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The effect of grafting zirconia and ceria onto alumina as a support for silicotungstic acid for the catalytic dehydration of glycerol to acrolein

Haider, Muhammad, D'Agostino, Carmine, Dummer, Nicholas Frank, Mantle, Mick D., Knight, David, Willock, David, Morgan, David, Taylor, Stuart and Hutchings, Graham 2014. The effect of grafting zirconia and ceria onto alumina as a support for silicotungstic acid for the catalytic dehydration of glycerol to acrolein. Chemistry - a European Journal 20 (6) , pp. 1743-1752. 10.1002/chem.201302348

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Abstract

The effect of ceria and zirconia grafting onto alumina (α and θ–δ phases) as supports for silicotungstic acid for the dehydration of glycerol to acrolein was studied. 30 % Silicotungstic acid (STA) supported on 5 % zirconia/δ,θ-alumina was the best catalyst, producing 85 % selectivity to acrolein at 100 % glycerol conversion, and it showed stable activity without using oxygen as a co-feed. The catalyst produced a STA of 90 g(acrolein) kg(cat)−1 h−1, which was greater than the STA simply supported on δ,θ-alumina, which only demonstrated 75 % selectivity towards acrolein. The effect of grafting on the support material was investigated by means of nitrogen adsorption, ammonia temperature-programmed desorption, thermogravimetric analysis, Raman spectroscopy, and powder X-ray diffraction. A pulsed-field gradient (PFG) NMR technique was also used to study diffusion processes associated with the catalysts. Diffusion studies of the grafted catalysts showed that zirconia contributes to the formation of more tortuous pathways within the pore structure, leading to the diminution of acid strength and making the catalyst less susceptible to coke formation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: acrolein; glycerol; heterogeneous catalysis; NMR spectroscopy; silicotungstic acid
Publisher: Wiley-Blackwell
Last Modified: 18 Mar 2019 21:27
URI: http://orca.cf.ac.uk/id/eprint/66164

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