CoPt Clusters in Na Mordenites as catalysts for SCR of NO

GUTIERREZ, LAURA; RIBOTA, ALEJANDRO; BOIX, ALICIA V.; PETUNCHI, JUAN

STUDIES IN SURFACE SCIENCE AND CATALYSIS

Elsevier Science B.V

Lugar: Amsterdam; Año: 1996 vol. 101 p. 631 - 640

0167-2991

A new material based on Pt and Co exchanged in Na Mordenite for the selective catalytic reduction (SCR) of nitric oxide with methane in the presence of excess oxygen is studied. The incorporation of 0.5% weight of Pt and 2% of Co to the zeolitic matrix after calcination and reduction on H2 flow for 1 h yields a solid converting 100% of NO to N2 and, simultaneously, 100% of CH4 to CO2 with a CH4/NO ratio = 3 and 2% of oxygen in the feed at 450ºC. When the oxygen concentration in the feed varies, the NO conversion goes through a maximum for 2% at 450ºC. The incorporation of Pt also promotes Co reducibility, 1% is reduced to Co0 in the monometallic sample and 13% in the bimetallic sample. XPS results reveal that in the temperature-programmed reduction profiles suggests a Pt-Co interaction. In order to get and efficient catalyst for nitric oxide abatement in necessary that the highly dispersed and Pt0 particles and the Co2+ and H+ions at exchanged positions be in intimate contact inside the mordenite channels.