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Abstract
We present an efficient strategy for synthesising the PdAu catalysts with a homogeneous PdAu alloy phase for environmentally important hydrodechlorination of tetrachloromethane in the gas phase. The synthesis of carbon-supported catalysts involved two major steps: (i) incorporation of palladium and gold nanoparticles into carbon support and (ii) activation of the catalysts. The critical part of this work was to find the optimal conditions for both steps. Thus, the incorporation of the nanoparticles was carried out in two ways, by impregnation and direct redox reaction method using acetone solutions of metal precursor salts. The activation was performed either by a conventional thermal reduction in hydrogen or flash irradiation in a microwave oven. The homogeneity and structure of the PdAu alloy were found to depend on the catalyst activation method critically. In all cases, we observed better homogeneity for catalysts that were subject to microwave irradiation. Moreover, the flash microwave irradiation of prepared catalysts provided catalysts of better stability and selectivity towards the desired products (hydrocarbons) in the hydrodechlorination of tetrachloromethane as compared to the catalyst obtained by conventional thermal activation in hydrogen.
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Tian S, Mao W, Sun P, Dang J, Zhou L, Lu J, Kemnitz E. Breakthrough synthesis of 2,3,3,3-tetrafluoropropene via hydrogen-assisted selective dehydrochlorination of 1,1,1,2-tetrafluoro-2-chloropropane over nickel phosphides. J Catal 2020. [DOI: 10.1016/j.jcat.2020.08.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Janmanchi K, Coppernoll A, Katsoulis D. Two-Step Process for the Synthesis of Dimethyldichlorosilane Using Copper Aluminate Catalysts. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b06700] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krishna Janmanchi
- Process Research & Development, Dow Silicones Corporation, Midland, Michigan 48686, United States
| | - Aaron Coppernoll
- Process Research & Development, Dow Silicones Corporation, Midland, Michigan 48686, United States
| | - Dimitris Katsoulis
- Process Research & Development, Dow Silicones Corporation, Midland, Michigan 48686, United States
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Bonarowska M, Matus K, Śrębowata A, Sá J. Application of silica-supported Ir and Ir-M (M = Pt, Pd, Au) catalysts for low-temperature hydrodechlorination of tetrachloromethane. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 644:287-297. [PMID: 29981976 DOI: 10.1016/j.scitotenv.2018.06.270] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 06/21/2018] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
Herein, it is presented a catalytic system for gas-phase hydrodechlorination of tetrachloromethane at low temperature and atmospheric pressure, using iridium supported on silica as parent catalyst. Iridium electronic configuration is suitable to catalyse the hydrodechlorination reactions, however, it has been rarely used in this reaction to date. The catalytic abilities were significantly improved when a second transition metal was added. Catalysts' stability and selectivity to the desired products (i.e. C1-C4 hydrocarbons) improved compared to conventional activation in hydrogen when catalysts were activated shortly with microwave irradiation. Microwave irradiation of catalysts favourably influences the homogeneity of the metallic active phase, both in terms of the size of metal crystals and the homogeneity of bimetallic systems. Addition of platinum to the 'parent' iridium catalyst improved its catalytic properties and decreased deactivation. Fresh and spent catalysts were comprehensively characterized using several techniques (BET, CO-chemisorption, XRD, XPS, electron microscopy and mass spectrometry) to determine structure-activity relationships and potential causes for catalyst deactivation. No significant changes in crystalline size or bimetallic phase composition were observed for spent catalysts (with the exception of Ir-Pd catalysts which underwent bulk carbide during the reaction).
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Affiliation(s)
- Magdalena Bonarowska
- Institute of Physical Chemistry Polish Academy of Sciences, Warsaw 01-224, Poland
| | - Krzysztof Matus
- Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice 44-100, Poland
| | - Anna Śrębowata
- Institute of Physical Chemistry Polish Academy of Sciences, Warsaw 01-224, Poland
| | - Jacinto Sá
- Institute of Physical Chemistry Polish Academy of Sciences, Warsaw 01-224, Poland; Department of Chemistry-Ångström, Uppsala University, Uppsala, 751 20, Sweden.
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Janiszewska E, Zieliński M, Kot M, Kowalewski E, Śrębowata A. Aqueous-Phase Hydrodechlorination of Trichloroethylene on Ir Catalysts Supported on SBA-3 Materials. ChemCatChem 2018. [DOI: 10.1002/cctc.201800873] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ewa Janiszewska
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89B Poznań 61-614 Poland
| | - Michał Zieliński
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89B Poznań 61-614 Poland
| | - Monika Kot
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89B Poznań 61-614 Poland
| | - Emil Kowalewski
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 Warszawa 01-224 Poland
| | - Anna Śrębowata
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 Warszawa 01-224 Poland
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Zhang W, Huang Y, Gong T, Feng H. Activated carbon supported palladium-iron oxide catalysts fabricated by atomic layer deposition for hydrodechlorination of 1,4-dichlorobenzene. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.01.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lazzarini A, Piovano A, Pellegrini R, Leofanti G, Agostini G, Rudić S, Chierotti MR, Gobetto R, Battiato A, Spoto G, Zecchina A, Lamberti C, Groppo E. A comprehensive approach to investigate the structural and surface properties of activated carbons and related Pd-based catalysts. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00159a] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Activated carbons and related Pd-based catalysts are investigated with a multi-techniques approach, which allows correlating structure and performance.
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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Ding K, Derk AR, Zhang A, Hu Z, Stoimenov P, Stucky GD, Metiu H, McFarland EW. Hydrodebromination and Oligomerization of Dibromomethane. ACS Catal 2012. [DOI: 10.1021/cs2006058] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Aihua Zhang
- Gas Reaction Technologies, Inc., 861 Ward Drive, Santa Barbara, California 93111, United States
| | | | - Peter Stoimenov
- Gas Reaction Technologies, Inc., 861 Ward Drive, Santa Barbara, California 93111, United States
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11
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Zheng X, Xiao Q, Zhang Y, Zhang X, Zhong Y, Zhu W. Deactivation of Pd/C catalysts in the hydrodechlorination of the chlorofluorocarbons CFC-115 and CFC-12. Catal Today 2011. [DOI: 10.1016/j.cattod.2011.02.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Meng BC, Sun ZY, Ma JP, Cao GP, Yuan WK. Selective Liquid-phase Hydrodechlorination of Chlorotrifluoroethylene over Palladium-Supported Catalysts: Activity and Deactivation. Catal Letters 2010. [DOI: 10.1007/s10562-010-0370-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Barbosa LAMM, Ribeiro FH, Somorjai GA. Theoretical Study of the Stability of Carbene Intermediates Formed During the Hydrodechlorination Reaction of the CF x Cl4−x Family on the Pd(110) Surface. Catal Letters 2009. [DOI: 10.1007/s10562-009-0154-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Pellegrini R, Leofanti G, Agostini G, Groppo E, Rivallan M, Lamberti C. Pd-supported catalysts: evolution of support porous texture along Pd deposition and alkali-metal doping. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:6476-6485. [PMID: 19348495 DOI: 10.1021/la900084p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Adsorption of N2 at 77 K and scanning electron microscopy have been used to measure the changes in the support morphology, at nano- and microscale level, along the processes involved in the preparation of a supported Pd catalyst: Pd deposition, doping, and thermal treatments. Among the investigated supports, viz., activated carbons, gamma-Al2O3, SiO2, and SiO2-Al2O3 (SA), the SA one was found particularly sensitive to these processes, as a result of its high plasticity and reactivity. Involved processes can be summarized as follows: (i) During the Pd deposition, the support itself is partially dissolved and removed as a result of both the basicity of the precipitating agent and the final washing. (ii) When the undoped sample is thermally treated up to 823 K, only modest phenomena are observed. (iii) Upon doping with potassium carbonate, the support dissolution continues, and the greater the carbonate concentration, the greater the dissolution extent. In this case the dissolved material is not removed, but reprecipitates (partially outside the pores), during the subsequent drying at 393 K. (iv) When doped samples are thermally treated, the reaction between carbonate and support causes the mobilization of the support itself, with sintering phenomena that can reach the total collapse of the porous structure. The starting temperature of the pore collapse decreases with increasing potassium carbonate concentration. The modification of the support influences, directly or indirectly, the surface properties and the availability of Pd particles that can be doped or even covered by materials from support and made more or less accessible or even inaccessible by pore narrowing, widening, or blocking.
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Affiliation(s)
- R Pellegrini
- Chimet S.p.A-Catalyst Division, Via di Pescaiola 74, I-52041 Viciomaggio, Arezzo, Italy.
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Legawiec-Jarzyna M, Juszczyk W, Bonarowska M, Kaszkur Z, Kępiński L, Kowalczyk Z, Karpiński Z. Hydrodechlorination of CCl4 on Pt–Au/Al2O3 Catalysts. Top Catal 2009. [DOI: 10.1007/s11244-009-9258-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Preface to the Special Issue in Honor of Jacob A. Moulijn. Ind Eng Chem Res 2007. [DOI: 10.1021/ie078001o] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Gentsler AG, Simagina VI, Netskina OV, Komova OV, Tsybulya SV, Abrosimov OG. Catalytic hydrodechlorination on palladium-containing catalysts. KINETICS AND CATALYSIS 2007. [DOI: 10.1134/s0023158407010090] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wiersma A, ten Cate A, van de Sandt EJAX, Makkee M. Development of a Kinetic Model for the Hydrogenolysis of CCl2F2 Over 1 wt % Pd/C. Ind Eng Chem Res 2007. [DOI: 10.1021/ie0611195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- André Wiersma
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, NL 2628 BL Delft, The Netherlands
| | - Andreas ten Cate
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, NL 2628 BL Delft, The Netherlands
| | - Emile J. A. X. van de Sandt
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, NL 2628 BL Delft, The Netherlands
| | - Michiel Makkee
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, NL 2628 BL Delft, The Netherlands
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de Pedro ZM, Gómez-Sainero LM, González-Serrano E, Rodríguez JJ. Gas-Phase Hydrodechlorination of Dichloromethane at Low Concentrations with Palladium/Carbon Catalysts. Ind Eng Chem Res 2006. [DOI: 10.1021/ie060621m] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zahara M. de Pedro
- Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Luisa M. Gómez-Sainero
- Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Eloisa González-Serrano
- Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Juan J. Rodríguez
- Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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A review of CFC and halon treatment technologies – The nature and role of catalysts. CATALYSIS SURVEYS FROM ASIA 2006. [DOI: 10.1007/s10563-006-9003-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Sriwatanapongse W, Reinhard M, Klug CA. Reductive hydrodechlorination of trichloroethylene by palladium-on-alumina catalyst: 13C solid-state NMR study of surface reaction precursors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:4158-64. [PMID: 16618159 DOI: 10.1021/la053087g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Adsorption of trichloroethylene (TCE) on alumina-supported palladium catalysts (Pd/Al2O3) was studied in the presence and absence of hydrogen using 13C-solid state NMR. Carbon-13 NMR spectra indicate that at low coverage strongly adsorbed species are formed while at high coverage additional physisorbed species are present. Carbon-13 spin-echo amplitude data measured as a function of pulse separation, tau, was used to determine the 13C-13C intramolecular dipolar coupling and the carbon-carbon bond length of adsorbed species. Results indicate that a substantial fraction of the chemisorbed carbon species had undergone carbon-carbon bond scission forming single-carbon fragments, suggesting that the activation energy for carbon-carbon bond scission is comparable to the heat of adsorption. For the remaining surface species, the double bond is elongated to 1.46 +/- 0.03 A and is suspected to be chemically bonded ethynyl. At room temperature, adding an excess of hydrogen to catalyst that is covered to saturation with TCE precursors produces only in a small amount of ethane, indicating the fraction of surface species that are hydrodehalogenation precursors is small.
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Affiliation(s)
- Watanee Sriwatanapongse
- Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, USA
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Yu H, Kennedy EM, Uddin MA, Sakata Y, Dlugogorski BZ. Gas-Phase and Pd-Catalyzed Hydrodehalogenation of CBrClF2, CCl2F2, CHClF2, and CH2F2. Ind Eng Chem Res 2005. [DOI: 10.1021/ie049228b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hai Yu
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia, and Department of Applied Chemistry, Okayama University, Tsushima Naka, Okayama 700-8530, Japan
| | - Eric M. Kennedy
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia, and Department of Applied Chemistry, Okayama University, Tsushima Naka, Okayama 700-8530, Japan
| | - Md. Azhar Uddin
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia, and Department of Applied Chemistry, Okayama University, Tsushima Naka, Okayama 700-8530, Japan
| | - Yusaku Sakata
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia, and Department of Applied Chemistry, Okayama University, Tsushima Naka, Okayama 700-8530, Japan
| | - Bogdan Z. Dlugogorski
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia, and Department of Applied Chemistry, Okayama University, Tsushima Naka, Okayama 700-8530, Japan
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Giannoccaro P, Gargano M, Fanizzi A, Ferragina C, Leoci A, Aresta M. Hydrodechlorination of polychlorobenzenes and polychlorinated aliphatic compounds under mild conditions by Pd and Rh ions or their complexes intercalated in γ-zirconium phosphate. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2004.10.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Role of hydrotalcite precursors as supports for Pd catalysts in hydrodechlorination of CCl2F2. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2003.09.048] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Hydrodechlorination of dichlorodifluoromethane, carbon tetrachloride and 1,2-dichloroethane over Pt/Al2O3 catalysts. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2004.07.033] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Krishna Murthy J, Chandra Shekar S, Padmasri A, Venugopal A, Siva Kumar V, Nagaraja B, Shashikala V, Raju B, Kanta Rao P, Rama Rao K. Promotional effect of magnesia addition to active carbon supported Pd catalyst on the characteristics and hydrodechlorination activity of CCl2F2. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2003.11.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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29
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Catalytic hydrodehalogenation of halon 1211 (CBrClF2) over γ-alumina-supported Ni, Pd and Pt catalysts. Catal Today 2004. [DOI: 10.1016/j.cattod.2003.11.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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Dehalogenative oligomerization of dichlorodifluoromethane catalyzed by activated carbon-supported Pt–Cu catalysts: effect of Cu to Pt atomic ratio. Catal Today 2004. [DOI: 10.1016/j.cattod.2003.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Hydrodechlorination of 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) over supported ruthenium and other noble metal catalysts. Catal Today 2004. [DOI: 10.1016/j.cattod.2003.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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32
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Uddin MA, Kennedy EM, Dlugogorski BZ. Gas-phase reaction of CCl2F2 (CFC-12) with methane. CHEMOSPHERE 2003; 53:1189-1191. [PMID: 14512123 DOI: 10.1016/s0045-6535(03)00658-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Gas-phase reaction of CFC-12 (CCl2F2) with methane was carried out in a plug flow reactor over the temperature range of 873-1123 K. The major organic halocarbons formed during the reaction were C2F4, C2H2F2, CHClF2, CH3Cl, C3H2F6 and CCl3F. The formation of all products except C2H2F2 decreased with temperature, while the selectivity to C2H2F2 (difluoroethylene) increased with temperature and reached approximately 80% at 1123 K. Under these reaction conditions, methane acts as hydrogen and carbon source, resulting in the formation of an unsaturated C2 hydrofluorocarbon from two C1 precursors.
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Affiliation(s)
- Md Azhar Uddin
- Process Safety and Environment Protection Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
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Kamiguchi S, Watanabe M, Kondo K, Kodomari M, Chihara T. Catalytic dehydrohalogenation of alkyl halides by Nb, Mo, Ta, and W halide clusters with an octahedral metal framework and by a Re chloride cluster with a triangular metal framework. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(03)00261-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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High-throughput experimentation in catalyst testing and in kinetic studies for heterogeneous catalysis. Catal Today 2003. [DOI: 10.1016/s0920-5861(03)00145-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Chandra Shekar S, Krishna Murthy J, Kanta Rao P, Rama Rao K. Pd supported on fluorinated carbon covered alumina (FCCA) a high performance catalyst in the hydrodechlorination of dichlorodifluoromethane. CATAL COMMUN 2003. [DOI: 10.1016/s1566-7367(02)00245-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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37
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Alonso F, Beletskaya IP, Yus M. Metal-mediated reductive hydrodehalogenation of organic halides. Chem Rev 2002; 102:4009-91. [PMID: 12428984 DOI: 10.1021/cr0102967] [Citation(s) in RCA: 607] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Francisco Alonso
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo 99, E-03080 Alicante, Spain
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Choi JY, Kim DS. Adsorption behavior of zinc and cadmium ion on granular activated carbon in singular and binary systems and the influence of nitrilotricetic acid as a complexing agent. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2002; 37:1701-1719. [PMID: 12403018 DOI: 10.1081/ese-120015431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Adsorption characteristics of zinc and cadmium ion on granular activated carbon have been studied in dynamic and equilibrium aspects and singular and binary adsorption behavior were compared. Based on the van't Hoff equation, reaction orders and rate constants were observed to increase as initial concentration of adsorbate was raised for both metal ions. Adsorption of Zn and Cd ion was found to increase with temperature, and this endothermic nature of adsorption reaction was further verified by thermodynamic calculation. Taking nitrilotriacetic acid (NTA) as a ligand, the influence of complexing agent was examined and the variation of adsorption percentage was found to closely relate with the change in ionic form of NTA depending upon pH conditions and amount of complexing agent used. Features of binary adsorption are discussed for several influential parameters and experimental observations for both ions were correlated with a predicted adsorption isotherm based on a Langmuir multi-component model.
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Affiliation(s)
- Jung-Yoon Choi
- Department of Environmental Science and Engineering, Ewha Womans University, Seodaemun-Gu, Seoul, Korea
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Pd–Au/Sibunit Carbon Catalysts: Characterization and Catalytic Activity in Hydrodechlorination of Dichlorodifluoromethane (CFC-12). J Catal 2002. [DOI: 10.1006/jcat.2002.3650] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cao YC, Jiang XZ. Supported palladium phthalocyanine catalysts in hydrodechlorination of CCl2F2. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(01)00516-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Highly selective zirconium oxychloride modified Pd/C catalyst in the hydrodechlorination of dichlorodifluoromethane to difluoromethane. CATAL COMMUN 2002. [DOI: 10.1016/s1566-7367(02)00075-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Catalytic hydrogenolysis of CFC-12 (CC12F2) over bimetallic palladium catalysts supported on activated carbon. KOREAN J CHEM ENG 2002. [DOI: 10.1007/bf02698409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Aytam HP, Akula V, Janmanchi K, Kamaraju SRR, Panja KR, Gurram K, Niemantsverdriet JW. Characterization and Reactivity of Pd/MgO and Pd/γ-Al2O3 Catalysts in the Selective Hydrogenolysis of CCl2F2†. J Phys Chem B 2002. [DOI: 10.1021/jp012357a] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Catalytic Hydrolysis of Dichlorodifluoromethane over Nanosized Titania-Supported Titanyl Sulfate. J Catal 2001. [DOI: 10.1006/jcat.2001.3392] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Centi G. Supported palladium catalysts in environmental catalytic technologies for gaseous emissions. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1381-1169(01)00155-8] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mori T, Kikuchi T, Kubo J, Morikawa Y. Hydrodechlorination of Trichloromethane to Higher Hydrocarbons over Pd/SiO2Catalyst. CHEM LETT 2001. [DOI: 10.1246/cl.2001.936] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Palladium–Silver Sol–Gel Catalysts for Selective Hydrodechlorination of 1,2-Dichloroethane into Ethylene. J Catal 2001. [DOI: 10.1006/jcat.2001.3188] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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