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

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

Authors :
Yuting Zhang
Chao Yang
Naiwang Liu
Li Shi
Xuan Meng
Zhiming Ma
Source :
Industrial & Engineering Chemistry Research. 56:5598-5606
Publication Year :
2017
Publisher :
American Chemical Society (ACS), 2017.

Abstract

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, H2 TPR, and 27Al 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...

Details

ISSN :
15205045 and 08885885
Volume :
56
Database :
OpenAIRE
Journal :
Industrial & Engineering Chemistry Research
Accession number :
edsair.doi...........ebe1989b95d2fa15b450db7fb965ca12
Full Text :
https://doi.org/10.1021/acs.iecr.7b00832