Catalysis by Lead Oxide for Diethyl Carbonate Synthesis from Ethyl Carbamate and Ethanol

Abstract

The catalysis by lead oxide in the reaction of ethyl carbamate (EC) with ethanol to form diethyl carbonate (DEC) was studied. The lead oxide catalyst exhibited an excellent stability, which could be reused five times without a significant loss in catalytic activity. X-Ray powder diffraction analysis showed that the recovered catalyst was a mixture of cubic metal Pb and orthorhombic PbO 2 , with the latter shown to be the real active component for the synthesis of DEC. Verification experiments showed that the reaction between DEC and PbO was the main reason for the reduction of PbO to metal Pb. 研究了氧化铅在氨基甲酸乙酯 (EC) 与乙醇反应合成碳酸二乙酯 (DEC) 中的催化作用. 结果表明, 氧化铅具有很好的稳定性, 重复使用 5 次, 其催化活性无明显下降. 回收的催化剂为立方晶相金属 Pb 和斜方晶相 PbO 2 的混合物, 结合反应结果可认为, 该混合物为反应的活性组分. 结果还发现, PbO 与 DEC 反应是 PbO 被还原为 Pb 的主要原因. The reaction between diethyl carbonate (DEC) and PbO is responsible for the reduction of PbO to metal Pb, and a mixture of cubic metal Pb and orthorhombic PbO 2 is the real active component for DEC synthesis.