Preparation of M/Ce_(1-x)Ti_(x)O_(2)(M=Pt,Rh,Ru)from sol-gel method and their catalytic oxidation activity for diesel Soot  

作　　者：Bing Zhao Wenlin Chen Yifeng Tan Fan Li Mengkui Tian 

机构地区：[1]College of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China

出　　处：《Journal of Rare Earths》2022年第12期1849-1859,I0002,共12页稀土学报（英文版）

基　　金：Project supported by National Key Research and Development Program of China(2018YFC1801706-01);the Natural Science Foundation of China(21663009,2216020078);the Science and Technology Project of Guizhou Province(20192835,2021480)。

摘　　要：A series of Ce_(1-x)Ti_(x)O_(2)mixed oxide catalysts were synthesized by sol-gel method and then loading of noble metal(M=Pt,Rh,Ru)was used for soot oxidation.Ti-doped Ce_(1-x)Ti_(x)O_(2)catalysts(x is the molar ratio of Ti/(Ti+Ce)and ranges from 0.1 to 0.5)exhibit much better oxidation performance than CeO_(2)catalyst,and the Ce_(0.9)Ti_(0.1)O_(2)catalyst calcined at 500℃has the best catalysis activity.Each noble metal(1 wt%)was supported on Ce_(0.9)Ti_(0.1)O_(2)(M/C9 T1)and the properties of the catalysts were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Raman,Brunauer-Emmett-Teller(BET)method,and H_(2)-temperature programmed reduction(H_(2)-TPR)results.Results show that the introduction of Ti into CeO_(2)forming Ti-O-Ce structure enhances the catalytic activity and increases the number of oxygen vacancies at the catalyst surface.The noble metal is highly dispersed over Ce_(0.9)Ti_(0.1)O_(2),and M/C9 T1 catalysts present enhanced activity in comparison to Ce_(0.9)Ti_(0.1)O_(2).It is found that noble metals can greatly increase the activity of the catalyst and the corresponding oxidation rate of soot can enhance the electron transfer capacity and oxygen adsorption capacity of the catalyst.A small amount of Ti doping in CeO_(2)can significantly improve the activity of the catalyst,while a large amount of Ti reduces the performance of the catalyst because a large amount of Ti is enriched on the surface of the catalyst,which hinders the contact and reaction between the catalyst and the soot.

关 键 词：Diesel oxidation catalyst Soot oxidation Ce-Ti oxides Rare earths 

分 类 号：O643.36[理学—物理化学] X734.2[理学—化学]