碳酸二甲酯的钯炭催化剂表面金属迁移的研究

The study on the Metal Migration of Pd Catalyst of Synthesis of Dimethyl Carbonate

通过比表面积和孔体积、SEM、XPS表征手段,对新鲜Pd Cl2-Cu Cl2/AC催化剂和反应后失活催化剂进行了比较。试验结果表明,催化剂表面金属铜向内部迁移,而钯基本不变,致使催化剂比表面积和孔体积都减小。从而发现了催化剂失活的另一原因。

It studied in comparing with the fresh and deactived catalys of Pd Cl2-Cu Cl2/AC according to specific surface area, aperture volumes, XEM and XPS. Another result of catalyst deactivation was discovered. It was revealed that Cu coule be transferred from the surface of catalyst to the inner but Pd could be not which caused to the diminishing of specific surface area and aperture volumes.