Hierarchical SAPO-34 catalysts with different morphologies were synthesized by using dual template [3-(trimethoxysilyl)propyl]octadecyldimethylammonium chloride and diethylamine. Because of its optimal porosity and acidity, hierarchical SAPO-34 exhibited excellent catalytic performance in the MTO reaction.
Silicoaluminophosphate SAPO-34 molecular sieve nanocrystals have been prepared by a post-synthesis milling and recrystallization method, which is further proven to be universally applicable to other SAPO molecular sieves. The obtained SAPO-34 with reduced Si enrichment on the external surface shows considerably improved catalytic performance in the MTO reaction.
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