TY - JOUR
T1 - Deactivation behavior of Pd/C and Pt/C catalysts in the gas-phase hydrodechlorination of chloromethanes
T2 - Structure-reactivity relationship
AU - Martin-Martinez, M.
AU - Álvarez-Montero, A.
AU - Gómez-Sainero, L. M.
AU - Baker, R. T.
AU - Palomar, J.
AU - Omar, S.
AU - Eser, S.
AU - Rodriguez, J. J.
N1 - Funding Information:
The authors gratefully 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. TEM and SEM were performed at the Electron Microscopy Facility at the University of St Andrews. We are grateful to JEOL UK Ltd for the provision of an additional high resolution image ( Fig. 13 (d)).
PY - 2015/1
Y1 - 2015/1
N2 - 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.
AB - 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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U2 - 10.1016/j.apcatb.2014.07.017
DO - 10.1016/j.apcatb.2014.07.017
M3 - Article
AN - SCOPUS:84905370198
SN - 0926-3373
VL - 162
SP - 532
EP - 543
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -