Investigations of nitric oxide and carbon monoxide adsorption on the new generation cerium exchanged silico-aluminophosphate of type 18 catalyst

Abstract

Cerium exchanged SAPO-18 material showed adsorptivity for NO and CO molecules. In situ adsorption of nitric oxide and carbon monoxide on cerium exchanged SAPO-18 materials was studied by FT-IR spectroscopy. The cerium exchanged SAPO-18 samples were prepared using the highly crystalline and pure H-SAPO-18 material. The SAPO-18 and cerium exchanged SAPO-18 materials were characterised by routine and sophisticated instrumental techniques. The presence of both Ce III and Ce IV species on the surface of the Ce-SAPO-18 catalyst were revealed by the XPS technique. The concentration of cerium is higher on the surface of the material than in the bulk. The interaction of NO with Ce-SAPO-18 material led to the formation of nitrous oxide, mono- and di-nitrosyl complexes of cerium, nitrogen dioxide and nitrate species. The formation of mono-, di- and tri- carbonyl complexes of cerium and carbon dioxide species were observed after the carbon monoxide adsorption on the Ce-SAPO-18.