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Hydrotalcites-Derived Well-Dispersed Mixed Oxides for NO x Adsorption and Desorption

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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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Keywords: DESORPTION; HYDROTALCITE; MIXED OXIDES; NOx ADSORPTION; WELL DISPERSED

Document Type: Research Article

Publication date: August 1, 2016

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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