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Kong X, Xiao J, Chen A, Chen L, Li C, Feng L, Ren X, Fan X, Sun W, Sun Z. Enhanced Catalytic Denitrification Performance of Ruthenium-based Catalysts by Hydrogen Spillover from a Palladium Promoter. J Colloid Interface Sci 2022; 608:2973-2984. [PMID: 34838314 DOI: 10.1016/j.jcis.2021.11.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/29/2021] [Accepted: 11/05/2021] [Indexed: 11/27/2022]
Abstract
Catalytic denitrification, a promising technology for nitrate removal, is increasingly limited by the rising price of Pd. Replacing Pd with less-expensive Ru would significantly reduce the cost; however, Ru-based catalysts have been reported to perform inconsistently in denitrification applications, making their replacement prospects unclear. Herein, the surface oxidation of Ru catalysts was confirmed to be a key factor that inhibits activity. A series of Ru-Pd catalysts containing small amounts of Pd (0.5 wt%) was developed to eliminate the Ru surface-oxide layer through the spillover of hydrogen atoms activated on the Pd promoter. Ru-Pd/Fe3O4 exhibited superior catalytic activity to Ru-Pd/C and Ru-Pd/Al2O3 because the reducible carrier (Fe3O4) has a lower resistance to hydrogen spillover and diffusion, as determined experimentally and supported by density functional theory calculations. This study developed a method that eliminates ruthenium surface oxides in situ and restores its denitrification activity, further reducing the barrier to Ru replacing Pd in catalytic aqueous denitrification.
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Affiliation(s)
- Xiao Kong
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Jun Xiao
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China
| | - Aitao Chen
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Long Chen
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Chao Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Liu Feng
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Xiaoli Ren
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China
| | - Xinzhuang Fan
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China
| | - Wuzhu Sun
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandon Province 255000, China.
| | - Zhongti Sun
- School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, China.
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2
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Deng J, Xue T, Wu HH, Wu P. Preparation of cost-effective Ni-Ag bimetallic catalyst for hydrodehalogenation of aryl halides under mild conditions. NEW J CHEM 2022. [DOI: 10.1039/d2nj01532c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cost-effective Ni-Ag bimetallic nanoparticles were prepared using an aqueous-phase surfactant-aided co-reduction process and used as catalyst for the hydrodehalogenation of aryl halides CAr-X (X=F, Cl, Br). The CAr-X could be...
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Sanni SE, Philemon O, Okoro EE, Oni BA, Idowu TA, Adegbite O. Heterogeneous catalytic conversion of 4-chlorophenol via atomic hydrogen substitution induced by size-controlled polydisperse nanocobalt. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Sun K, Yang G, Han J, Chai Y, Li Y, Wang C, Mintova S, Liu C, Guo H. Efficient hydrodesulfurization of dibenzothiophene over core–shell Ni/Al 2O 3@SOD and Mo/Al 2O 3 composite catalysts. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00667g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A DBT HDS reaction scheme based on different composite catalysts (Ni/Al2O3@SOD–Mo/Al2O3 and Ni/Al2O3–Mo/Al2O3) is proposed.
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Affiliation(s)
- Kun Sun
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Ge Yang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
- College of Science, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Jiaxin Han
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yongming Chai
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yanpeng Li
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Chunzheng Wang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Svetlana Mintova
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
- Laboratoire Catalyse et Spectrochimie, Normandie University, ENSICAEN, UNICAEN, 6 boulevard du Marechal Juin, 14050 Caen, France
| | - Chenguang Liu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Hailing Guo
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
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5
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Applicability of Nickel-Based Catalytic Systems for Hydrodehalogenation of Recalcitrant Halogenated Aromatic Compounds. Catalysts 2021. [DOI: 10.3390/catal11121465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
This review summarizes recent applications of nickel as a nonprecious metal catalyst in hydrodehalogenation (HDH) reactions of halogenated aromatic compounds (Ar–Xs). Nickel-based HDH catalysts were developed for reductive treatment of both waste containing concentrated Ar–Xs (mainly polychlorinated benzenes) and for wastewater contaminated with Ar–Xs. Ni-catalyzed HDH enables the production of corresponding nonhalogenated aromatic products (Ar–Hs), which are principally further applicable/recyclable and/or Ar–Hs, which are much more biodegradable and can be mineralized during aerobic wastewater treatment. Developed HDH methods enable the utilization of both gaseous hydrogen via the direct HDH process or other chemical reductants as a source of hydrogen utilized in the transfer of the hydrodehalogenation process. This review highlights recent and major developments in Ni-catalyzed hydrodehalogenation topic since 1990.
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6
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Ryaboshapka DA, Lokteva ES, Golubina EV, Kharlanov AN, Maslakov KI, Kamaev AO, Shumyantsev AV, Lipatova IA, Shkol’nikov EI. Gas-Phase Hydrodechlorination of Chlorobenzene over Alumina-Supported Nickel Catalysts: Effect of Support Structure and Modification with Heteropoly Acid HSiW. KINETICS AND CATALYSIS 2021. [DOI: 10.1134/s0023158420060130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Meng X, Yan R, Zuo S, Zhang Y, Li Z, Wang H. Synthesis of Bimetallic Au-Ag/CMK-3 Catalysts and Their Catalytic Activity for the Oxidation of Amino Alcohol. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiangzhan Meng
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P.R. China
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P.R. China
| | - Ruiyi Yan
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P.R. China
| | - Shouwei Zuo
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yongqiang Zhang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P.R. China
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P.R. China
| | - Zengxi Li
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Hui Wang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P.R. China
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, P.R. China
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8
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Golubina EV, Lokteva ES, Kavalerskaya NE, Maslakov KI. Effect of Calcination Temperature on the Efficiency of Ni/Al2O3 in the Hydrodechlorination Reaction. KINETICS AND CATALYSIS 2020. [DOI: 10.1134/s002315842003012x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Biswas K, Chattopadhyay S, Jing Y, Che R, De G, Basu B, Zhao D. Polyionic Resin Supported Pd/Fe2O3Nanohybrids for Catalytic Hydrodehalogenation: Improved and Versatile Remediation for Toxic Pollutants. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b04464] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Kinkar Biswas
- Department of Chemistry, North Bengal University, Darjeeling 734013, India
| | - Shreyasi Chattopadhyay
- CSIR−Central Glass & Ceramics Research Institute, 196 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Yunke Jing
- Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers and Advanced Materials Laboratory, Fudan University, Shanghai 200433, P. R. China
| | - Renchao Che
- Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers and Advanced Materials Laboratory, Fudan University, Shanghai 200433, P. R. China
| | - Goutam De
- CSIR−Central Glass & Ceramics Research Institute, 196 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
- Institute of Nano Science and Technology, Mohali 166062, Punjab, India
| | - Basudeb Basu
- Department of Chemistry, North Bengal University, Darjeeling 734013, India
- Raiganj University, Raiganj 733134, India
| | - Dongyuan Zhao
- Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers and Advanced Materials Laboratory, Fudan University, Shanghai 200433, P. R. China
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10
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Overcoming the limitations of gold catalysts in hydrogenation: enhanced activity with full hydrogen utilization. REACTION KINETICS MECHANISMS AND CATALYSIS 2018. [DOI: 10.1007/s11144-018-1417-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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11
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Payal DD, Vaidya PD. Aqueous-phase hydrodechlorination of model chlorinated organic compounds over Ru/C catalyst. CHEM ENG COMMUN 2018. [DOI: 10.1080/00986445.2017.1412309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Dipak D. Payal
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, India
| | - Prakash D. Vaidya
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, India
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12
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Li M, Wang X, Cárdenas-Lizana F, Keane MA. Effect of support redox character on catalytic performance in the gas phase hydrogenation of benzaldehyde and nitrobenzene over supported gold. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.06.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Ma X, Liu S, Liu Y, Gu G, Xia C. Comparative study on catalytic hydrodehalogenation of halogenated aromatic compounds over Pd/C and Raney Ni catalysts. Sci Rep 2016; 6:25068. [PMID: 27113406 PMCID: PMC4844995 DOI: 10.1038/srep25068] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 04/11/2016] [Indexed: 11/23/2022] Open
Abstract
Catalytic hydrodehalogenation (HDH) has proved to be an efficient approach to dispose halogenated aromatic compounds (HACs). Liquid-phase HDH of single and mixed halobenzenes/4-halophenols with H2 over 5% Pd/C and Raney Ni catalyst are investigated and compared. For liquid-phase HDH of single HACs, hydrogenolytic scission reactivity of C-X bonds decreases in order of C-Br > C-Cl > C-I > C-F over Pd/C catalyst, and in order of C-I > C-Br > C-Cl > C-F over Raney Ni catalyst. To clarify the reason why hydrogenolytic scission reactivity of C-X bonds over Pd/C and Raney Ni catalysts exhibits different trends, liquid-phase HDH of mixed HACs over Pd/C and Raney Ni catalysts were studied, and catalysts are characterized by SEM, EDX, and XRD techniques. It was found that the high adsorption of iodoarenes on Pd/C catalyst caused the HDH reactivity of iodoarenes to be lower than that of chloroarenes and bromoarenes in the HDH of single HACs. Moreover, the adsorption of in situ produced iodine ion (I−) to catalyst surface would result in the decline of catalytic activity, which might be the main reason why the HDH reactivity of HACs in the presence of NaI is rather low.
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Affiliation(s)
- Xuanxuan Ma
- School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China
| | - Sujing Liu
- Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Ying Liu
- School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China
| | - Guodong Gu
- Alliance Pharma, Inc. 17 Lee Boulevard Malvern, PA 19355, USA
| | - Chuanhai Xia
- School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China
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14
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Cárdenas-Lizana F, Pedro ZMD, Gómez-Quero S, Kiwi-Minsker L, Keane MA. Carbon supported gold and silver: Application in the gas phase hydrogenation of m -dinitrobenzene. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.07.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Cecilia JA, Infantes-Molina A, Rodríguez-Castellón E. Hydrodechlorination of polychlorinated molecules using transition metal phosphide catalysts. JOURNAL OF HAZARDOUS MATERIALS 2015; 296:112-119. [PMID: 25913677 DOI: 10.1016/j.jhazmat.2015.04.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 03/08/2015] [Accepted: 04/08/2015] [Indexed: 06/04/2023]
Abstract
Ni2P and CoP catalysts (5 wt.% of metal) supported on a commercial SiO2 were tested in the gas phase catalytic hydrodechlorination (HDCl) of mono (chlorobenzene-ClB) and polychlorobenzenes (PCBs) (1,2- dichlorobenzene (1,2-DClB), 1,3-dichlorobenzene (1,3-DClB), 1,4-dichlorobenzene (1,4-DClB), and 1,2,4-trichlorobenzene (1,2,4-TClB)) at atmospheric pressure. It was investigated how the number and position of chlorine atoms in the molecule influence the HDCl activity. The prepared catalysts were characterized by X-ray diffraction (XRD), CO chemisorption, N2 adsorption-desorption at -196°C, and X-ray photoelectron spectroscopy (XPS). Characterization results indicated better active phase dispersion and greater amount of P on the Ni2P catalyst surface. Catalytic results showed that the Ni2P was more active and stable in this type of reactions. The hydrodechlorination activity decreased by increasing the number of chlorine atoms in the molecule and chlorine substituents in close proximity. The observed trend in the HDCl activity was: ClB>1,4-DClB>1,3-DClB>1,2-DClB>1,2,4-TClB. The exception was the catalytic response after 24h on stream observed for the Ni2P in the HDCl reaction of 1,2,4-TClB, which was equal to that observed for the 1,4-DClB molecule, and also yielding benzene as the main reaction product.
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Affiliation(s)
- J A Cecilia
- Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain
| | - A Infantes-Molina
- Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
| | - E Rodríguez-Castellón
- Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain
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Otroshchenko TP, Turakulova AO, Lokteva ES, Golubina EV, Lunin VV. Catalysts based on PdO_ZrO2 in the hydrodechlorination reaction of chlorobenzene. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2015. [DOI: 10.1134/s0036024415070262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Chen J, Guo T, Li K, Sun L. A facile approach to enhancing activity of Ni2P/SiO2 catalyst for hydrodechlorination of chlorobenzene: promoting effect of water and oxygen. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00044k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Ni2P/SiO2 activity for the hydrodechlorination of chlorobenzene was remarkably enhanced by the treatment with H2O or O2.
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Affiliation(s)
- Jixiang Chen
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Department of Catalysis Science and Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
| | - Ti Guo
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Department of Catalysis Science and Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
| | - Kelun Li
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Department of Catalysis Science and Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
| | - Lingmin Sun
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Department of Catalysis Science and Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
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18
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Hao Y, Wang X, Perret N, Cárdenas-Lizana F, Keane MA. Support effects in the gas phase hydrogenation of butyronitrile over palladium. ACTA ACUST UNITED AC 2014. [DOI: 10.1179/2055075814y.0000000002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- Yufen Hao
- Chemical Engineering School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK
| | - Xiaodong Wang
- Chemical Engineering School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK
| | - Noémie Perret
- Chemical Engineering School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK
| | - Fernando Cárdenas-Lizana
- Chemical Engineering School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK
| | - Mark A. Keane
- Chemical Engineering School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK
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Cecilia JA, Infantes-Molina A, Rodríguez-Castellón E, Jiménez-López A. Gas phase catalytic hydrodechlorination of chlorobenzene over cobalt phosphide catalysts with different P contents. JOURNAL OF HAZARDOUS MATERIALS 2013; 260:167-175. [PMID: 23747475 DOI: 10.1016/j.jhazmat.2013.05.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/06/2013] [Accepted: 05/08/2013] [Indexed: 06/02/2023]
Abstract
The gas phase catalytic hydrodechlorination (HDC) of chlorobenzene (CB) at atmospheric pressure was investigated over silica-supported cobalt and cobalt phosphide catalysts containing different P loading and a fixed amount of cobalt (5 wt.%). The effect of the initial P/Co molar ratio on the stoichiometry of the cobalt phosphide phase, the acidity and the hydrogen activation capability were discussed and these properties correlated with the catalytic activity. Catalytic results indicated that the cobalt phosphide phase is much more active than the monometallic cobalt one. The activity raised with the P content present in the sample due to the formation of the CoP phase instead of the Co₂P one, which favored the formation of hydrogen spillover species, increased the amount of weak acid sites and the number of exposed superficial cobalt atoms probably related to a better dispersion of the active phase. All the catalysts gave rise benzene as the main reaction product.
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Affiliation(s)
- J A Cecilia
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain
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