Deactivation behavior of Pd/C and Pt/C catalysts in the gas-phase hydrodechlorination of chloromethanes : structure-reactivity relationship
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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 H 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 PdC phase by the incorporation of carbon atoms into the metal lattice.
Martin-Martinez , M , Álvarez-Montero , A , Gómez-Sainero , L M , Baker , R T , Palomar , J , Omar , S , Eser , S & Rodriguez , J J 2015 , ' Deactivation behavior of Pd/C and Pt/C catalysts in the gas-phase hydrodechlorination of chloromethanes : structure-reactivity relationship ' Applied Catalysis B: Environmental , vol 162 , pp. 532-543 . DOI: 10.1016/j.apcatb.2014.07.017
Applied Catalysis B: Environmental
Copyright © 2014 Elsevier B.V. NOTICE: this is the author’s version of a work that was accepted for publication in Applied Catalysis B: Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis B: Environmental, 162 (2015), DOI: 10.1016/j.apcatb.2014.07.017.
DescriptionThe authors acknowledge financial support from the Spanish Ministerio de Economía y Competitividad (MINECO) through the project CTM2011-28352. M. Martín Martínez acknowledges the Spanish Ministerio de Ciencia e Innovación (MICINN) and the European Social Fund (ESF) for her research grant.
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