Preparation and characterization of SO42-/TiO2 and S2O82-/TiO2 catalysts

MA Xuedan1, GUO Daishi1, JIANG Qizhong1, MA Zifeng1, MA Zhengfei2, YE Weidong3, LI Chunbo3

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Front. Chem. Sci. Eng. All Journals
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Front. Chem. Sci. Eng. ›› 2007, Vol. 1 ›› Issue (1) : 45-49. DOI: 10.1007/s11705-007-0009-5

Preparation and characterization of SO42-/TiO2 and S2O82-/TiO2 catalysts

  • MA Xuedan1, GUO Daishi1, JIANG Qizhong1, MA Zifeng1, MA Zhengfei2, YE Weidong3, LI Chunbo3
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Abstract

Nanosized solid superacids SO42-/TiO2 and S2O82-/TiO2, as well as MCM-41-supported SO42-/ZrO2, were prepared. Their structures, acidities, and catalytic activities were investigated and compared using XRD, N2 adsorption-desorption, and in situ FTIR-pyridine adsorption, as well as an evaluation reaction with pseudoionone cyclization. The results showed that SO42-/TiO2 and S2O82-/TiO2 possess not only nanosized particles with diameters <7.0 nm, a BET surface greater than 140 cm2/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 SO42-/ZrO2/MCM-41, SO42-/TiO2 and S2O82-/TiO2 exhibit mainly Br¢nsted acidities. The strongest Br¢nsted acid sites were produced on SO42-/TiO2 promoted with H2SO4, while Lewis acid sites on S2O82-/TiO2 even stronger than those on SO42-/ZrO2/MCM-41 were generated when persulfate solution was used as sulfating agent. Because of their distinct acid natures, SO42-/TiO2 and S2O82-/TiO2 exhibited catalytic activities for the cyclization of pseudoionone that were much higher than that of SO42-/ZrO2/MCM-41. It can be concluded that the existence of more Br¢nsted acid sites was favorable for proton participation in the cyclization reaction.

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MA Xuedan, GUO Daishi, JIANG Qizhong, MA Zifeng, MA Zhengfei, YE Weidong, LI Chunbo. Preparation and characterization of SO42-/TiO2 and S2O82-/TiO2 catalysts. Front. Chem. Sci. Eng., 2007, 1(1): 45‒49 https://doi.org/10.1007/s11705-007-0009-5
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