Selective catalytic reduction of NO with CO using different metal-oxides incorporated in MCM-41

Metal oxide doped mesoporous silica (MCM-41) were prepared by a co-precipitation method and utilized for the selective catalytic reduction of nitric oxide with carbon monoxide at temperatures in the range 423-723 K. The supported metal oxides investigated included oxides of ruthenium, copper, cobalt, nickel and iron. This selection offered a wide range of metal-oxygen bond strength within the catalyst. The catalysts were characterized by powder XRD, N-2 sorption analysis and temperature programmed reduction (TPR) in hydrogen. At reaction temperatures less than 550 K the activity of the catalysts was in the order of Ru-MCM-41 > Co-MCM-41 > Ni-MCM-41 approximate to Fe-MCM-41 approximate to Cu-MCM-41. At reaction temperatures above 650 K, the Ru-MCM-41 was still the most active catalyst followed by Cu-MCM-41. (C) 2014 Elsevier B.V. All rights reserved.