Abstract
Preparation method, characterization and molecular shape-selectivity of CVD (Chemical Vapor Deposition) zeolite is reviewed in detail. An ultra-thin layer of silica deposited to cover the external surface of zeolites is effective in controlling the pore-opening size without changing the internal structure. Because of its fine-controlled pore-opening size, extremely high shape-selectivity is observed on the CVD zeolites. Cracking of octane isomers on mordenites and methanol conversion on ZSM-5 were explained as examples of the improved shape-selectivity.
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