Effect of preparation method on MnOx-CeO2 catalysts for NO oxidation
来源期刊：Journal of Rare Earths2013年第6期
论文作者：崔明山 李渊 王欣全 王军 沈美庆
文章页码：572 - 576
摘 要：The NO oxidation reaction was studied over MnOx-CeO2 catalysts prepared by co-precipitation,impregnation and mechanical mixing method,respectively.It was found that the co-precipitation was the most active and a 60% NO conversion was achieved at 250 ℃.X-ray diffraction （XRD）,Brumauer-Emmett （BET）,H2-temperature programmed reduction （H2-TPR） and oxygen storage capacity （OSC） techniques were employed to characterize the physical and chemical properties of the catalysts.XRD results showed that amorphous MnOx or Mn-O-Ce solid solution existed in co-precipitation and impregnation prepared sample,while crystalline MnOx was found in mechanical mixing catalyst.A larger surface area was observed on co-precipitation prepared catalyst compared to those prepared by impregnation and mechanical mixing.The strong interaction between MnOx and CeO2 enhanced the reducibility of the oxides and increased the amount of Mn4+ and activated oxygen,which are favorable for NO oxidation to NO2.
崔明山1，李渊1，王欣全1，王军1，沈美庆1,2
1. Key Laboratory for Green Chemical Technology of State Education Ministry,School of Chemical Engineering & Technology,Tianjin University2. State Key Laboratory of Engines,Tianjin University
摘 要：The NO oxidation reaction was studied over MnOx-CeO2 catalysts prepared by co-precipitation,impregnation and mechanical mixing method,respectively.It was found that the co-precipitation was the most active and a 60% NO conversion was achieved at 250 ℃.X-ray diffraction （XRD）,Brumauer-Emmett （BET）,H2-temperature programmed reduction （H2-TPR） and oxygen storage capacity （OSC） techniques were employed to characterize the physical and chemical properties of the catalysts.XRD results showed that amorphous MnOx or Mn-O-Ce solid solution existed in co-precipitation and impregnation prepared sample,while crystalline MnOx was found in mechanical mixing catalyst.A larger surface area was observed on co-precipitation prepared catalyst compared to those prepared by impregnation and mechanical mixing.The strong interaction between MnOx and CeO2 enhanced the reducibility of the oxides and increased the amount of Mn4+ and activated oxygen,which are favorable for NO oxidation to NO2.
关键词：
