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【资源】Preparation of zeolite catalysts 已有3人参与
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最近读了几篇分子筛催化的基本、重要文献，大家分享 Zeolite catalysts are successfully applied in hydrocarbon processing and in chemical conversion processes. Properties which make zeolites versatile catalyst components are: Size and shape of the crystallites are variables in catalyst design and are determined by the synthesis conditions. The internal surface area is high and thermally very stable compared to those of the amorphous silicas and aluminas used traditionally in catalyst preparation. The pores are well defined and of molecular dimensions, the pore size is determined by the crystallographic structure. The pore openings ruling the accessibility of the internal surface may be subtly changed by ion-exchange, postimpregnation or chemical reaction with specific compounds, (pore size engineering). Charge-compensating cations can be removed by ion-exchange. T-atoms are in most structures highly accessible, their nature determines the polarity of the surface and its catalytic activity. The chemical composition of the lattice is dependent on the synthesis conditions. In many cases the Si/AI ratio may be varied within wide limits and for some structures also the nature of the T-atoms is a variable. The chemical composition of the lattice may be changed by the application of the various techniques for dealumination- and T-site substitution reactions (secondary synthesis), as a side effect a profound change in the texture of the zeolite may occur by the formation of mesopores. The catalytic activity of the surface of a zeolite can be modified by a treatment with a reactive chemical and this modification may be limited to the outersurface of the crystals by selection of a reagent, which due to its size, cannot reach the internal surface. 易盘下载: http://www.163pan.com/files/80100160h.html 文件名称: PREPARATION OF ZEOLITE CATALYSTS.pdf ============================== [ Last edited by buffaloli on 2010-6-5 at 09:48 ] |
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2楼2010-06-05 16:35:16
谢谢！ 3楼2010-06-05 17:16:38
4楼2010-06-05 17:42:15
5楼2010-06-06 09:12:46
简单回复
buct_xjq6楼
2010-06-09 09:17
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2010-06-09 14:03
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感谢分享！