Osastiashtiami, Amin, Lee, Adam F., Granollers, Marta, Brown, D.R., Olivi, Luca, Morales, Gabriel, Melero, Juan A. and Wilson, Karen (2015) Hydrothermally Stable, Conformal, Sulfated Zirconia Monolayer Catalysts for Glucose Conversion to 5-HMF. ACS Catalysis, 5 (7). pp. 4345-4352.
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The grafting and sulfation of zirconia conformal monolayers on SBA-15 to create mesoporous catalysts of tunable solid acid/base character is reported. Conformal zirconia and sulfated zirconia (SZ) materials exhibit both Brönsted and Lewis acidity, with the Brönsted/Lewis acid ratio increasing with film thickness and sulfate content. Grafted zirconia films also exhibit amphoteric character, whose Brönsted/Lewis acid site ratio increases with sulfate loading at the expense of base sites. Bilayer ZrO2/SBA-15 affords an ordered mesoporous material with a high acid site loading upon sulfation and excellent hydrothermal stability. Catalytic performance of SZ/SBA-15 was explored in the aqueous phase conversion of glucose to 5-HMF, delivering a 3-fold enhancement in 5-HMF productivity over nonporous SZ counterparts. The coexistence of accessible solid basic/Lewis acid and Brönsted acid sites in grafted SZ/SBA-15 promotes the respective isomerization of glucose to fructose and dehydration of reactively formed fructose to the desired 5-HMF platform chemical.
|Subjects:||Q Science > QD Chemistry|
|Schools:||School of Applied Sciences > Materials and Catalysis Research Centre
School of Applied Sciences
|Depositing User:||Marta Granollers Mesa|
|Date Deposited:||02 Sep 2015 13:33|
|Last Modified:||06 Dec 2016 06:37|
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