NDLI: Preparation and characterization of SO$_{4}$ $^{2−}$/TiO$_{2}$ and S$_{2}$O$_{8}$ $^{2−}$/TiO$

Content Provider	Springer Nature Link
Author	Ma, Xuedan Guo, Daishi Jiang, Qizhong Ma, Zifeng Ma, Zhengfei Ye, Weidong Li, Chunbo
Copyright Year	2007
Abstract	Nanosized solid superacids SO$_{4}$ $^{2−}$/TiO$_{2}$ and S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$, as well as MCM-41-supported SO$_{4}$ $^{2−}$/ZrO$_{2}$, were prepared. Their structures, acidities, and catalytic activities were investigated and compared using XRD, N$_{2}$ adsorption-desorption, and in situ FTIR-pyridine adsorption, as well as an evaluation reaction with pseudoionone cyclization. The results showed that SO$_{4}$ $^{2−}$/TiO$_{2}$ and S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$ possess not only nanosized particles with diameters < 7.0 nm, a BET surface greater than 140 cm$^{2}$/g and relatively regular mesostructures with pores around 4.0 nm, but also a pure anatase phase and strong acidity. Different from the Lewis acid nature of SO$_{4}$ $^{2−}$/ZrO$_{2}$/MCM-41, SO$_{4}$ $^{2−}$/TiO$_{2}$ and S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$ exhibit mainly Bronsted acidities. The strongest Bronsted acid sites were produced on SO$_{4}$ $^{2−}$/TiO$_{2}$ promoted with H$_{2}$SO$_{4}$, while Lewis acid sites on S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$ even stronger than those on SO$_{4}$ $^{2−}$/ZrO$_{2}$/MCM-41 were generated when persulfate solution was used as sulfating agent. Because of their distinct acid natures, SO$_{4}$ $^{2−}$/TiO$_{2}$ and S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$ exhibited catalytic activities for the cyclization of pseudoionone that were much higher than that of SO$_{4}$ $^{2−}$/ZrO$_{2}$/MCM-41. It can be concluded that the existence of more Brønsted acid sites was favorable for proton participation in the cyclization reaction.
Starting Page	45
Ending Page	49
Page Count	5
File Format	PDF
ISSN	16737369
Journal	Frontiers of Chemical Engineering in China
Volume Number	1
Issue Number	1
e-ISSN	16737474
Language	English
Publisher	Higher Education Press
Publisher Date	2007-01-01
Publisher Institution	Chinese Universities
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	solid superacid SO$_{4}$ $^{2−}$/TiO$_{2}$ S$_{2}$O$_{8}$ $^{2−}$/TiO$_{2}$ ionone cyclization Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering

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