Influence of calcination temperature on the water-resistant stability 
of SO2-4/TiO2 solid superacid

doi:10.3969/j.issn.1000-2006.2016.06.020

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 59 ›› Issue (06): 129-134.doi: 10.3969/j.issn.1000-2006.2016.06.020

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Influence of calcination temperature on the water-resistant stability of SO^2-₄/TiO₂ solid superacid

LI Licheng¹, HU Di¹, ZHAO Xuejuan², QIAN Qi¹, WANG Lei¹, SONG Shanshan¹, YU Sifan¹, YAN Jun¹, LI Xiaobao¹

1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;
2. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Online:2016-12-18 Published:2016-12-18

Abstract

Abstract: A water pretreatment method was used to evaluate the water-resistant stability of SO^2-₄/TiO₂ solid superacid prepared by calcination under different temperatures. The structural properties of samples were characterized by the X-ray diffraction(XRD), NH₃-TPD, fourier transform-infrared(FT-IR)spectroscopy, thermogravimetric(TG)analysis, and BET surface area analysis. The results showed that, when the calcination temperature did not exceed 500 ℃, the obtained SO^2-₄/TiO₂ solid superacid had similar esterification performances. However, the pore structure of solid superacid collapsed and its SO^2-₄ content decreased when the calcination temperature exceeded 600 ℃. In this case, the esterification performance of the solid superacid was poor. After the water pretreatment, the esterification performances of all solid superacids descended, which was mainly attributed to the removal of SO^2-₄ and the decrease of acid amount. In a comparison, SO^2-₄/TiO₂ solid superacid prepared at a calcination temperature of 400 ℃ had the optimum water-resistant stability.

CLC Number:

TQ 032.4

LI Licheng, HU Di, ZHAO Xuejuan, QIAN Qi, WANG Lei, SONG Shanshan, YU Sifan, YAN Jun, LI Xiaobao. Influence of calcination temperature on the water-resistant stability of SO^2-₄/TiO₂ solid superacid[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2016, 59(06): 129-134.

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Influence of calcination temperature on the water-resistant stability of SO^2-₄/TiO₂ solid superacid

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