摘要 |
The present invention provides a magnesium modified ultra-stable rare earth Y-type molecular sieve and a preparation method therefor. The method comprises: performing rare earth exchange reaction and dispersion pre-exchange reaction by using an NaY molecular sieve as the raw material, then performing ultra-stable roasting, and finally performing magnesium modification. The molecular sieve contains 0.5%-5% of magnesium oxide by weight, 1%-20% of rare earth oxide by weight, and not greater than 1.2% of sodium oxide by weight, and has the degree of crystallinity being 46%-63% and the cell parameter being 2.454-2.471 nm. Compared with the prior art, the rare earth ions of the molecular sieve prepared through the method are positioned at a sodalite cage, characterized in that no rare earth ion is lost in the counter-exchange process; meanwhile, the particle diameter D (v, 0.5) of the molecular sieve prepared through the method is not greater than 3.0 mum, and the particle diameter D (v, 0.9) is not greater than 20 mum. The molecular sieve has high reliability and desired product selectivity. When the molecular sieve is used as the active component of a catalytic cracking catalyst, high heavy oil conversion capability and high yield of the high-value desired product can be achieved. |
申请人 |
PETROCHINA COMPANY LIMITED;GAO, XIONGHOU;ZHANG, HAITAO;DUAN, HONGCHANG;LIU, CHAOWEI;LI, DI;LI, XUELI;TAN, ZHENGGUO;ZHENG, YUNFENG;HUANG, XIAOLIANG;CAI, JINJUN;ZHANG, CHENXI |
发明人 |
GAO, XIONGHOU;ZHANG, HAITAO;DUAN, HONGCHANG;LIU, CHAOWEI;LI, DI;LI, XUELI;TAN, ZHENGGUO;ZHENG, YUNFENG;HUANG, XIAOLIANG;CAI, JINJUN;ZHANG, CHENXI |