Effective NOx decomposition and storage/reduction over mixed oxides derived from layered double hydroxides

In this research note, we report two rationally designed mixed-oxide catalysts for the effective abatement of NOx. Two catalysts (Ca2Co1Al1-oxide and Ca2Co1La0.1Al0.9-oxide) that have been derived from their layered double hydroxide (LDH) precursors can catalytically decompose most (55%-75%) NO supplied in the inlet stream to N-2, completely trap the remaining NO for up to 1200 s, and continue to store NO for 2100 s in the presence of oxygen at 300 degrees C. The adsorbed NOx species (nitrates and nitrites) are also observed to be readily reduced by H-2 within 6 min at 350 degrees C. Overall, these two mixed-oxide catalysts exhibit very high activities in NO decomposition and storage/reduction, and these values are comparable with or superior to those oxide catalysts that contain noble metals.