Effect of preparation method on MnOx-CeO2 catalysts for NO oxidation

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 oC. X-ray diffraction （XRD）, Brumauer-Emmett （B...

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Published inJournal of rare earths Vol. 31; no. 6; pp. 572 - 576
Main Author 崔明山 李渊 王欣全 王军 沈美庆
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2013
Subjects
Catalysis
Catalysts
co-precipitation
Coprecipitation
Diffraction
Impregnation
MnOx-CeO2
Nitrogen dioxide
NO oxidation
NO2
Oxidation
Rare earth metals
rare earths
Reduction
X-ray diffraction
X-射线衍射
共沉淀法
制备方法
机械混合法
氧化锰
程序升温还原
铈催化剂
co-precipitation
NO oxidation
MnOx-CeO2
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(12)60322-6

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Summary: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 oC. 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.
Bibliography:11-2788/TF
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 oC. 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.
CUI Mingshan LI Yua, WANG Xinquan , WANG Jun , SHEN Meiqing（1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering ＆ Technology, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China）
MnOx-CeO2; NO oxidation; co-precipitation; rare earths
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60322-6