Characterization of Pd and In species in PdInH-mordenite for the SCR of NOx with methane

HERNÁN DECOLATTI; FERENC LÓNYI; HANNA SOLT; EDUARDO MIRÓ; LAURA GUTIERREZ

Valencia

Conferencia; 5th International FEZA 2011 conference; 2011

The abatement of the NOx emissions of small power plants or engines that use natural gas is a problem difficult to solve when working under lean conditions. In this sense, the proposed reduction of NOx on zeolitic catalysts or oxides with methane has produced promising results [1]. Different metals exchanged in ZSM5 and ferrierite have been reported as active catalysts for this reaction[2]. It is usually accepted that the oxidation of NO to NO2 is an important step in the reaction under study [3]. Moreover, on In-zeolite catalysts, InO+ species are associated with a high NOx adsorption capacity which in turn favors the reaction rate [4]. In this work we used several techniques to characterize the generated species when indium and palladium were exchanged in H-mordenite and the effect of the Pd/In ratio on the said species was investigated. We studied the activity of In-Hmordenite catalysts obtained by reductive solid-state ion exchange and the effect of the addition of Pd.