期刊
MOLECULAR CATALYSIS
卷 510, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mcat.2021.111686
关键词
Biomass; Glucose isomerization; Fructose; Y zeolite structures; Alkaline-treatment
资金
- Chinese Scholarship Council [201809505002]
- Department of Chemistry, Technical Univer-sity of Denmark
- Department of Biotechnology, Gov-ernment of India
- Villum Foundation
Commercial Y zeolites can be modified by alkaline treatment to create new mesoporous structures and increase tetrahedral extra-framework acidic aluminum, significantly improving the efficiency of catalyzing glucose isomerization to fructose.
Isomerization of glucose to fructose is a key reaction step in the efficient production of valuable renewable chemical intermediates from biomass. Zeolites have been widely used to promote glucose isomerization, but only limited structure-activity relationship has been established and applied to optimize the reaction. In this work, commercial Y zeolites were modified by alkaline-treatment and their physicochemical properties and structures were correlated in order to optimize the catalytic performance for glucose isomerization. For H-Y, the alkalinetreatment developed new mesoporous structures with larger pore, modified the Si-O(H)-Al bonds and extracted silica from framework structures creating more tetrahedral extra-framework Lewis acidic aluminum. This increased the isomerization selectivity towards fructose more than twelve times and decreased significantly acetalization/ketalization side reactions compared to the pristine zeolite. In contrast, Na-Y contained mainly micropores and had less tetrahedral non-framework acidic Al-species, resulting in low glucose conversion and low fructose yield due to limited substrate accessibility to the pores, although the number of acid sites was tenfold higher than in H-Y. The study demonstrates how commercial Y zeolites can be designed by alkalinetreatment to comprise mesopores and weak acid sites, which greatly improve the catalytic performance for glucose isomerization to fructose.
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