Development of the CON-type Aluminosilicate Zeolite and Its Catalytic Application for the MTO Reaction

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• 作者：Masato Yoshioka ; Toshiyuki Yokoi ; Takashi Tatsumi
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：July 2, 2015
• 年：2015
• 卷：5
• 期：7
• 页码：4268-4275
• 全文大小：504K
• ISSN：2155-5435

文摘

The CON-type aluminosilicate zeolites, which consist of a three-dimensional pore system with 12-, 12-, and 10-membered ring pores have been prepared by postsynthesis and the newly developed direct-synthesis methods. We first found that the CON-type aluminosilicate zeolites exhibited a higher catalytic performance in the methanol to olefins (MTO) reaction in terms of duration and propene selectivity than the MFI and *BEA-type aluminosilicate zeolites. They exhibited high propene selectivity, low ethene selectivity, and a very long catalytic life compared to Beta and ZSM-5; the selectivity for C3鈥揅4 olefins reached 80%. Interestingly, the CON-type aluminosilicate zeolite synthesized by the direct-synthesis method showed a much longer catalytic lifetime than the one obtained by the postsynthesis method. The ²⁷Al MAS and ²⁷Al MQMAS NMR spectra suggest that there is a significant difference in the state of tetrahedrally coordinated Al species between the directly and postsynthesized zeolites, leading to the marked difference in the catalytic performance.