The Role of Tungsten Oxide Species Supported on Titania Catalysts for the Synthesis of Glycerol Carbonate from Glycerol and Urea
A series of WO 3 supported on TiO 2 catalysts were prepared by impregnation method with varying WO 3 content. The prepared catalysts were characterized by FT-IR, Laser Raman, X-ray diffraction, BET surface area and temperature programmed desorption of NH 3 . X-ray diffraction and Laser Raman spectro...
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Published in | Catalysis letters Vol. 146; no. 3; pp. 692 - 700 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.03.2016
Springer Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | A series of WO
3
supported on TiO
2
catalysts were prepared by impregnation method with varying WO
3
content. The prepared catalysts were characterized by FT-IR, Laser Raman, X-ray diffraction, BET surface area and temperature programmed desorption of NH
3
. X-ray diffraction and Laser Raman spectroscopic results suggest that WO
3
was highly dispersed on titania up to 15 wt%. Acidity of the catalyst depended up on WO
3
loading on titania and calcination temperature. The catalyst with 15 % WO
3
content calcined at 500 °C exhibited high surface area and high acidity. Activity of the catalysts was evaluated for the synthesis of glycerol carbonate from glycerol and urea. The catalytic activity results showed that 15 % WO
3
supported on TiO
2
exhibited about 73 % glycerol conversion with near 100 % selectivity for glycerol carbonate. The influence of support on glycerol conversion was also studied and activities for different supports were in the order of TiO
2
> SiO
2
> MoO
3
> Nb
2
O
5
> ZrO
2
> Al
2
O
3
. Different reaction parameters were also studied and optimum conditions were established. The catalyst is reusable without considerable loss in activity.
Graphical Abstract |
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ISSN: | 1011-372X 1572-879X |
DOI: | 10.1007/s10562-016-1694-9 |