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Effective NOx Decomposition and Storage/Reduction over Mixed Oxides Derived from Layered Double Hydroxides

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journal contribution
posted on 15.08.2007, 00:00 by Jun Jie Yu, Xiao Ping Wang, Yan Xin Tao, Zheng Ping Hao, Zhi Ping Xu
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 N2, 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 °C. The adsorbed NOx species (nitrates and nitrites) are also observed to be readily reduced by H2 within 6 min at 350 °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.