AlNb/SBA‐15 Catalysts with Tunable Lewis and Bronsted Acidic Sites for Glucose Conversion to HMF. Issue 12 (30th March 2018)

• Record Type: Journal Article
• Authors: Wang, Yong; Zhu, Liwei; Zhang, Yuan; Cui, Hongyou; Yi, Weiming; Song, Feng; Zhao, Pingping; Sun, Xiuyu; Xie, Yujiao; Wang, Lihong; Li, Zhihe
• Is Part Of: ChemistrySelect. Volume 3:Issue 12(2018)
• Page Start: 3555
• Page End: 3560
• Publication Date: 2018-03-30
• Subjects: Glucose -- 5-hydroxymethyl furfural (HMF) -- Niobic acid -- Al2O3 -- SBA-15; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201800081
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this paper, a series of AlNb/SBA‐15 catalysts with various Al/Nb atom ratios were prepared by impregnation method for efficient conversion of glucose to 5‐hydroxymethylfurfural (HMF). Characterization by SEM, TEM, BET and XRD showed that the microstructure after impregnation of the active components was preserved, similar to that of SBA‐15, although the pore size and specific surface area decreased to some extent with the increase of Al/Nb atom ratio due to the thickening of the pore wall, which was due to the deposition of the active component salts. Py‐IR and NH3 ‐TPD analysis indicated that AlNb/SBA‐15 had both Bronsted acid sites and Lewis acid sites simultaneously after incorporation of the Al species and they were tunable by adjusting the Al/Nb atom ratio. The catalyst with Al/Nb atom ratio of 2:3 exhibited the suitable strength of Lewis and Bronsted acid and the highest total acid amount, as a result, showing the highest catalytic activity in glucose dehydration to HMF. As high as 55.7% of HMF yield with 93.4% glucose conversion was obtained when reacting at 170 °C for 6.0 h using methyl iso‐butyl ketone (MIBK)/water with a volume ratio of 2 as the reaction media. Abstract : Conversion of glucose to HMF in general undergoes a cascade reaction mechanism, it needs not only Bronsted acid sites but also Lewis acid sites. AlNb/SBA‐15 has both Bronsted acid sites and Lewis acid sites simultaneously after incorporation of the Al species and they are tunable by adjusting the Al/Nb atom ratio.