Mesoporous Y zeolite with homogeneous aluminum distribution obtained by sequential desilication–dealumination and its performance in the catalytic cracking of cumene and 1,3,5-triisopropylbenzene
Mesoporous Y zeolite with homogeneous aluminum distribution obtained by sequential desilication–dealumination and its performance in the catalytic cracking of cumene and 1,3,5-triisopropylbenzene
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序贯脱硅脱铝制备的铝分布均匀的介孔Y型沸石及其在异丙苯和1,3,5-三异丙苯催化裂化中的性能
DOI：
10.1016/j.jcat.2010.12.013
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发表时间：
2011-03
影响因子：
7.3
通讯作者：
中科院分区：
文献类型：
--
作者：
对经NaOH脱硅和六氟硅酸铵（AHFS）脱铝法制备的Y分子筛的铝硅分布和介孔率与仅经AHFS脱铝法制备的Y分子筛进行了比较。AHFS处理导致严重的不均匀脱铝和大量的表面硅沉积。通过顺序脱硅和脱铝得到的Y样品具有较好的脱铝均匀性和铝硅分布。详细讨论了这些沸石的中孔形成过程。脱硅会在母体NaY分子筛的框架中产生缺陷。这些缺陷在脱铝过程中改善了晶内输运并诱导了介孔的形成。脱硅加脱铝处理后的沸石在1,3,5-三异丙苯裂解条件下具有较高的初始活性和较低的失活倾向，异丙烯转化率高于单纯经AHFS处理的沸石。这些催化数据表明，前者是一种可行的重质烃催化裂化催化剂。
The aluminum–silicon distribution and mesoporosity of Y zeolites prepared by sequential NaOH desilication and ammonium hexafluorosilicate (AHFS) dealumination are compared with that of Y samples prepared via AHFS dealumination only. AHFS treatment led to severe non-uniform dealumination and substantial surface silicon deposition. Y samples obtained by sequential desilication and dealumination had substantially better dealumination uniformity and aluminum–silicon distribution. The mesopore formation in these zeolites is discussed in detail. The desilication creates defects in the framework of the parent NaY zeolite. These defects improve the intra-crystalline transport and induce mesopore formation during dealumination. The desilication- plus dealumination-treated zeolites showed higher initial activity and lower deactivation tendency in the case of 1,3,5-triisopropylbenzene cracking, and higher conversion rate of cumene than those zeolites modified by AHFS treatment only. These catalytic data indicate that the former could be a viable catalyst in the catalytic cracking of heavy hydrocarbons.
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影响因子：
5.3
作者：
H. Kao;Yun-Chu Chen;Chun-Chiang Ting;Po Tuan Chen;Jyh‐Chiang Jiang
通讯作者：
H. Kao;Yun-Chu Chen;Chun-Chiang Ting;Po Tuan Chen;Jyh‐Chiang Jiang
影响因子：
5.5
作者：
I. Kiricsi
通讯作者：
I. Kiricsi
影响因子：
15
作者：
Groen, Johan C.;Zhu, Weidong;Perez-Ramirez, Javier
通讯作者：
Perez-Ramirez, Javier
影响因子：
7.3
作者：
Liang Zhao;B. Shen;Jinsen Gao;Chunming Xu
通讯作者：
Liang Zhao;B. Shen;Jinsen Gao;Chunming Xu
影响因子：
7.3
作者：
R. López-Fonseca;J. I. Gutiérrez-Ortiz;M. A. Gutiérrez-Ortiz;J. González-Velasco
通讯作者：
R. López-Fonseca;J. I. Gutiérrez-Ortiz;M. A. Gutiérrez-Ortiz;J. González-Velasco