Study on Chromium‐Containing Aluminophosphate CrAPO‐5 via Density Functional Theory
作者:
Hsiu‐Yao Cheng,
Jung‐Tzu Chang,
期刊:
Journal of the Chinese Chemical Society
(WILEY Available online 2008)
卷期:
Volume 55,
issue 1
页码: 29-38
ISSN:0009-4536
年代: 2008
DOI:10.1002/jccs.200800007
出版商: WILEY‐VCH Verlag
关键词: CrAPO‐5;AFI;Density functional theory;B3LYP method;TDDFT
数据来源: WILEY
摘要:
AbstractVarious structures of CrAPO‐5 clusters are studied via density functional B3LYP exchange‐correlation method. The optimized structures are compared with data from X‐ray absorption. Their total energies and atomic net charges are also analyzed. Results indicate that the substitution of the aluminum site of an AFI framework by chromium is in general not feasible. The chromium ion is more likely docked in between two neighboring 12‐membered rings of the framework of AFI. To further verify our claim, the excitation energies of the representative chromium structures of CrAPO‐5 clusters are calculated via the TDDFT method. The results for excitation energies further support that Cr3+is not incorporated into the
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