【摘 要】
：
A series of mesoporous Cu-Mn-Al_2O_3(CMA) materials was synthesized at moderate temperature and their structures were characterized by XRD,N_2 physical adsorpti
【机 构】
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Dalian Institute of Chemical Physics,Institute of Applied Catalysis
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A series of mesoporous Cu-Mn-Al_2O_3(CMA) materials was synthesized at moderate temperature and their structures were characterized by XRD,N_2 physical adsorption and TPR techniques.It was found that using metal complex ion[Cu(NH_3)_4~(2+)-Mn(NH_3)_6~(2+)]as raw materials is easier to form good-structure mesoporous Cu-Mn-Al_2O_3 materials than using its nitrate salt[Cu(NO_3)_2-Mn(NO_3)_2].The TPR tests results indicate that CuO and MnOx were homogeneously dispersed in the mesoporous materials.Their catalytic application to preferential catalytic oxidation of CO in a hydrogen-rich stream was studied.The activity varies in the order of CMA(1:1,molar ratio)> CMA(1:2)>CMA(2:1)>CMA(CP)>CMA(1:0)≈CMA(0:1).The CMA(1:0) and CMA(0:1) have lower activity compared to other samples,implying that there existed coordination effect between Cu-Mn in the samples.The selectivity varied in the order of CMA(0:1)>CMA(1:2)>CMA(1:1)>CMA(2:1)>CMA(1:0) at higher temperature (≥120℃),indicating that increasing the Cu content enhanced the conversion of H_2.The sample CMA(CP) made by coprecipitation method has a lower CO oxidation activity and selectivity than its counter-parts of mesoporous Cu-Mn-Al_2O_3 materials[CMA(1:2)],this attributed to the lower surface area of the former and poor interaction of CuO with MnO_x.
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