Deactivation behavior of Pd/C and Pt/C catalysts in the gas-phase hydrodechlorination of chloromethanes: Structure-reactivity relationship
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
Elsevier B.V.Date
2015-01-01Citation
10.1016/j.apcatb.2014.07.017
Applied Catalysis B: Environmental 162 (2015): 532-543
ISSN
0926-3373DOI
10.1016/j.apcatb.2014.07.017Funded by
The authors gratefully acknowledge financial support from the Spanish Ministerio de Economía y Competitividad (MINECO) through the project CTM2011-28352Project
Gobierno de España. CTM2011-28352Editor's Version
http://dx.doi.org/10.1016/j.apcatb.2014.07.017Subjects
Chloromethanes; Deactivation; Hydrodechlorination; Pd/C; Pt/C; QuímicaRights
© 2014 Elsevier B.V.Abstract
This study analyzes the influence of chemical and physical properties of Pd/C and Pt/C hydrodechlorination (HDC) catalysts in the different evolution of their activity during time on stream. Pt/C showed stable activity in the HDC of dichloromethane (DCM) and chloroform (TCM), while Pd/C was deactivated after 90h of operation, particularly during HDC of DCM. The deactivation of Pd/C catalyst can be attributed to the lower proportion of zero-valent species and larger metal particle size. This appears to hinder the H2 dissociation, enhance the irreversible chemisorption of reactants and reaction products, and favor coupling reactions (leading to the formation of carbonaceous deposits) and/or metal phase change reactions. The more extensive deactivation of Pd/C in the HDC of DCM is attributed to the stronger chemisorption of the reactant on the catalyst, which leads to the formation of a new PdCx phase by the incorporation of carbon atoms into the metal lattice
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Google Scholar:Martin-Martinez, M.
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Álvarez Montero, Ariadna
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Gómez Sainero, Luisa María
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Baker, R. T.
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Palomar Herrero, José Francisco
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Omar, Salama
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Eser, S.
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Rodríguez Jiménez, Juan José
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