A defect-based strategy for the preparation of mesoporous zeolite Y for high-performance catalytic cracking
A defect-based strategy for the preparation of mesoporous zeolite Y for high-performance catalytic cracking
复制标题
基于缺陷的高性能催化裂化用介孔Y沸石的制备策略
DOI：
10.1016/j.jcat.2012.11.023
复制
发表时间：
2013-02-01
影响因子：
7.3
通讯作者：
Liu, Honghai
中科院分区：
文献类型：
--
作者：
Qin, Zhengxing;Shen, Baojian;Liu, Honghai
采用脱硅和脱铝相结合的方法制备了具有优异重油裂解性能的介孔超稳定Y型分子筛。报道了脱硅过程中起始NaY分子筛骨架中硅原子的原子去除。研究了脱铝过程中介孔的成核和扩展。硅（0Al）和硅（1Al）原子通过脱硅从沸石骨架中选择性去除。因此，硅烷醇巢和独特的羟基巢与框架相关的Al-OH在脱硅沸石的框架中创建。在原本富含骨架硅且不利于介孔形成的晶体部位，人工缺陷会影响介孔的形成，促进介孔的扩展和聚并。催化研究表明，在1,3,5-三异丙苯裂解过程中，催化活性和寿命有所提高，在重油转化过程中，汽油和轻循环油的选择性有所提高。(C) 2012爱思唯尔公司版权所有。
Mesoporous ultra-stable Y zeolite with outstanding performance for heavy oil cracking was prepared through the combination of desilication and dealumination. Atomic removal of silicon atoms from the starting NaY zeolite framework during desilication was reported. Nucleation and propagation of mesopores in the following dealumination process was studied. Si(0Al) and Si(1Al) atoms are selectively removed from zeolite framework by desilication. Consequently, silanol nests and unique hydroxyl nests with framework associated Al-OH were created in the framework of the desilicated zeolite. The artificial defects effect the initiation of mesopores in crystal parts where used to be rich in framework silicon and unfavorable for mesopore formation and promote the propagation and coalescence of mesopores. Catalytic studies revealed improved activity and lifetime in the crack of 1,3,5-triisopropylbenzene and showed increased gasoline and light cycle oil selectivity when the conversion of a heavy oil was compared. (C) 2012 Elsevier Inc. All rights reserved.