Journal
APPLIED CATALYSIS A-GENERAL
Volume 365, Issue 2, Pages 287-291Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2009.06.030
Keywords
Keggin heteropoly compounds; Vanadomolybdophosphoric acids; Cesium Keggin salts; Metal substituted POMs; Acidity
Categories
Funding
- Razi University Research Council
- Kermanshah Oil Refining Company
Ask authors/readers for more resources
A series of catalysts derived from Keggin-type heteropoly compounds (HPCs) were prepared and used as catalysts for the reaction of indole with benzaldehyde to afford bis(3-indolyl)phenylmethane. The results showed that the difference in catalytic activity of HPCs in this reaction depends on the number of introduced vanadium atoms in H(3+n)PMo(12-n)V(n)O(40), kind of support, cesium content in Cs(x)H(3-x)PW(12)O(40) and nature of the metal cation in [(n-C(4)H(9))(4)N]((7-n))PMo(2)W(9)(M(n+)center dot H(2)O)O(39). The product yield was strongly dependent on the acidic characteristics which, in turn, depend on chemical composition of catalysts. In the presence of H(3+n)PMo(12-n)V(n)O(40) and Cs(x)H(3-x)PW(12)O(40), the catalytic activity and acidity decreased with increasing V atom or cesium content. Among supported H(3+n)PMo(12-n)V(n)O(40). H(5)PMo(10)V(2)O(40)/gamma-Al(2)O3 is a weaker catalyst than bulk one. [(n-C(4)H(9))(4)N]((7-n))PMo(2)W(9)(M(n+)center dot H(2)O)O(39) catalysts exhibit a high electron-acceptor character and interesting structural and coordination properties. Catalytic activity of these Compounds is related to the difference in their ability to coordinate substrates. (C) 2009 Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available