Abstract
Copper ion-exchanged and impregnated iron-pillared interlayer clays (Fe-PILCs), prepared by using copper solutions with different pH values and copper precursors, were tested in the selective catalytic reduction (SCR) of NO x by propene. Low pH values led to dehydroxylation of the iron pillars and damages in the clay structure. Samples prepared without pH control presented isolated Cu 2+ ions; those prepared by using alkaline pH solutions presented Cu 2+ ions and CuO clusters. It was observed that the presence of Cu 2+ ions accompanied by CuO clusters led to an improvement in the NO x yield to N 2, which was in agreement with the best activity for C 3H 6 combustion showed by these catalysts. The best catalytic results were obtained with samples prepared by ion exchange with copper II acetate under alkaline pH, where Cu 2+ ions and CuO clusters were simultaneously formed in an adequate proportion.
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