摘要
Based on the deficiency of catalytic elements in methane sensors such as sintering,activity decrease and surface area reduction at high temperature, three differentnano vectors Ce-Zr-Al_2O_3, Ce-Al_2O_3, and Zr-Al_2O_3 were prepared via sol-gel technique inthe experiment.BET surface area, catalytic activity and thermal stability were tested andcompared.It is found from the experiment that the Ce-doped Al_2O_3 vector possesseshigher catalytic activity than pure Al_2O_3 vector.Zr-doped Al_2O_3 vector can enhance thethermal stability of methane sensors.Ce-Zr-Al solid solution can be obtained by the presenceof Ce and Zr doped with Al_2O_3.The reaction activity and thermal stability of catalyticsensors were improved because of the unique synergy effect from Ce-Zr-O.Among themixed cocatalysts, Ce-Zr-O was reported to be an excellent cocatalyst material.The performanceof methane sensors can be improved significantly via the modification ofCe-Zr-Al_2O_3 vector.
Based on the deficiency of catalytic elements in methane sensors such as sin- tering, activity decrease and surface area reduction at high temperature, three different nano vectors Ce-Zr-Al2O3, Ce-Al2O3, and Zr-Al2O3 were prepared via sol-gel technique in the experiment. BET surface area, catalytic activity and thermal stability were tested and compared. It is found from the experiment that the Ce-doped Al2O3 vector possesses higher catalytic activity than pure Al2O3 vector. Zr-doped Al2O3 vector can enhance the thermal stability of methane sensors. Ce-Zr-Al solid solution can be obtained by the pres- ence of Ce and Zr doped with Al2O3. The reaction activity and thermal stability of catalytic sensors were improved because of the unique synergy effect from Ce-Zr-O. Among the mixed cocatalysts, Ce-Zr-O was reported to be an excellent cocatalyst material. The performance of methane sensors can be improved significantly via the modification of Ce-Zr-Al2O3 vector.
基金
Supported by the National Natural Science Foundation of China(60910005)
