High-performance thin-felt SS-fiber@HZSM-5 catalysts synthesized via seed-assisted vapor phase transport for methanol-to-propylene reaction: Effects of crystal size, mesoporosity and aluminum uniformity
High-performance thin-felt SS-fiber@HZSM-5 catalysts synthesized via seed-assisted vapor phase transport for methanol-to-propylene reaction: Effects of crystal size, mesoporosity and aluminum uniformity
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通过种子辅助气相传输合成的高性能薄毡SS-纤维@HZSM-5催化剂用于甲醇制丙烯反应：晶体尺寸、介孔率和铝的影响
DOI：
10.1016/j.jcat.2018.01.025
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发表时间：
2018-04
影响因子：
7.3
通讯作者：
Yong Lu
中科院分区：
文献类型：
--
作者：
Jia Ding;Pengjing Chen;Guofeng Zhao;Ye Liu;Yong Lu
采用晶种辅助气相传输法（VPT）制备了一系列薄毡状SS-fiber@HZSM-5催化剂。沸石壳的晶体尺寸和介孔性通过增加硅沸石-1晶种凝胶（SG）的用量而可控地调节朝向增强的扩散。以50%的高SG量获得的微结构化催化剂含有小于70 nm的较小晶体尺寸和0.21 cm 3 g沸石-1的较高中孔体积，这显著延长了单次运行寿命，并显著降低了MTP方法中的焦化速率。揭示了沸石壳层中铝的不均匀性对MTP稳定性的不利影响。用含铝SG代替纯硅SG，使负载在SS纤维上的ZSM-5分子筛的酸中心分布均匀，从而显著抑制了氢转移，使催化剂的单次使用寿命提高了约40%。这种有前途的SS-fiber@HZSM-5催化剂稳定至少1600 h（>94% conv.）在450 °C下，当甲醇/水摩尔比为1：1时，WHSV为1 h− 1，丙烯选择性高达36%，这得益于中孔发展带来的扩散改善、铝分布均匀以及我们独特的微纤维工程设计。
A series of thin-felt SS-fiber@HZSM-5 catalysts are fabricated via the seed-assisted vapor-phase transport (VPT) method. The crystal size and mesoporosity of zeolite shell are controllably tuned toward enhanced diffusion by increasing the silicalite-1 seeding gel (SG) amount used. The microstructured catalyst obtained with a high SG amount of 50% contains a smaller crystal size of ∼70 nm and higher mesopore volume of 0.21 cm3gzeolite−1, which markedly prolonged single-run lifetime with a remarkable decrease in the coking rate in the MTP process. The adverse effect of non-uniform aluminum in the zeolite shell on the MTP stability is revealed. The use of aluminum-containing SG to replace the pure-silica one makes the acid sites of as-obtained ZSM-5 mounted on SS-fiber distributed homogeneously thereby leading to a marked suppression of hydrogen transfer, and as a result, the catalyst single-run lifetime is further increased by ∼40%. This promising SS-fiber@HZSM-5 catalyst is stable for at least 1600 h (>94% conv.) with a high propylene selectivity of ∼36% at 450 °C using a WHSV of 1 h−1for a feed of MeOH/H2O molar ratio of 1:1, by taking advantage of improved diffusion from mesoporosity development and uniform aluminum distribution as well as our distinctive microfibrous-engineered design.
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影响因子：
4.9
作者：
Xiangyu Wang;M. Wen;Chunzheng Wang;Jianghong Ding;Ying Sun;Ye Liu;Yong Lu
通讯作者：
Xiangyu Wang;M. Wen;Chunzheng Wang;Jianghong Ding;Ying Sun;Ye Liu;Yong Lu
通过原位结晶在简单用 TiO2 修饰的粗糙表面上合成高度 b 取向的 ZSM-5 膜
影响因子：
5.2
作者：
Ji, Meiling;Liu, Guozhu;Chen, Chen;Wang, Li;Zhang, Xiangwen
通讯作者：
Zhang, Xiangwen
使用聚乙二醇或胶体silicalite-1晶种快速调节ZSM-5晶体尺寸
影响因子：
5.2
作者：
Feng Xu;Mei Dong;Weiyong Gou;Junfen Li;Zhangfeng Qin;Jianguo Wang;Weibin Fan
通讯作者：
Weibin Fan
影响因子：
5.2
作者：
Qingjun Yu;Xiaojing Meng;Jianwei Liu;Chunyi Li;Qiukai Cui
通讯作者：
Qingjun Yu;Xiaojing Meng;Jianwei Liu;Chunyi Li;Qiukai Cui
影响因子：
9.8
作者：
Qing Zhang;Si Hu;Lanlan Zhang;Zhijie Wu;Yanjun Gong;T. Dou
通讯作者：
Qing Zhang;Si Hu;Lanlan Zhang;Zhijie Wu;Yanjun Gong;T. Dou