Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (S1): 198.
• Chemistry in Materials Sciences • Previous Articles Next Articles
NIU Guo-Xing, LI Xiao-Yuan
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We acknowledge the support of this project by RGC-HK and HKUST.
Abstract:
The lasting extensive interest in zeolite molecular sieves, a class of nanoporous aluminosilicate oxidic crystals, lies in their three special properties:(a) the nanoscale porous cage that can serve as size- and/or shape-based host to recognize, select, and discriminate among the molecules, (b) the well-defined and controllable charge environment and charge strength inside pores that can facilitate or inhibit certain chemical processes, and (c) the well-organized pores/channels that can host the organization and assembly of molecules to display novel optical or electrochemical properties. Zeolitic materials possess yet another very important property, namely, their huge surface-to-volume ratio. Conventionally synthesized zeolites are quite large crystals with grain size at micrometer scale. This implies that the dominant portion of the "overall surface area" is attributable to the " interior surface" of nanopores/nanochannels instead of the "exterior surfaces" of the crystal powders. In many situations, this has limited the efficacy of zeolite materials, particularly in many catalysis-related applications. In order to improve the efficiency of catalysis of zeolite materials, it is often desirable to achieve a balanced ratio (~1) between interior-surface-area and exterior-surface-area, namely, to significantly reduce the size of zeolite crystals.
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NIU Guo-Xing, LI Xiao-Yuan. Encapsulation of Metalloporphyrins in Nanometer-sized Zeolites:Synthesis, Characterization and Catalysis[J]. Chem. J. Chinese Universities, 2000, 21(S1): 198.
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http://www.cjcu.jlu.edu.cn/EN/Y2000/V21/IS1/198