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Deactivation of Sn-Beta during carbohydrate conversion
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2018-07-21 , DOI: 10.1016/j.apcata.2018.07.023
William N.P. van der Graaff , Christiaan H.L. Tempelman , Frank C. Hendriks , Javier Ruiz-Martinez , Sara Bals , Bert M. Weckhuysen , Evgeny A. Pidko , Emiel J.M. Hensen

The deactivation of Sn-Beta zeolite catalyst during retro-aldolization and isomerization of glucose is investigated. Confocal fluorescence microscopy reveals that retro-aldolization of glucose in CH3OH at 160 °C is accompanied with the build-up of insoluble oligomeric deposits in the micropores, resulting in a rapid catalyst deactivation. These deposits accumulate predominantly in the outer regions of the zeolite crystals, which points to mass transport limitations. Glucose isomerization in water is not only accompanied by the formation of insoluble deposits in the micropores, but also by the structural degradation of the zeolite due to desilication and destannation. Enhanced and sustained catalytic performance can be achieved by using ethanol/water mixtures as the reaction solvent instead of water.



中文翻译:

碳水化合物转化过程中Sn-β的失活

研究了葡萄糖的逆醛醇缩合和异构化过程中Sn-β沸石催化剂的失活。共聚焦荧光显微镜显示,在160°C的CH 3 OH中,葡萄糖的逆醛醇缩合伴随微孔中不溶性低聚物沉积物的积累,导致催化剂快速失活。这些沉积物主要聚集在沸石晶体的外部区域,这表明了传质的局限性。水中的葡萄糖异构化不仅伴随着微孔中不溶性沉积物的形成,还伴随着由于脱硅和脱锡而导致的沸石的结构降解。通过使用乙醇/水混合物代替水作为反应溶剂,可以实现增强和持久的催化性能。

更新日期:2018-07-21
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