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Aldol condensation of HCHO and CH3CHO over MgO, modified MgO and Al2O3 with rare earth oxides,was studied. The measurement of adsorption of pyrrole on catalysts by in-situ FT-IR and NH3 TPD indicated thatthe addition of elements La or Ce into MgO increased the acidity of the solid. In-situ FI‘-IR showed that the activation of - C = O in HCHO adsorbed on CeO-MgO and La2O3-MgO occurred. The measurement of catalytic activity implied that the modified catalysts can promote the formation of pentaerythritol, dipentaerthritol and tripentaerythritol. 相似文献
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1,3-丙二醇的合成工艺进展 总被引:8,自引:0,他引:8
介绍并比较了 1,3-丙二醇的几种合成方法 ,讨论了丙烯醛法、环氧乙烷法、生物技术法和醇醛缩合法的合成路线及其工艺条件与催化剂的选择等 相似文献
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对SiO2及其用碱土金属、稀土金属修饰的混合氧化物催化剂进行了表征,并研究了其对甲醛、乙醛缩合生成丙烯醛的催化性能,详细考察了甲醛、乙醛的摩尔比;反应温度;投料速度对乙醛的转化率和生成丙烯醛的选择性等的影响。 相似文献
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