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sdxujilei

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[交流] ZSM5在水相中的使用。

初次接触分子筛，了解的不多，zsm5型分子筛可以在水相中使用吗？在200度以下会不会破坏其晶体结构呢？希望做过这方面的大侠们给予解答！

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1楼 2012-06-05 15:04:48

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

linqi723

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★ ★
sdxujilei(金币+1): 谢谢参与
sdxujilei: 金币+1, 多谢您的帮助！ 2012-06-07 08:08:31

是不会的。你可以参考几个文献。
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Ravenelle, R. M., F. Schussler, et al. (2010). "Stability of Zeolites in Hot Liquid Water." Journal of Physical Chemistry C 114(46): 19582-19595.
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Zeolites Y and ZSM-5 with varying Si/Al ratios are treated in liquid water at 150 and 200 degrees C under autogenic pressure to assess their hydrothermal stability. The changes in the structure are characterized by atomic absorption spectroscopy, X-ray diffraction, scanning electron microscopy, argon physisorption, (27)Al and (29)Si MAS NMR spectroscopy, temperature-programmed desorption of ammonia, and pyridine adsorption followed by IR spectroscopy. During treatment in hot water, zeolite Y with a Si/Al ratio of 14 or higher is transformed into an amorphous material, and the rate of this degradation increases with increasing Si/Al ratio. In contrast, ZSM-5 is not modified under the same conditions. The main degradation mechanism is suggested to be hydrolysis of the siloxane bonds (Si-O-Si) as opposed to dealumination, which dominates under steaming conditions. In the resulting amorphous phase, Al remains tetrahedrally coordinated, but the micropore volume and concentration of accessible acid sites is reduced dramatically. The results demonstrate that potential structural changes of zeolites have to be considered when these materials are used as catalysts for aqueous phase conversion of biomass.
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Zhao, C. and J. A. Lercher (2012). "Upgrading Pyrolysis Oil over Ni/HZSM-5 by Cascade Reactions." Angew Chem Int Ed Engl: n/a-n/a.

Bio-oil to hydrocarbon oil: An active, selective, and stable catalyst (Ni supported in zeolite HZSM-5) allows the conversion of a wide variety of CO and CO bonds in n-hexane-extracted pyrolysis oil into hydrocarbons through a cascade of hydrogenation, hydrolysis, dehydration, and dehydroaromatization reactions. Quantitative yields of C(5) -C(9) gasoline-range hydrocarbons are obtained under mild conditions in water.
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