Method of in-situ crystallized synthesis of ZSM-5/mordenite compound

• 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
• Language: Chinese; English
• Published: 21.08.2013
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention provides a method of in-situ crystallized synthesis of ZSM-5/mordenite compound by using a direct method without a template. The method comprises pre-treating high-temperature-roasted kaolin microspheres by using sodium silicate, adding acid to prepare a reaction mixture, and performing hydrothermal crystallization to obtain in-situ products containing the ZSM-5/mordenite compound and ex-situ ZSM-5/mordenite composite molecular sieve. The kaolin microsphere in-situ crystallized ZSM-5/mordenite composite molecular sieve prepared by the invention is relatively high in relative crystallinity of the ZSM-5/mordenite, wherein the crystallinity can be adjusted according to requirements, is good in wear resistance performance, and can be used to improve propylene yield in a FCC technology. The co-produced ex-situ ZSM-5/mordenite composite molecular sieve has a crystallinity of the ZSM-5 being more than 80%, and a crystallinity of the mordenite being more than 70 %.