24小时热门版块排行榜

返回列表

sdxujilei

至尊木虫 (职业作家)

应助: 145 (高中生)
金币: 21522.3
帖子: 3875
在线: 478.9小时
虫号: 1029593

[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！

回复此楼

» 猜你喜欢

» 本主题相关商家推荐: (我也要在这里推广)

» 本主题相关价值贴推荐，对您同样有帮助:

普通活性炭使用前活化的方法已经有20人回复
反应釜使用介绍已经有10人回复
去美国申请工行的双币国际visa卡，请问在美国使用方便吗？已经有26人回复
固体催化剂煅烧后需要冷却后使用吗？已经有4人回复
问个菜鸟的问题，Material Studio可以不可以做水相中有机物的吸附模拟？已经有9人回复
水相中suzuki反应水溶液怎么除氧脱气？已经有17人回复
液相测定时，水相中冰醋酸和甲酸的浓度范围大概是多少？已经有11人回复
关于萃取剂的选择，有没有从水相中萃取效果比乙酸乙酯好点的~~~ 已经有52人回复
【求助】磺酰氯与水相中的氨基化合物的反应已经有7人回复
【求助】怎么出去水相中的TsOH 已经有5人回复

» 抢金币啦！回帖就可以得到:

查看全部散金贴

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

sunnyboy

禁虫 (正式写手)

★
sdxujilei(金币+1): 谢谢参与

本帖内容被屏蔽

2楼2012-06-05 16:54:43

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

linqi723

铁杆木虫 (著名写手)

应助: 75 (初中生)
金币: 8005.6
帖子: 2768
在线: 1395.3小时
虫号: 559344

★ ★
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。
**********************************
Ravenelle, R. M., F. Schussler, et al. (2010). "Stability of Zeolites in Hot Liquid Water." Journal of Physical Chemistry C 114(46): 19582-19595.
*
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.
**********************************

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.
**********************************