Citation:
LI Gui-Hua, WANG Hong-Yi, LI Ming-Xiu. Preparation and Application of Catalyst for Oxidativeesterification of Methacrolein to Methyl Methacrylate[J]. Chinese Journal of Applied Chemistry,
;2005, 22(7): 744-748.
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The two-step reaction for the preparation of methyl methacrylate (MMA) from methacrolein (MAL) via oxidative esterification was simplified to one-stage reaction.The catalysts were prepared by means of impregnation and applied to the oxidative esterification reaction of MAL.The results show that the catalytic activity of catalyst mainly containing Pd is increased by adding one,two or a combination of Pb,Bi and Fe.The yield of MMA can reach to 62.4% in the presence of catalyst Pd5Bi2PbFe carried on CaCO3;the catalyst carried on SiO2 or ZnO has a good activity;while the catalyst carried on MgCO3 or ZrO2 has no activity.When catalyst Pd5Bi2PbFe carried on CaCO3 with loading metal order:Pd,Pb,Bi,Fe was used in the reaction,the yield of MMA was 86.9%.The selectivity to methacrolein was improved observably when rare earth elements were added to catalysts Pd5Bi2PbFe.When catalyst Pd5Bi2PbFePr/CaCO3 was used to oxidative-esterification reaction of methacrolein,the yield of MMA could reach to 90.4%.
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