions on Pd nucleation and NO adsorption in a Pd4/γ-Al2O3 (110D) model. J Mol Model 2022; 28:394. [DOI: 10.1007/s00894-022-05374-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 11/01/2022] [Indexed: 11/22/2022]
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3
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Ahn Y, Cho DW, Ahmad W, Jo J, Jurng J, Kurade MB, Jeon BH, Choi J. Efficient removal of formaldehyde using metal-biochar derived from acid mine drainage sludge and spent coffee waste. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 298:113468. [PMID: 34392094 DOI: 10.1016/j.jenvman.2021.113468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/26/2021] [Accepted: 07/31/2021] [Indexed: 06/13/2023]
Abstract
A novel metal-biochar (Biochar/AMDS) composite were fabricated by co-pyrolysis of spent coffee waste (SCW)/acid mine drainage sludge (AMDS), and their effective application in adsorptive removal of air pollutants such as formaldehyde in indoor environments was evaluated. The physicochemical characteristics of Biochar/AMDS were analyzed using SEM/EDS, XRF, XRD, BET, and FTIR. The characterization results illustrated that Biochar/AMDS had the highly porous structure, carbonaceous layers, and heterogeneous Fe phases (hematite, metallic Fe, and magnetite). The fixed-bed column test showed that the removal of formaldehyde by Biochar/AMDS was 18.4-fold higher than that by metal-free biochar (i.e., SCW-derived biochar). Changing the ratio of AMDS from 1:6 to 1:1 significantly increased the adsorption capacity for formaldehyde from 1008 to 1811 mg/g. In addition, thermal treatment of used adsorbent at 100 °C effectively restored the adsorptive function exhausted during the column test. These results provide new insights into the fabrication of practical, low-cost and ecofriendly sorbent for formaldehyde.
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Affiliation(s)
- Yongtae Ahn
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Dong-Wan Cho
- Geological Environment Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon, 34132, Republic of Korea
| | - Waleed Ahmad
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14, Seongbuk-gu, Seoul, 02792, Republic of Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Jungman Jo
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Jongsoo Jurng
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14, Seongbuk-gu, Seoul, 02792, Republic of Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea; Green School, Korea University, Seoul, Republic of Korea
| | - Mayur B Kurade
- Department of Earth Resources & Environmental Engineering, Hanyang University, 222-Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Byong-Hun Jeon
- Department of Earth Resources & Environmental Engineering, Hanyang University, 222-Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Jaeyoung Choi
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14, Seongbuk-gu, Seoul, 02792, Republic of Korea.
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4
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Keyvanfard M, Karimi-Maleh H, Karimi F, Opoku F, Kiarii EM, Govender PP, Taghavi M, Fu L, Aygun A, Sen F. Electro-catalytic amplified sensor for determination of N-acetylcysteine in the presence of theophylline confirmed by experimental coupled theoretical investigation. Sci Rep 2021; 11:1006. [PMID: 33441706 PMCID: PMC7806823 DOI: 10.1038/s41598-020-79872-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 11/26/2020] [Indexed: 01/08/2023] Open
Abstract
The 1,l/-bis(2-phenylethan-1-ol)ferrocene, 1-butyl-3-methylimidazolium hexafluoro phosphate (BMPF6) and NiO-SWCNTs were used to modify carbon paste electrode (BPOFc/BMPF6/NiO-SWCNTs/CPE), which could act as an electro-catalytic tool for the analysis of N-acetylcysteine in this work. The BPOFc/BMPF6/NiO-SWCNTs/CPE with high electrical conductivity showed two completely separate signals with oxidation potentials of 432 and 970 mV for the first time that is sufficient for the determination of N-acetylcysteine in the presence of theophylline. The BPOFc/BMPF6/NiO-SWCNTs/CPE showed linear dynamic ranges of 0.02–300.0 μM and 1.0–350.0 μM with the detection limit of ~ 8.0 nM and 0.6 μM for the measurement of N-acetylcysteine and theophylline, respectively. In the second part, understanding the nature of interaction, quantum conductance modulation, electronic properties, charge density, and adsorption behavior of N-acetylcysteine on NiO–SWCNTs surface from first-principle studies through the use of theoretical investigation is vital for designing high-performance sensor materials. The N-acetylcysteine molecule was chemisorbed on the NiO–SWCNTs surface by suitable adsorption energies (− 1.102 to − 5.042 eV) and reasonable charge transfer between N-acetylcysteine and NiO–SWCNTs.
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Affiliation(s)
- Mohsen Keyvanfard
- Department of Chemistry, Majlesi Branch, Islamic Azad University, Majlesi, Iran.
| | - Hassan Karimi-Maleh
- School of Resources and Environment, University of Electronic Science and Technology of China, Xiyuan Ave, Chengdu, 611731, People's Republic of China. .,Department of Chemical Engineering, Quchan University of Technology, Quchan, Iran. .,Department of Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg, 2028, South Africa.
| | - Fatemeh Karimi
- School of Resources and Environment, University of Electronic Science and Technology of China, Xiyuan Ave, Chengdu, 611731, People's Republic of China. .,Department of Chemical Engineering, Quchan University of Technology, Quchan, Iran.
| | - Francis Opoku
- Department of Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg, 2028, South Africa
| | - Ephraim Muriithi Kiarii
- Department of Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg, 2028, South Africa
| | - Poomani Penny Govender
- Department of Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg, 2028, South Africa
| | - Mehdi Taghavi
- Polymer Chemistry Research Laboratory, Faculty of Science, Shahid Chamran University, 61357-43337, Ahvaz, Iran
| | - Li Fu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Aysenur Aygun
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Çelebi Campus, 43100, Kütahya, Turkey
| | - Fatih Sen
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Çelebi Campus, 43100, Kütahya, Turkey
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Verma AM, Kishore N. First-principles study on the gas-phase decomposition of bio-oil oxygenated compounds over the palladium catalyst surface. Phys Chem Chem Phys 2019; 21:22320-22330. [PMID: 31576863 DOI: 10.1039/c9cp04858h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unprocessed bio-oils derived from the thermochemical conversion of lignocellulosic biomass suffer from low energy density primarily due to the presence of high amounts of oxygen functional groups. Therefore, the elimination of oxygen atoms over a suitable catalyst surface is viewed as one of the appropriate mechanisms for elevating the quality of bio-oils. Here, in this computational study, three oxygenated bio-oil model compounds, namely, 2-butenal, butan-2,3-diol, and butan-2,3-dione were considered as the representative compounds of the oxygenated catalogue of bio-oils. The decomposition mechanisms of these model compounds along with microkinetic modelling were studied over a palladium catalyst surface to produce low or no oxygen-containing products under the density functional theory (DFT) framework. Propene and methane were observed as the major products in the decomposition processes of 2-butenal and butan-2,3-dione, respectively. Butan-2,3-diol showed no major products due to high barriers. The increase in temperature was observed to be beneficial for improving the reaction rate constants; however, in many cases, the elevation of temperature shifted the equilibrium towards the reactants. CO acted as one of the major inhibitors due to the decarbonylation reaction of aldehydes.
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Affiliation(s)
- Anand Mohan Verma
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Assam, India781039.
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6
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Ma S, Fei S, Huang L, Forrey RC, Cheng H. Tuning the Catalytic Activity of Pd x Ni y ( x + y = 6) Bimetallic Clusters for Hydrogen Dissociative Chemisorption and Desorption. ACS OMEGA 2019; 4:12498-12504. [PMID: 31460369 PMCID: PMC6681985 DOI: 10.1021/acsomega.9b01360] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
Density functional theory was used to study dissociative chemisorption and desorption on Pd x Ni y (x + y = 6) bimetallic clusters. The H2 dissociative chemisorption energies and the H desorption energies at full H saturation were computed. It was found that bimetallic clusters tend to have higher chemisorption energy than pure clusters, and the capacity of Pd3Ni3 and Pd2Ni4 clusters to adsorb H atoms is substantially higher than that of other clusters. The H desorption energies of Pd3Ni3 and Pd2Ni4 are also lower than that of the Pd6 cluster and comparable to that of the Ni6 cluster, indicating that it is easier to pull the H atom out of these bimetallic catalysts. This suggests that the catalytic efficiency for specific Pd x Ni y bimetallic clusters may be superior to bare Ni or Pd clusters and that it may be possible to tune bimetallic nanoparticles to obtain better catalytic performance.
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Affiliation(s)
- Shuangxiu Ma
- Sustainable
Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), 388 Lumo Road, Wuhan 430074, PR China
| | - Shunxin Fei
- Sustainable
Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), 388 Lumo Road, Wuhan 430074, PR China
| | - Liang Huang
- The
State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, No. 947 Heping Road, Wuhan 430081, PR China
| | - Robert C. Forrey
- Department
of Physics, Penn State University, Berks Campus, Reading, Pennsylvania 19610-6009, United States
| | - Hansong Cheng
- Sustainable
Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), 388 Lumo Road, Wuhan 430074, PR China
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7
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Afzal MZ, Sun XF, Liu J, Song C, Wang SG, Javed A. Enhancement of ciprofloxacin sorption on chitosan/biochar hydrogel beads. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 639:560-569. [PMID: 29800849 DOI: 10.1016/j.scitotenv.2018.05.129] [Citation(s) in RCA: 131] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 04/17/2018] [Accepted: 05/10/2018] [Indexed: 05/27/2023]
Abstract
Biochar is effective in water treatment but it is hard to retrieve or separate biochar powder from aqueous solutions. In this study, the removal of ciprofloxacin from aqueous solutions was investigated using chitosan/biochar hydrogel beads (CBHB). The results showed that the adsorption rate was almost independent of the temperature and occurred at the homogeneous sites of adsorbent thus obeying the Langmuir model. The equilibrium time was varying for different initial concentrations and found to be 48 h for maximum one. The maximum sorption was found to be >76 mg/g of adsorbent out of 160 mg/L as initial concentration. Adsorption obeyed the second-order mechanism with leading role of intra-particle diffusion and outer diffusion. Adsorption capacity decreased from 34.90 mg/g to 15.77 mg/g in the presence of 0.01 N Na3PO4 whereas other electrolytes such as NaCl, Na2SO4, NaNO3 with same concentration did not affect the sorption capacity. However, increased concentration of NaCl reduced the sorption capacity to some extent. CBHB showed a mixed mechanism by removing CIP through π-π electron donor-acceptor (EDA) interaction, hydrogen bonding and hydrophobic interaction. The reformation of CBHB with methanol and ethanol instead of water decreased its sorption capacity to 32.69 mg/g and 29.29 mg/g. Adsorption decreased by little after every regeneration of CBHB and was still >64 ± 0.68% (25.73 mg/g) after 6th regeneration. The efficacy of CBHB for CIP removal proved that CBHB is an economical and sustainable adsorbent.
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Affiliation(s)
- Muhammad Zaheer Afzal
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China; Department of Earth and Environmental Sciences, Bahria University, Islamabad 44000, Pakistan
| | - Xue-Fei Sun
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
| | - Jun Liu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Chao Song
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Shu-Guang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
| | - Asif Javed
- Department of Earth and Environmental Sciences, Bahria University, Islamabad 44000, Pakistan
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8
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Verma AM, Kishore N. Molecular modeling approach to elucidate gas phase hydrodeoxygenation of guaiacol over a Pd(111) catalyst within DFT framework. J Mol Model 2018; 24:254. [PMID: 30151645 DOI: 10.1007/s00894-018-3803-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 08/16/2018] [Indexed: 11/26/2022]
Abstract
Excessive amounts of oxy-functional groups in unprocessed bio-oil vitiate its quality as fuel; therefore, it has to be channelized to upgrading processes, and catalytic hydrodeoxygenation is one of the most suitable routes for the upgrading of crude bio-oil. In this computational work, catalytic hydrodeoxygenation (HDO) of guaiacol, which is an important phenolic compound of crude bio-oil, has been carried out using density functional theory (DFT) over a Pd(111) catalyst. The Pd(111) catalyst surface does not endorse direct eliminations of functional groups of guaiacol; however, it is found to perform excellently in stepwise dehydrogenation reactions of oxy-functionals of guaiacol according to present DFT results. The catechol product, formed through dehydrogenation of the methoxy group, followed by elimination of CH2 and association of the hydrogen atom, has been identified as one of the major products. The overall reaction rate is controlled by scission of CH2 from 2-methylene-oxy-phenol with an activation energy demand of 23.06 kcal mol-1. Further, the kinetic analysis of each reaction step involved in HDO of guaiacol over the Pd(111) catalyst surface has also been carried out at atmospheric pressure and at a wide range of temperatures from 473 to 673 K, with temperature intervals of 50 K. In the kinetic analysis part, various kinetic parameters, such as forward and reverse reaction rate constants, Arrhenius constants, and equilibrium rate constants, are reported. The kinetic modeling of the dominating reaction steps has revealed that even a lower temperature of 473 K provides a favorable reaction environment; and the temperature increment further improves the reaction favorability.
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Affiliation(s)
- Anand Mohan Verma
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Nanda Kishore
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
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9
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Metal Clusters Dispersed on Oxide Supports: Preparation Methods and Metal-Support Interactions. Top Catal 2018. [DOI: 10.1007/s11244-018-0957-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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10
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Verma AM, Kishore N. Molecular simulations of palladium catalysed hydrodeoxygenation of 2-hydroxybenzaldehyde using density functional theory. Phys Chem Chem Phys 2018; 19:25582-25597. [PMID: 28902200 DOI: 10.1039/c7cp05113a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic conversion of 2-hydroxybenzaldehyde (2-HB) is carried out numerically over a Pd(111) surface using density functional theory. The palladium catalyst surface is designed using a 12 atom monolayer and verified with the adsorption of phenol, benzene, anisole, guaiacol, and vanillin; it is found that the adsorption energies along with the adsorption configurations of phenol and benzene are in excellent agreement with the literature. The conversion of 2-HB over the Pd(111) catalyst surface is performed using four reaction schemes: (i) dehydrogenation of the formyl group followed by elimination of CO and association of hydrogen with 2-hydroxyphenyl to produce phenol, (ii) direct elimination of CHO from 2-HB followed by elimination of hydrogen from adsorbed CHO and association of hydrogen with 2-hydroxyphenyl to produce phenol, (iii) direct dehydroxylation of 2-HB followed by association of a hydrogen atom with 2-formylphenyl to produce benzaldehyde, and (iv) dehydrogenation of the hydroxyl group of 2-HB followed by elimination of an oxygen atom and association of a hydrogen atom with 2-formylphenyl to produce benzaldehyde. Along with the reaction mechanisms and their barrier heights, all reaction steps are considered for kinetic modelling in the temperature range 498-698 K with 50 K intervals. The rate constants, pre-exponential factors, and equilibrium constants of all elementary reaction steps are evaluated for each temperature. Kinetic analyses of the catalytic conversion of 2-HB over the Pd(111) surface suggests the production of phenol as an intermediate, instead of benzaldehyde, via dehydrogenation of the formyl group of 2-HB as a first elementary reaction step because of its low activation barrier and the high rate constant of the rate controlling step. Furthermore, the equilibrium constants of the rate controlling step in the production of phenol from 2-HB over the Pd(111) surface report a major fraction of the product in the product mixture even at a low temperature of 498 K.
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Affiliation(s)
- Anand Mohan Verma
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, 781039, India.
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11
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Verma AM, Kishore N. Platinum catalyzed hydrodeoxygenation of guaiacol in illumination of cresol production: a density functional theory study. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170650. [PMID: 29291058 PMCID: PMC5717632 DOI: 10.1098/rsos.170650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 10/10/2017] [Indexed: 06/07/2023]
Abstract
The unprocessed bio-oil obtained by the pyrolysis of lignocellulosic biomass comprises hundreds of oxy-components which vitiate its quality in terms of low heating value, low stability, low pH, etc. Therefore, it has to be upgraded prior to its use as transportation fuel. In this work, guaiacol, a promising compound of the phenolic fraction of unprocessed bio-oil, is considered as a model component for studying its hydrodeoxygenation over a Pt3 catalyst cluster. The production of catechol, 3-methylcatechol, m-cresol and o-cresol from guaiacol over a Pt3 cluster is numerically investigated using density functional theory. Further, the kinetic parameters are obtained over a wide range of temperature, i.e. 473-673 K at an interval of 50 K. Briefly, results indicate that O─H and C─H bond scissions determine the reaction rates of 'guaiacol to catechol' and 'catechol to 3-methylcatechol' reactions with activation energies of 30.32 and 41.3 kcal mol-1, respectively. On the other hand, C─O bond scissions determine the rates of 3-methylcatechol to m- and o-cresol production reactions, respectively. The kinetics of all reactions indicate that ln k versus 1/T plots are linear over the entire range of temperature considered herein.
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12
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Asatryan R, Ruckenstein E. Effect of “Reducible” Titania Promotion on the Mechanism of H-Migration in Pd/SiO2 Clusters. Catal Letters 2015. [DOI: 10.1007/s10562-015-1642-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Zhuang Y, Yu F, Ma J, Chen J. Adsorption of ciprofloxacin onto graphene–soy protein biocomposites. NEW J CHEM 2015. [DOI: 10.1039/c5nj00019j] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
New biocomposite, porous graphene–soy protein (GS) aerogels were prepared by a simple hydrothermal method and the mechanism of ciprofloxacin adsorption onto them was investigated.
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Affiliation(s)
- Yuan Zhuang
- State Key Laboratory of Pollution Control and Resource Reuse
- School of Environmental Science and Engineering
- Tongji University
- Shanghai 200092
- P. R. China
| | - Fei Yu
- College of Chemistry and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 2001418
- China
| | - Jie Ma
- State Key Laboratory of Pollution Control and Resource Reuse
- School of Environmental Science and Engineering
- Tongji University
- Shanghai 200092
- P. R. China
| | - Junhong Chen
- State Key Laboratory of Pollution Control and Resource Reuse
- School of Environmental Science and Engineering
- Tongji University
- Shanghai 200092
- P. R. China
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14
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Xia X, Zeng J, Zhang Q, Moran CH, Xia Y. Recent Developments in Shape-Controlled Synthesis of Silver Nanocrystals. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2012; 116:21647-21656. [PMID: 23105955 PMCID: PMC3480233 DOI: 10.1021/jp306063p] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
This feature article introduces our recent work on understanding the roles played by citrate and poly(vinyl pyrrolidone) (PVP) as capping agents in seed-mediated syntheses of Ag nanocrystals with controlled shapes. We have demonstrated that citrate and PVP selectively bind to Ag(111) and Ag(100) surfaces, respectively, and thus favor the formation of Ag nanocrystals enclosed preferentially by {111} or {100} facets. In addition, we have quantified the coverage density of PVP adsorbed on the surface of Ag nanocubes. Based on the mechanistic understanding, a series of Ag nanocrystals with controlled shapes and sizes have been successfully synthesized by using different combinations of seeds and capping agents: single-crystal spherical/cubic seeds with citrate for cuboctahedrons and octahedrons or with PVP for cubes and bars; and plate-like seeds with citrate for enlarged thin plates or with PVP for thickened plates.
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Affiliation(s)
- Xiaohu Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, and School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Jie Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Qiang Zhang
- School of Life Science, East China Normal University, Shanghai 200241, P. R. China
| | - Christine H. Moran
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, and School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Younan Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, and School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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15
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Yang J, Lv CQ, Guo Y, Wang GC. A DFT+U study of acetylene selective hydrogenation on oxygen defective anatase (101) and rutile (110) TiO2 supported Pd4 cluster. J Chem Phys 2012; 136:104107. [DOI: 10.1063/1.3692292] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Kacprzak KA, Czekaj I, Mantzaras J. DFT studies of oxidation routes for Pd9 clusters supported on γ-alumina. Phys Chem Chem Phys 2012; 14:10243-7. [DOI: 10.1039/c2cp40715a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yuan X, Liu L, Wang X, Yang M, Jackson KA, Jellinek J. Theoretical Investigation of Adsorption of Molecular Oxygen on Small Copper Clusters. J Phys Chem A 2011; 115:8705-12. [DOI: 10.1021/jp200125t] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiuxiang Yuan
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Liuxia Liu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Xin Wang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Mingli Yang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Koblar Alan Jackson
- Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, United States
| | - Julius Jellinek
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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Kang GJ, Chen ZX, Li Z. Acrolein Adsorption on Gold Clusters, A Theoretical Study of Conjugation Effect on C=C and C=O Interaction with Au Clusters. Catal Letters 2011. [DOI: 10.1007/s10562-011-0569-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kang GJ, Chen ZX, Li Z. Theoretical studies of the interactions of ethylene and formaldehyde with gold clusters. J Chem Phys 2009; 131:034710. [DOI: 10.1063/1.3167408] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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