Cerium modified Y/SBA-15 composite molecular sieve catalyzed synthesis of n-butyl acetate

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• 作者：Chunwei SHI (史春薇)^a ; ^b ; Wenyuan WU (吴文远)^b ; ^{wuwy@smm.neu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xue BIAN (边 雪)^b ; Mingyuan PEI (裴明远)^c ; Shanlin ZHAO (赵杉林)^a ; Ping CHEN (陈 平)^a
• 关键词：Ce-modification ; microporous-mesoporous composite molecular sieves ; catalyst ; n-butyl acetate ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：34
• 期：6
• 页码：597-603
• 全文大小：1058 K

文摘

A novel Ce-Y/SBA-15 catalyst was prepared by modifying HY/SBA-15 microporous-mesoporous composite molecular sieve with cerium using the impregnation method. The characterization results from scanning electron microscopy/energy dispersive X-ray dispersive spectroscopy (SEM/EDS), transmission electron microscopy (TEM), and X-ray fluorescence (XRF) studies indicated that the Ce-modified catalyst maintained the microporous-mesoporous structure of Y/SBA-15. The Ce ions were found to be uniformly dispersed in the pores of the molecular sieve without aggregation. The results from pyrolysis coupled-Fourier transform infrared spectroscopy (Pyridine-FTIR) and temperature programmed desorption of ammonia (NH₃-TPD) showed that the loading of cerium caused the hydroxyl group in the catalyst to display stronger Bronsted acidity. The efficiency of the modified Ce-Y/SBA-15 catalyst was evaluated by using it to catalyze the synthesis of n-butyl acetate. The optimal synthesis conditions were determined by orthogonal experiments. The highest esterification yield of 94.4% was obtained when the reaction time was 2.0 h, with acid/alcohol molar ratio of 1:1.2, and catalyst loading of 10 wt.%. The results in this study demonstrated that the loading of cerium and the structure of Y/SBA-15 microporous-mesoporous composite molecular sieve helped in improving the catalytic activity of this acidic catalyst.