Microfibrous-structured hollow-ZSM-5/SS-fiber catalyst with mesoporosity development dependent lifetime improvement for MTP reaction
Microfibrous-structured hollow-ZSM-5/SS-fiber catalyst with mesoporosity development dependent lifetime improvement for MTP reaction
复制标题
微纤维结构中空 ZSM-5/SS 纤维催化剂，具有介孔发展依赖的 MTP 反应寿命改进
DOI：
10.1016/j.micromeso.2017.10.052
复制
发表时间：
2018-05-01
影响因子：
5.2
通讯作者：
Lu, Yong
中科院分区：
文献类型：
--
作者：
Ding, Jia;Jia, Yingshuai;Lu, Yong
以silicalite-1@ZSM-5/SS-纤维为原料，通过碱浸法制备了一种具有良好应用前景的薄毡状不锈钢纤维结构中空ZSM-5/SS-纤维催化剂。通过浸涂技术获得silicalite-1种子干凝胶/SS-纤维，然后通过种子辅助干凝胶转化法转化为silicalite-1@ZSM-5/SS-纤维（总SiO2/Al 2 O3摩尔比为93）。这种催化剂显示出中孔发展的显著增强，因为在温和的Na 2CO 3介质中通过碱处理除去silicalite-1核后留下了丰富的中空结构。系统考察了碱处理时间对催化剂结构、结构和酸性以及甲醇制丙烯反应性能的影响。所得到的催化剂，具有良好的保持布朗斯台德酸位点后，碱处理，显示中空结构依赖的稳定性改善的MTP和正己烷裂化过程中，由于显着增强的扩散。
A promising thin-felt stainless-steel-fiber (SS-fiber) structured hollow-ZSM-5/SS-fiber catalyst is developed through alkali leaching of the full-silica core from the silicalite-1@ZSM-5/SS-fiber. A silicalite-1 seeded dry-gel/SS-fiber is obtained by dip-coating technique and is then transformed into the silicalite-1@ZSM-5/SS-fiber (overall SiO2/Al2O3 molar ratio of 93) via seed-assisted dry gel conversion method. Such catalyst shows marked enhancement of mesoporosity development because of the abundant hollow structures left behind after the silicalite-1 core removal by alkali treatment in a mild Na2CO3 media. The effect of alkali-treated time length on catalyst structure, textural and acidic properties as well as methanol-to-propylene (MTP) performance is systematically investigated. As-obtained catalyst, with well-maintained Bronsted acid sites after alkali treatment, shows hollow-structure-dependent stability improvement in the MTP and n-hexane cracking processes due to markedly enhanced diffusion.