Effect of doped Ag on performance of manganese oxide octahedral molecular sieve for CO oxidation

被引:30
作者
Hu Rongrong [1 ]
Cheng Yi
Xie Lanying
Wang Dezheng
机构
[1] Tsing Hua Univ, Beijing Key Lab Green Chem React Engn & Technol, Dept Chem Engn, Beijing 100084, Peoples R China
[2] China Tobacco Hunan Ind Corp, Ctr Technol, Changsha 410001, Hunan, Peoples R China
关键词
manganese oxide; octahedral molecular sieve; silver; carbon monoxide; oxidation;
D O I
10.1016/S1872-2067(07)60040-0
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A series of Ag-doped manganese oxide octahedral molecular sieves (OMS-2) were synthesized by the reftux method in an acid medium. The structure of the catalysts was characterized by X-ray diffraction, N-2 adsorption, transmission electron microscopy, and temperature-programmed desorption (TPD). The effect of the promoter Ag was deduced. The results showed that the catalysts have the typical cryptomelane structure with a one-dimensional channel. The doping with Ag resulted in Ag/OMS-2 catalysts with a higher specific surface area and narrower pore size distribution than OMS-2. The catalysts showed excellent catalytic activity for CO oxidation and the catalytic activity was increased after Ag introduction. O-2-TPD and CO-TPD results showed that this was because the doping with Ag increased the rate of CO adsorption and the diffusion of lattice oxygen ions.
引用
收藏
页码:463 / 468
页数:6
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