Differential Thermal Analysis and Quantum Chemical Consideration for Catalytic Stability of Ion Exchanged Faujasite Type Zeolite 1. Ni2+-Faujasite계

이온교환된 Faujasite형 제올라이트의 촉매적 안정성에 대한 시차열분석 및 양자화학적 고찰; 1. Ni2+-Faujasite계

  • Kim, Myung-Chul (Department of Chemistry, Kyungpook Sanup University) ;
  • Kim, Jong-Taik (Department of Industrial Chemistry, Kyung pook National University)
  • 김명철 (경북산업대학교 교양과정부) ;
  • 김종택 (경북대학교 공업화학과)
  • Received : 1992.08.20
  • Accepted : 1992.11.09
  • Published : 1993.03.01

Abstract

The thermochemical stability of $Ni^{2+}-faujasite$ was studied by differential thermal analysis(DTA), thermal gravitational analysis(TGA), X-ray diffraction analysis(XRD) and quantum chemical calculations. Dehydration of $Ni^{2+}-faujasite$ was observed at 373-773K. A CNDO/2 calculations have been applied on cluster models for the representative T sites in faujasite to get total energy and wiberg bond orders. It has proved that the decrease of zeolitic crystallinity is directly related to the weakening of Al-O bonds in framework.

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Acknowledgement

Supported by : 한국학술진흥재단