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摘要
A b-oriented MFI shell was formed on the ZSM-5 crystal by pretreating the core using ammonia prior to the hydrothermal synthesis in tetrapropyl ammonium hydroxide medium. The effect of surface structure of the core material on synthesis of MFI/MFI zeolite was investigated. The surface Si-OH groups and amorphous aluminate may play an important role in forming the b-oriented coating. The shell composition changed from high-silica ZSM-5 to silicalite-1 after twice coating synthesis, while the shell coverage increased from 85% to 99%. In toluene methylation, the silicalite-1 shell not only prevented the deactivation of the catalyst, but also enhanced para-selectivity up to 61%.
- 出版日期2015
- 单位中国石油化工股份有限公司上海石油化工研究院
