Method for in-situ crystallized synthesis of small-grain ZSM-5 molecular sieve by using direct method

The invention provides a method of crystallized preparation of a ZSM-5 molecular sieve in-situ by using a direct method without a template. The method comprises pre-treating high-temperature-roasted kaolin microspheres containing a characteristic structural unit of a five-membered ring by using sodi...

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Main Authors HAO KUN, HU QINGXUN, GAO XIONGHOU, LI DEFU, ZHAO HONGJUAN, XIONG XIAOYUN, QIN SONG, WANG BAOJIE, ZHANG JUNYI, SUN BING, ZHAO XIAOZHENG, LIU HONGHAI, GUO QIAOXIA, SHEN BAOJIAN, ZHANG LI, YUAN RUTING
Format Patent
LanguageChinese
English
Published 21.08.2013
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:The invention provides a method of crystallized preparation of a ZSM-5 molecular sieve in-situ by using a direct method without a template. The method comprises pre-treating high-temperature-roasted kaolin microspheres containing a characteristic structural unit of a five-membered ring by using sodium silicate, adding acid to prepare a reaction mixture, and performing hydrothermal crystallization to obtain in-situ products containing the ZSM-5 molecular sieve and ex-situ ZSM-5 molecular sieve. The kaolin microsphere in-situ crystallized ZSM-5 molecular sieve has a relative crystallinity being capable of being adjusted within 65 % according to requirements, has a crystal size being 0.1-3 [mu]m, is good in wear resistance performance and can be used as a catalytic addictive for increasing propylene yield in a FCC technology. The co-produced ex-situ ZSM-5 molecular sieve has a crystallinity being more than 90 %, and a crystal size of 0.1-3 [mu]m, and can be used for preparing a semi-synthetic catalyst.
Bibliography:Application Number: CN2012135547