Molecular Sieves: Aluminophosphates

Nevenka Rajic

Nevenka Rajic

National Institute of Chemistry, Ljubljana, Slovenia

Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Search for more papers by this author
Venceslav Kaucic

Venceslav Kaucic

National Institute of Chemistry, Ljubljana, Slovenia

Search for more papers by this author
Natasa Zabukovec Logar

Natasa Zabukovec Logar

National Institute of Chemistry, Ljubljana, Slovenia

Search for more papers by this author
First published: 13 May 2011
Citations: 1

Abstract

Aluminophosphate molecular sieves exhibit structural and compositional diversity. Their frameworks can be modified by other elements, thus providing novel silicoaluminophosphate (SAPO), metaloaluminophosphate (MAPO), and metalosilicoaluminophosphate (MAPSO) materials. They possess the characteristics of both zeolites and aluminophosphates, all of which result in unique catalytic, ion-exchange, and adsorbent properties. Aluminophosphate molecular sieves have been prepared hydrothermally in nonaqueous reaction media. The crystallization process depends on a number of variables including temperature, time, molar ratio of the reactants, and pH. The most commonly investigated metal ions incorporated into aluminophosphate frameworks are transition metal ions of first transition series. Different characterization techniques are used for studying their oxidation number, location, and coordination environment within aluminophosphate frameworks. These parameters, together with structural characteristics of the framework such as pore size, pore shape, and geometry, significantly affect the catalytic performance of aluminophosphate materials. Methanol-to-olefin conversion and oxidation reactions are instances of industrially important reaction systems where aluminophosphate molecular sieves demonstrate an important catalytic performance.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.