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Oxidative destruction of dichloromethane over protonic zeolites
Author(s) -
LópezFonseca R.,
Cibrián S.,
GutiérrezOrtiz J. I.,
GutiérrezOrtiz M. A.,
GonzálezVelasco J. R.
Publication year - 2003
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690490219
Subject(s) - dichloromethane , chemistry , catalysis , pyridine , zeolite , inorganic chemistry , chloride , hydrogen chloride , decomposition , selectivity , adsorption , ammonia , medicinal chemistry , nuclear chemistry , organic chemistry , solvent
Various protonic zeolites (H‐Y, H‐ZSM‐5, and H‐MOR) were tested for the total combustion of dichloromethane (DCM) as a model reaction for the catalytic destruction of chlorinated organic pollutants. The order of catalytic activity decreased in the following order: H‐MOR > H‐ZSM‐5 > H‐Y. Strong Brønsted acidity played a determining role in controlling the active catalytic behavior as revealed by TPD of ammonia and IR measurements of adsorbed pyridine. DCM oxidative decomposition gave rise to CO and HCl as main products along with small amounts of CO 2 and Cl 2 . In addition, methyl chloride was detected as a reaction intermediate between 250 and 500°C. The presence of water in the feed stream led to an inhibition of the zeolite activity and resulted in a noticeable change in the reaction product distribution. Water effectively promoted the selectivity toward environmentally desirable reaction products, that is, HCl and CO 2 , and completely suppressed the formation of methyl chloride.