用溶胶 -凝胶法制得了粒径为 10nm～ 15nm、均匀分散的CeO2 超细粒子粉体 ,其担载Pd催化剂比工业CeO2 颗粒为载体的催化剂具有更高的甲醇低温裂解活性。通过BET、XRD、HRTEM、TPR以及CO FTIR等表征手段对催化剂和载体的结构和性能进行研究 ,结果表明 :Pd在高比表面积的超细CeO2 载体上高度分散 ,其还原度明显增大 ,但由于产生了较强的Pd CeO2 相互作用 ,阻碍了超细CeO2 中氧物种的还原 ,并且产生了较多的甲醇裂解活性位 The CeO2 ultrafine particles with a particle size of 10nm-15nm were prepared by sol-gel method. The supported Pd catalysts exhibited higher methanol pyrolysis activity than the catalysts with commercial CeO2 particles. The structure and properties of catalysts and supports were characterized by BET, XRD, HRTEM, TPR and CO FTIR. The results showed that Pd was highly dispersed on the ultrafine CeO2 support with high specific surface area, and its reduction degree increased obviously. However, Because of the strong Pd-CeO2 interaction, the reduction of oxygen species in the ultrafine CeO2 is hindered, and more methanolysis active sites