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EXAFS INVESTIGATION OF DIVALENT METAL-ION SUBSTITUTED ALPOS

SANKAR, G; THOMAS, JM; CHEN, J; WRIGHT, PA; BARRETT, PA; GREAVES, GN; CATLOW, CRA; (1995) EXAFS INVESTIGATION OF DIVALENT METAL-ION SUBSTITUTED ALPOS. In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS. (pp. 37 - 40). ELSEVIER SCIENCE BV

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Abstract

Divalent metal ions, cobalt and zinc, substituted in three aluminophosphates structures (MeAPO-5, -18 and -36) have been characterised by EXAFS. The local structure of the three as-prepared materials were closely similar irrespective of the framework structure for the same concentration of Me(2+) ion. The Co-O bond distances are sensitive to the degree of oxidation of the heteroatom in the cobalt-substituted materials, increasing in the order: CoAPO-18 < CoAPO-36 < CoAPO-5 EXAFS analysis suggests that, in the reduced catalysts (CoAPO-18 and calcined ZnAPO-18), there are three short and one long bond associated with Me(2+)-O of the Bronsted acid centre.

Type:Proceedings paper
Title:EXAFS INVESTIGATION OF DIVALENT METAL-ION SUBSTITUTED ALPOS
Event:1st European Conference on Synchrotron Radiation in Materials Science
Location:CHESTER, ENGLAND
Dates:1994-07-03 - 1994-07-08
Keywords:BRIDGING HYDROXYL-GROUPS, COMPUTER-SIMULATION, MOLECULAR-SIEVES, CATALYST
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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