Hydrodechlorination of carbon tetrachloride over PtNaX zeolite: Deactivation studies

Hydrodechlorination of carbon tetrachloride over PtNaX zeolite: Deactivation studies

Platinum-containing NaX zeolite showed high activity and high methane selectivity in the hydrodechlorination of carbon tetrachloride. The catalyst showed fast deactivation. To identify the possible causes of deactivation, the fresh and used catalysts were studied by thermogravimetric analysis, X-ray...

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Bibliographic Details
Published in:Catalysis today Vol. 107; pp. 493 - 499
Main Authors: de Souza, Adriana Galdino Figueira, Bentes, Ayr Manoel Portilho, Rodrigues, Alexandre Carlos Camacho, Borges, Luiz Eduardo Pizarro, Monteiro, José Luiz Fontes
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 30-10-2005
Elsevier Science
Subjects:
Carbon tetrachloride
Catalysis
Chemistry
Deactivation
Exact sciences and technology
General and physical chemistry
Hydrodechlorination
Ion-exchange
Platinum
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Zeolite X
Zeolites: preparations and properties
Zeolite X
Deactivation
Platinum
Carbon tetrachloride
Hydrodechlorination
Chlorine compounds
Heterogeneous catalysis
Transition metal
Zeolite
Molecular sieve
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Summary:Platinum-containing NaX zeolite showed high activity and high methane selectivity in the hydrodechlorination of carbon tetrachloride. The catalyst showed fast deactivation. To identify the possible causes of deactivation, the fresh and used catalysts were studied by thermogravimetric analysis, X-ray diffraction, thermoprogrammed oxidation, infrared spectroscopy and diffuse reflectance spectroscopy. The results indicate that the deactivation is probably caused by the attack of the HCl produced during the reaction to the zeolite structure forming an amorphous aluminosilicate. The HCl adsorption can also be pointed as a cause for deactivation. It is worthy to mention that no coke formation (oligomers) was observed, which is not consistent to some other observations made for other platinum-containing catalysts.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2005.07.062