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Several H‐zeolites (H‐Y, H‐ZSM‐5 and H‐MOR) were investigated for the catalytic combustion of chlorinated ethylenes, namely 1,1‐dichloroethylene and trichloroethylene. Conversion was inversely related to the chlorine content of the feed molecule. H‐ZSM‐5 zeolite was the most active catalyst in 1,1‐dichloroethylene combustion whereas H‐MOR was the most effective zeolite for trichloroethylene destruction. Temperature‐programmed desorption of ammonia and diffuse reflectance FT‐IR measurements of adsorbed pyridine revealed that strong Brønsted acidity plays an important role in controlling the activity of H‐zeolites. The main combustion products were CO, CO2, HCl, and Cl2. Additionally, small amounts of highly chlorinated by‐products were also detected, namely trichloroethylene and tetrachloroethylene. H‐zeolites showed a great selectivity to HCl formation.
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López‐Fonseca et al. (2002) studied this question.
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