Hydrotalcites-Derived Well-Dispersed Mixed Oxides for NO x Adsorption and Desorption
A series of mixed oxides with highly dispersed redox components were prepared via hydrotalcite-like precursors with Mg2+ partially substituted by copper and cobalt. The obtained samples were characterized by XRD, TG, FTIR, N2 adsorption–desorption, H2-TPR and CO2-TPD techniques. The catalytic activities of the oxide catalysts were systematically evaluated through NO x absorption and desorption. Calcination of the hydrotalcites precursors at 500 °C resulted in the formation of mesoporous periclase MgO oxides with high surface areas of above 200 m2/g and average pore size in the range 13–16 nm. The incorporation of a small amount of Cu/Co into the precursors led to high dispersion of the transition metals, resulting in the improved reducibility and basic strength of the derived oxides. The NO x storage capacity was highly dependent on the catalyst composition and storage temperature. In general, larger amounts of NO x was stored at lower temperature (100 °C) than that at high temperature (300 °C), and cobalt catalyst stored more NO x than the other catalysts. The NO x adsorptiondesorption mechanism were investigated in details by in situ DRIFTS spectra and the function of Cu and Co in the mixed oxides were proposed.
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Document Type: Research Article
Publication date: August 1, 2016
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