Title:
COMPOSITE ZSM-5 MOLECULAR SIEVE, PREPARATION METHOD THEREFOR, CATALYST AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/047171
Kind Code:
A1
Abstract:
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.
Inventors:
HUANG XIN (CN)
ZHU YUFEI (CN)
WANG CHUANFU (CN)
ZHU YUFEI (CN)
WANG CHUANFU (CN)
Application Number:
PCT/CN2020/084201
Publication Date:
March 18, 2021
Filing Date:
April 10, 2020
Export Citation:
Assignee:
CHINA ENERGY INVESTMENT CORP LTD (CN)
NAT INST CLEAN & LOW CARBON ENERGY (CN)
NAT INST CLEAN & LOW CARBON ENERGY (CN)
International Classes:
B01J35/10; B01J29/40; C07C2/86; C07C6/12; C07C15/08
Foreign References:
| CN111111748A | 2020-05-08 | |||
| CN105883849A | 2016-08-24 | |||
| CN103936026A | 2014-07-23 | |||
| CN108751222A | 2018-11-06 | |||
| JP2003292462A | 2003-10-15 |
Attorney, Agent or Firm:
RUNPING & PARTNERS (CN)
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