Influence of Preparation Conditions on the Acidity of WO3/ZrO2 Solid Superacid

Ping Xu; Min Wei Wang; Jia Wei Qu; Ren Lang Wang; Jian Wang

doi:10.4028/www.scientific.net/AMR.233-235.1502

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 233-235Influence of Preparation Conditions on the Acidity...

Influence of Preparation Conditions on the Acidity of WO₃/ZrO₂ Solid Superacid

Abstract:

WO₃/ZrO₂ solid superacid catalysts were prepared by coprecipitation and impregnation, then were characterized by XRD, N₂ adsorption-desorption, Hammett indicator and pyridine chemisorption IR. The acid strength, acid type, acid volume, etc were compared under the different preparation conditions. The results indicated that the catalyst prepared by coprecipitation had stronger acid strength than the catalyst prepared by impregnation. The samples prepared by impregnation had more Lewis acid sites. With the increasing of the W/Zr ratio, the acid strength tended to increase at first and then decrease, and the catalyst with 10% WO₃ loading amount had the strongest acidity. The higher the calcination temperature, the less the Lewis acid sites.

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Periodical:

Advanced Materials Research (Volumes 233-235)

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1502-1506

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https://doi.org/10.4028/www.scientific.net/AMR.233-235.1502

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Online since:

May 2011

Authors:

Ping Xu, Min Wei Wang, Jia Wei Qu, Ren Lang Wang, Jian Wang

Keywords:

Acid Strength, Solid Acid, WO₃/ZrO₂

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