Calorimetric study of the acidic character of V2O5–TiO2/SO42− catalysts used in methanol oxidation to dimethoxymethane
Calorimetric study of the acidic character of V2O5–TiO2/SO42− catalysts used in methanol oxidation to dimethoxymethane
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DOI：
10.1007/s10973-009-0499-0
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发表时间：
2010-03
影响因子：
4.4
通讯作者：
Hang Zhao;Hang Zhao;S. Bennici;J. Shen;A. Auroux
中科院分区：
文献类型：
--
作者：
Hang Zhao;Hang Zhao;S. Bennici;J. Shen;A. Auroux
The surface acidic properties of sulfated vanadia–titania catalysts prepared by various methods were investigated by adsorption microcalorimetry, using ammonia as probe molecule. The acidic characteristics of the samples were shown to be strongly affected by the preparation method, calcination temperature, and sulfur content. The samples prepared by sol–gel and mechanical grinding exhibited higher acidity than co-precipitated samples. Moreover, increasing the calcination temperature of co-precipitated samples resulted in a decrease in surface area from 402 to 57 m2g−1and sulfur content from around 4 to 0.2 mass%, but up to a certain point generated a stronger acidity. The optimal calcination temperature appeared to be around 673 K.
