ISSN: 0304-128X ISSN: 2233-9558
Copyright © 2024 KICHE. All rights reserved

Articles & Issues

Conflict of Interest
In relation to this article, we declare that there is no conflict of interest.
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.

All issues

Faujasite형 제올라이트의 Dealumination 반응기구에 대한 CNDO/2 분자궤도론적 계산

CNDO/2 MO Calculations for Dealumination Mechanism of Faujasite Type Zeolite

HWAHAK KONGHAK, April 1988, 26(2), 221-228(8), NONE
downloadDownload PDF

Abstract

Faujasite내의 T자리를 표현하는 cluster 모델상의 각 원자들에 대한 전하밀도와 wiberg 결합차수 및 전체에너지를 얻기 위해서 CNDO/2 계산을 행하였다. Dealumination 반응기구의 고찰을 위해 제안된 모델들의 화학적 안정성은 전체에너지로서 설명하였다.
Cluster 모델들의 전하 밀도와 결합차수는 H+ 공격에 따라서 현저하게 변하였다. 계산된 결과들은 산성용액에서의 faujasite의 dealumination 반응이 산 공격에 의한 Al-O 결합의 약화에 기인된 것임을 보여주었다.
The CNDO/2 calculations have been applied on cluster models for the representative T sites in faujasite to get atomic charge densities, wiberg bond orders and total energies. The chemical stabilities of suggested models for the dealumination mechanism were also explained in terms of total energies. The calculated charge densities and bond orders of cluster models have been changed remarkally according to the H+ attack. The calculated results showed the dealumination of faujasite in acidic solution was caused of Al-O bond weakening by acid attack.

Keywords

The Korean Institute of Chemical Engineers. F5, 119, Anam-ro, Seongbuk-gu, 233 Spring Street Seoul 02856, South Korea.
Phone No. +82-2-458-3078FAX No. +82-507-804-0669E-mail : kiche@kiche.or.kr

Copyright (C) KICHE.all rights reserved.

- Korean Chemical Engineering Research 상단으로