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

Yu, Weihua and Wang, Pengpeng and Zhou, Chunhui and Zhao, Hanbin and Tong, Dongshen and Zhang, Hao and Yang, Huimin and Ji, Shengfu and Wang, Hao (2017) Acid‐activated and WOx‐loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration. Chinese Journal of Catalysis, 38 (6). pp. 1087-1100. ISSN 0253-9837


Abstract

Acid-activated and WOx-loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration The use of H2SO4-, HCl-, H3PO4-, and CH3COOH-activated montmorillonite (Mt) and WOx/H3PO4-activated Mt as catalysts for the gas-phase dehydration of glycerol was investigated. The WOx/H3PO4-activated Mt catalysts were prepared by an impregnation method using H3PO4-activated Mt (Mt-P) as the support. The catalysts were characterized using powder X-ray diffraction, Fourier-transform infrared spectroscopy, N2 adsorption-desorption, diffuse reflectance ultraviolet-visible spectroscopy, temperature-programmed desorption of NH3, and thermogravimetric analysis. The acid activation of Mt and WOx loaded on Mt-P affected the strength and number of acid sites arising from H+ exchange, the leaching of octahedral Al3+ cations from Mt octahedral sheets, and the types of WOx (2.7 ≤ x ≤ 3) species (i.e., isolated WO4/WO6-containing clusters, two-dimensional [WO6] polytungstates, or three-dimensional WO3 crystals). 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 03 Mar 2022 04:00
Last Modified: 28 Apr 2022 02:57
Uncontrolled Keywords: Acid-activated nanoclay; Acrolein; Catalyst; Dehydration; Glycerol; WOx
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1016/S1872-2067(17)62813-4
URI: http://eprints.usq.edu.au/id/eprint/46462

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