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Effect of hydration on the surface basicity and catalytic activity of Mg-rare earth mixed oxides for aldol condensation
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作者 Zheng Wang Pascal Fongarland +2 位作者 Guanzhong Lu Wangcheng Zhan Nadine Essayem 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第4期359-366,共8页
Magnesium and rare earth mixed oxides(Mg3 REOx(RE=La, Y. Ce)) were prepared and characterized by Xray diffraction(XRD), N_2 adsorption-desorption, infrared spectra and microcalorimetry of CO_2. The results revea... Magnesium and rare earth mixed oxides(Mg3 REOx(RE=La, Y. Ce)) were prepared and characterized by Xray diffraction(XRD), N_2 adsorption-desorption, infrared spectra and microcalorimetry of CO_2. The results reveal that the Mg_3 CeO_x catalyst is present in the form of Mg-Ce-O solid solution,while the Mg3 LaOx and Mg_3 YO_x catalysts are probably rare earth oxides dispersed on MgO surface. As a result, among the calcined Mg_3 REO_x catalysts, the Mg_3 CeO_x catalyst presents the highest rate constant for acetone aldolization, which is well correlated to its more homogeneous distribution of basic sites. In contrary, the Mg_3 YO_x catalyst exhibit the lowest catalytic activity for acetone aldolization. Upon hydration pre-treatment, the basic properties on the surface of the Mg_3 REO_x catalysts were changed markedly. The Mg_3 YO_x catalyst after hydration treatment shows the highest amount of basic sites on catalyst surface, and then exhibits the highest activity among the hydrated Mg_3 REO_x catalysts. These results make it possible to fine-tune basic sites for acetone aldolization. 展开更多
关键词 Mg-rare earth mixed oxide Hydration treatment Water tolerance Aldol condensation Solid base catalyst Rare earths
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