| 摘要 |
The present invention describes a process for evaluating porous materials of the hydrotalcite type in order to obtain supports and/or catalysts with an increased specific area and thermal stability, as well as a high basicity. The invention is also useful for preparing hydrotalcite-supported molybdenum and cobalt catalysts, and performing the characterization thereof by the following techniques: X-ray Diffraction XRD, Thermogravimetric Analysis TGA, Differential Thermal Analysis DTA, Temperature-Programmed Reduction TPR, Nitrogen Physisorption and Scanning Electron Microscopy SEM. A reaction at micro scale is performed so as to carry out a vapour-phase oxidation, wherein the total oxidation of bencilic alcohol into carbon oxides is not avoided, thereby originating a significant carbon lose; said lose is avoided by performing a liquid-phase oxidation using lower temperatures with regard to the vapour-phase oxidation. The aforementioned process is based on previously synthesised cobalt and/or molybdenum hydrotalcite catalysts, using a precipitation method or process. The use of Co and Mo hydrotalcite catalysts is intended to obtain benzaldehide and therefore compare the efficiency of different catalysts for performing the oxidation of bencilic alcohol.
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