Non-zeolite base metal scr catalyst

B - Operations – Transporting – 01 – D

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B01D 53/94 (2006.01)

Patent

CA 2692008

A method of converting nitrogen oxides in a gas stream to nitrogen comprises contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a non-zeolite base metal catalyst consisting of: (a) at least one transition metal dispersed on a mixed oxide or composite oxide or a mixture thereof as support material consisting of cerium and zirconium; or (b) cerium oxide and zirconium oxide as single oxides or a composite oxide thereof or a mixture of the single oxides and the composite oxide dispersed on an inert oxide support material, whereon is dispersed at least one transition metal.

L'invention porte sur un procédé qui permet de convertir en azote les oxydes d'azote d'un flux gazeux, par la mise en contact des oxydes d'azote avec un agent réducteur azoté en présence d'un catalyseur métallique non zéolithique composé: (a) d'au moins un métal de transition dispersé sur un oxyde mixte ou un oxyde composite ou un mélange de ces derniers utilisé comme matériau de support composé de cérium et de zirconium; ou (b) d'oxyde de cérium et d'oxyde de zirconium sous la forme d'oxydes uniques ou d'un oxyde composite de ces derniers ou d'un mélange des oxydes uniques et de l'oxyde composite dispersés sur un matériau de support en oxyde inerte, sur lesquels est dispersé au moins un métal de transition.

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