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The effect of spilt-over hydrogen on catalysts which were prepared by physically mixing zeolites or alumina with SiO 2 -supported noble metals on chemisorbed pyridine was investigated by means of FTIR and TPD. It has been found that pyridine adsorbed on a Lewis acid site migrated to a Brønsted acid site under a hydrogen atmosphere. This suggests that spilt-over hydrogen should enhance the...
The effect of hydrogen spillover over Pd/SiO2 + USY on pyridine chemisorbed on acid sites of USY zeolite was investigated. According to FTIR measurement, pyridine adsorbed on Lewis acid sites migrated to Brønsted acid sites under hydrogen-flowing atmosphere. The rate of migration was drastically promoted by physically mixed Pd/SiO2 catalysts. This suggests that spilt-over hydrogen enhance the migration...
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