- 专利标题： COMPOSITE ZSM-5 MOLECULAR SIEVE, PREPARATION METHOD THEREFOR, CATALYST AND USE THEREOF
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申请号： US17642070申请日： 2020-04-10
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公开(公告)号： US20230132229A1公开(公告)日： 2023-04-27
- 发明人: Xin HUANG , Yufei ZHU , Chuanfu WANG
- 申请人： China Energy Investment Corporation Limited , National Institute of Clean-and-Low-Carbon Energy
- 申请人地址： CN Beijing; CN Beijing
- 专利权人： China Energy Investment Corporation Limited,National Institute of Clean-and-Low-Carbon Energy
- 当前专利权人： China Energy Investment Corporation Limited,National Institute of Clean-and-Low-Carbon Energy
- 当前专利权人地址： CN Beijing; CN Beijing
- 优先权： CN201910859731.4 20190911
- 国际申请： PCT/CN2020/084201 WO 20200410
- 主分类号： B01J29/40
- IPC分类号： B01J29/40 ; B01J35/10 ; B01J37/04 ; B01J37/00 ; B01J37/03 ; B01J37/08 ; B01J37/02 ; C07C2/86
摘要：
The present invention relates to the field of alkylation catalysts, and disclosed are a composite ZSM-5 molecular sieve, a preparation method therefor, a catalyst and an application thereof. A single crystal of the composite ZSM-5 molecular sieve comprises a main crystal and a twin crystal; the main crystal and the twin crystal are both ZSM-5 crystals; a crystal plane [010] of the main crystal is covered by a crystal plane [100] of the twin crystal; and the ratio of the number of sinusoidal pore openings to the number of straight pore openings on the outer surface of the single crystal of the composite ZSM-5 molecular sieve is (0.7-10:1), and the molar ratio Y1 of an Si element to an Al element within 10 nm of the surface is (300-2000):1. The single crystal of the composite ZSM-5 molecular sieve of the present invention has a large ratio of the number of sinusoidal pore openings to the number of straight pore openings, and is aluminum-poor on the surface and aluminum-rich on the inside. When applied to the toluene methanol alkylation reaction to prepare p-xylene, the selectivity of p-xylene may be greatly improved.