Effect of hydration on the surface basicity and catalytic activity of Mg-rare earth mixed oxides for aldol condensation |
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| Authors: | Zheng Wang Pascal Fongarland Guanzhong Lu Wangcheng Zhan Nadine Essayem |
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| Affiliation: | 1. Key Laboratory for Advanced Materials and REsearch Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Institut de REcherches sur la Catalyse et l''Environnement de Lyon (IRCELYON), CNRS – Université Lyon 1, 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France |
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| Abstract: | Magnesium and rare earth mixed oxides (Mg3REOx (RE = La, Y, Ce)) were prepared and characterized by X-ray diffraction (XRD), N2 adsorption–desorption, infrared spectra and microcalorimetry of CO2. The results reveal that the Mg3CeOx catalyst is present in the form of Mg-Ce-O solid solution, while the Mg3LaOx and Mg3YOx catalysts are probably rare earth oxides dispersed on MgO surface. As a result, among the calcined Mg3REOx catalysts, the Mg3CeOx catalyst presents the highest rate constant for acetone aldolization, which is well correlated to its more homogeneous distribution of basic sites. In contrary, the Mg3YOx catalyst exhibit the lowest catalytic activity for acetone aldolization. Upon hydration pre-treatment, the basic properties on the surface of the Mg3REOx catalysts were changed markedly. The Mg3YOx catalyst after hydration treatment shows the highest amount of basic sites on catalyst surface, and then exhibits the highest activity among the hydrated Mg3REOx catalysts. These results make it possible to fine-tune basic sites for acetone aldolization. |
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| Keywords: | Mg-rare earth mixed oxide Hydration treatment Water tolerance Aldol condensation Solid base catalyst Rare earths |
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