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Acid-activated and WOx-loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration

Weihua Yu, Pengpeng Wang, Chunhui Zhou*, Hanbin Zhao, Dongshen Tong, Hao Zhang, Huimin Yang, Shengfu Ji, Hao Wang. Acid-activated and WOx-loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration. Chinese Journal of Catalysis, 2017, 38 (6): 1087-1100.
 
Abstract:
 The use of HSO, HCl, HPO, and CHCOOH-activated montmorillonite (Mt) and WO/HPOactivated Mt as catalysts for the gas-phase dehydration of glycerol was investigated. The WO/HPOactivated Mt catalysts were prepared by an impregnation method using HPOactivated Mt (Mt-P) as the support. The catalysts were characterized using powder X-ray diffraction, Fourier-transform infrared spectroscopy, Nadsorption-desorption, diffuse reflectance ultraviolet-visible spectroscopy, temperature-programmed desorption of NH, and thermogravimetric analysis. The acid activation of Mt and WOloaded on Mt-P affected the strength and number of acid sites arising from Hexchange, the leaching of octahedral Alcations from Mt octahedral sheets, and the types of WO(2.7 ≤ ≤ 3) species (i.e., isolated WO/WOcontaining clusters, two-dimensional [WO] polytungstates, or three-dimensional WOcrystals). The strong acid sites were weakened, and the weak and medium acid sites were strengthened when the W loading on Mt-P was 12 wt% (12%W/Mt-P)The 12%W/Mt-P catalyst showed the highest catalytic activity. It gave a glycerol conversion of 89.6% and an acrolein selectivity of 81.8% at 320 ℃. Coke deposition on the surface of the catalyst led to deactivation.

Link:
https://www.sciencedirect.com/science/article/pii/S1872206717628134

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