文献类型：期刊文献

英文题名：Study of High-Aluminum-Content Sulfated Zirconia: Influence of Aluminum Content and Washing

作者：Ma, Zhiming[1];Meng, Xuan[1];Yang, Chao[1];Liu, Naiwang[1];Zhang, Yuting[1];Shi, Li[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：56

期号：19

起止页码：5598

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20172403771917);WOS:【SCI-EXPANDED(收录号:WOS:000401781700012)】；

语种：英文

外文关键词：Hexane - Spacecraft instruments - Stretching - Sulfur compounds - Zirconia - Aluminum compounds - Nuclear magnetic resonance spectroscopy - Catalysts - Organic solvents

摘要：A high-aluminum-content sulfated zirconia was prepared by the kneading method, and the washing process was considered as a key factor. Catalysts were characterized by XRD, BET analysis, SEM, TG, FT-IR spectroscopy, pyridine IR spectroscopy, NH3 TPD, H-2 TPR, and Al-27 NMR spectroscopy, and the reactivity was evaluated by n-hexane isomerization. The results showed that the high-aluminum-content sulfated zirconia has a high activity after being washed with water. Moreover, the aluminum content was found to strongly influence the crystal form, catalyst structure, and acidity, as well as the anchoring effect on the labile sulfates. Actually, the higher the aluminum content was, the more sulfates were left in the catalyst samples after washing. The O-H and S=O stretching vibrations were shifted in the presence of aluminum or water. With the support of the aluminum coordination state, a hydrolysis model was deduced for different aluminum contents in the catalysts, and it can explain the formation of more Bronsted acid sites and Al-O-S bonds.