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Title:
ZSM-23 MOLECULAR SIEVE AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/148424
Kind Code:
A1
Abstract:
Provided are a ZSM-23 molecular sieve, a preparation method therefor, and an alkali-treated amorphous silicon dioxide serving as a silicon source in the preparation method for the ZSM-23 molecular sieve. The pore volume of the mesoporous having a pore size of 3-8 nm in the molecular sieve accounts for 45-90% of the total pore volume of the molecular sieve. The relative crystallinity is 95-120%, and the retention of the relative crystallinity after hydrothermal treatment for 2 hours with 600°C water steam is 95-100%. The preparation method for the molecular sieve comprises the following steps: (1) preparing or selecting the silicon source, for example, amorphous silicon dioxide, for preparing the ZSM-23 molecular sieve; (2) alkali-treating the silicon source amorphous silicon dioxide used for preparing the ZSM-23 molecular sieve in step (1); and (3) preparing the ZSM-23 molecular sieve by using the amorphous silicon dioxide after the alkali treatment as the silicon source. The ZSM-23 molecular sieve has abundant mesoporous structures and good hydrothermal stability.

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Inventors:
CHEN YUJING (CN)
FAN HONGFEI (CN)
YU ZHENGMIN (CN)
SUN XIAOYAN (CN)
Application Number:
PCT/CN2022/070678
Publication Date:
July 14, 2022
Filing Date:
January 07, 2022
Export Citation:
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Assignee:
CHINA PETROLEUM & CHEM CORP (CN)
SINOPEC DALIAN RES INSTITUTE OF PETROLEUM AND PETROCHEMICALS CO LTD (CN)
International Classes:
C01B39/04; C01B33/113
Foreign References:
CN85107676A1986-06-10
CN105540607A2016-05-04
CN107235497A2017-10-10
CN1332114A2002-01-23
CN104129800A2014-11-05
CN103818912A2014-05-28
US20100098623A12010-04-22
CN106513035A2017-03-22
CN107235497A2017-10-10
US4076842A1978-02-28
US5405596A1995-04-11
US5707601A1998-01-13
US7157075B12007-01-02
CN105540607A2016-05-04
Other References:
ROHRMAN JR, A. C.: "The framework topology of ZSM-23: A high silica zeolite", ZEOLITES, vol. 5, no. 6, 1985, pages 352 - 354
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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