二氧化碳在Pd/SiO2和La-Pd/SiO2上的催化氢化反应

对CO₂在附载型Pd催化剂上的氢化反应的研究迄今报道不多^1,2],且都在加压条件下进行,对常压下助催剂如何改善Pd的催化行为未见报道。本文探讨了Pd/SiO₂催化剂,未加与掺加助催剂La(NO₃)₃后,其Pd粒大小、CO₂的吸附性能及CO₂/H₂催化活性等方面都有显著差异。

Catalytic Hydrogenation of CO2 over Pd/SiO2 and La-Pd/SiO2 Catalysts

The catalytic hydrogenalion of CO₂ over lanthana promoted and unpromoted Pd/SiO₂ was studied. The marked differences can be observed in catalytic activities of formation of methane and methanol.The turnover frequency of production of methane arid methanol are higher on lanthana promoted catalyst than that on unpro-moted one. These differences may be attributed to lanthana promotion effect by which the palladium particles may redispersed on the surface, meanwhile the function of the promoter probably create a number of basic active sites to modify the catalytic behavior of supported palladium catalysts on CO₂ hydrogenationreactions.