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The effect of preparation method on thermal and chemical reducibility of Cu in Cu-Al oxides


The influence of the preparation methods on the physicochemical properties of Cu and Al oxides was studied. Four different preparation methods were used to synthesize the oxides (catalysts): co-precipitation by hydrotalcite precursor route (CuAl-HT-c), solid-state reaction route (CuAl-s), physical mixture of the oxides (CuAl-o) and individual oxides co-precipitation, followed by physical mixing (CuAl-p). Chemical analysis, X-ray diffraction and textural analysis results of the precursor CuAl-HT-c showed that the respective preparation method is efficient to obtain the hydrotalcite phase with high purity as well as generating a mixed oxide with the greatest surface area among all of the catalysts in this study. The efficacy of this method should be highlighted as it is very difficult to obtain high purity hydrotalcites with copper and aluminum. Furthermore, through the evolution of FWHM with temperature, this method provided a structural and texturally more stable mixed oxide. The thermal reducibility of the CuAl-HT-c catalyst was also much higher than that observed in the Cu and Al oxides prepared by other methods. Under He flow, the CuAl-HT-c catalyst showed a significant reduction starting at 440 °C, with the formation of Cu2O and metallic Cu, confirmed by XRD and XANES, both in situ. When investigating the effect of the pretreatment gas for this catalyst, H2 reduction occurs faster than with CO, and with less Cu+ formation. Thus, Cu and Al mixed oxides obtained from a precursor with hydrotalcite structure showed advantages over other methods, presenting unique textural and reducibility properties.

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Publication details

The article was received on 25 Mar 2018, accepted on 06 Jul 2018 and first published on 10 Jul 2018

Article type: Paper
DOI: 10.1039/C8DT01150H
Citation: Dalton Trans., 2018, Accepted Manuscript
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    The effect of preparation method on thermal and chemical reducibility of Cu in Cu-Al oxides

    C. D. O. P. Teixeira, S. D. S. Montani, L. A. Palacio and F. Zotin, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01150H

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