AlNb/SBA-15 Catalysts with Tunable Lewis and Bronsted Acidic Sites for Glucose Conversion to HMF
AlNb/SBA-15 Catalysts with Tunable Lewis and Bronsted Acidic Sites for Glucose Conversion to HMF
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具有可调节路易斯和布朗斯台德酸性位点的 AlNb/SBA-15 催化剂，用于将葡萄糖转化为 HMF
DOI：
10.1002/slct.201800081
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发表时间：
2018
期刊：
影响因子：
2.1
通讯作者：
Li Zhihe
中科院分区：
文献类型：
--
作者：
Wang Yong;Zhu Liwei;Zhang Yuan;Cui Hongyou;Yi Weiming;Song Feng;Zhao Pingping;Sun Xiuyu;Xie Yujiao;Wang Lihong;Li Zhihe
采用浸渍法制备了一系列不同Al/Nb原子比的AlNb/SBA-15催化剂，用于葡萄糖高效转化为5-羟甲基糠醛（HMF）。SEM、TEM、BET和XRD表征结果表明，活性组分浸渍后的微观结构与SBA-15相似，但孔径和比表面积随着Al/Nb原子比的增加而有所减小，这是由于活性组分盐的沉积导致孔壁增厚。Py‐IR和NH3‐TPD分析表明，AlNb/SBA-15在引入Al物种后同时具有Bronsted酸中心和刘易斯酸中心，并且它们可以通过调节Al/Nb原子比来调节。当Al/Nb原子比为2：3时，催化剂的刘易斯酸和布朗斯台德酸强度最大，总酸量最高，对葡萄糖脱水制HMF的催化活性最高。当使用体积比为2的甲基异丁基酮（MIBK）/水作为反应介质在170 °C下反应6.0小时时，获得高达55.7%的HMF产率和93.4%的葡萄糖转化率。
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.