UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Influence of organic templates on the structure and on the concentration of framework metal ions in microporous aluminophosphate catalysts

Lewis, DW; Catlow, CRA; Thomas, JM; (1996) Influence of organic templates on the structure and on the concentration of framework metal ions in microporous aluminophosphate catalysts. CHEM MATER , 8 (5) 1112 - 1118.

Full text not available from this repository.

Abstract

Energy minimization methods are used to investigate the packing energies of triethylamine and triethylammonium templates in two distinct aluminosilicate structures, AIPO(4)-5 (AFI code) and the chabazitic AIPO(4)-34 polymorph (CHA), both of which may be synthesized as Co-AIPOs from the same gel, depending on the concentration of Co2+ and template. We show that higher (cationic) concentrations of template, induced by higher (negatively charged) Co2+ substitution levels in the framework, favor the formation of a chabazitic structure. The AIPO(4)-5 polymorph is, however, marginally more stable in the untemplated state, a result which is consistent with the reversion of the chabazitic phase to the AIPO(4)-5 polymorph at higher temperatures or increased reaction time.

Type:Article
Title:Influence of organic templates on the structure and on the concentration of framework metal ions in microporous aluminophosphate catalysts
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

Archive Staff Only: edit this record