Promoting effect of hydrogen spillover on pyridine migration adsorbed on Lewis acid sites in USY zeolite
Catalysis Letters(1999)
摘要
The effect of hydrogen spillover over Pd/SiO 2 + 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/SiO 2 catalysts. This suggests that spilt-over hydrogen enhance the migration of pyridine adsorbed on Lewis acid sites.
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关键词
hydrogen spillover,zeolite,hybrid catalyst,Bronsted and Lewis acid sites,pyridine migration
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