Wang Xingyi~*, Li Chunxiang, Yang JuqunLaboratory for Advanceel Meterials; Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China)
Aldol condensation of HCHO and CH_3CHO over MgO, modified MgO and Al_2O_3 with rare earth oxides, was studied. The measurement of adsorption of pyrrole on catalysts by in-situ FT-IR and NH_3 TPD indicated that the addition of elements La or Ce into MgO increased the acidity of the solid. In-situ FT-IR showed that the activation of-C=O in HCHO adsorbed on CeO-MgO and La_2O_3-MgO occurred. The measurement of catalytic activity implied that the modified catalysts can promote the formation of pentaerythritol, dipentaerthritol and tripentaerythritol.
aldol condensation; formaldehyde; acetaldehyde; MgO; Al_2O_3; cerium; lanthanum; rare earths
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