Synthesis and Physicochemical Properties of Ultrafine Coppersilicate with MEL Structure

Abstract

Abstract: Ultrafine coppersilicate with MELstructure has been hydrothermally synthesized for the first time under static conditions. By means of XRD, TEM, FTIR, ESR, TGDTAand NH₃ TPDthe physicochemical property of this novel material was investigated. It was revealed that the as synthesized coppersilicate, which was a uniform, monophase and ultrafine nanomaterial with crystallite size less than₁×10^-8 m , was highly crystalline and thermal stable. Cupric ions were highly dispersed and mainly resided in distorted tetrahedral and square pyramidal environments in the as synthesized as well as the calcined coppersilicates. Incorporation of copper ions into the framework during crystallization also resulted in a weak acidity of this material.

Key words: Coppersilicate, Ultrafine partical, Hydrothermal crystallizaion, MEL structure, Characterization

CLC Number:

O614

TrendMD:

TANG Xiang-Hai, ZHU Rui-Zhi, PAN Lü Rang, LI He-Xuan . Synthesis and Physicochemical Properties of Ultrafine Coppersilicate with MEL Structure[J]. Chem. J. Chinese Universities, 2000, 21(4): 517.

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Synthesis and Physicochemical Properties of Ultrafine Coppersilicate with MEL Structure

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