Abstract
The thermal decomposition of Cu-Zn-Al hydroxycarbonate precursors to obtain water-gas shift catalysts was studied by employing a variety of experimental techniques. A set of six samples containing 34 wt% of Cu and different Al/Zn ratios were prepared by coprecipitation. Depending on the cation ratio, the ternary precursors contained hydrotalcite, aurichalcite and/or rosasite phases. Malachite and hydrozincite were determined in binary Cu/Al and Cu/Zn samples, respectively. The precipitates decomposed in three endothermic transformations in the temperature ranges 363–453 K, 453–673 K and 673–923 K. In the first step (ΔW=0–9%), the hydrotalcite-containing samples lost the crystallization water of the hydrotalcite phase. In the middle-temperature transition (ΔW=18–30%), the samples were completely dehydroxylated and simultaneously eliminated a proportion of the carbonate ions through a two-step dehydroxylation/decarbonation process. The high-temperature transformation (ΔW=3–7%) corresponded to the final decarbonation of the samples. Mixed oxides with a high dispersion of copper were obtained from hydrotalcite-containing precursors: the higher the amount of hydrotalcite in the precursor, the lower the CuO crystallite size in the resulting mixed oxide.
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Support of this work by the Consejo Nacional de Investigaciones Cientificas y Técnicas (CONICET, Argentina) is gratefully acknowledged.
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Ginés, M.J.L., Apesteguía, C.R. Thermal decomposition of Cu-based hydroxycarbonate catalytic precursors for the low-temperature co-shift reaction. Journal of Thermal Analysis 50, 745–756 (1997). https://doi.org/10.1007/BF01979204
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DOI: https://doi.org/10.1007/BF01979204