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 in | Journal of rare earths Vol. 31; no. 6; pp. 572 - 576 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.06.2013
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-0721 2509-4963 |
| DOI | 10.1016/S1002-0721(12)60322-6 |
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| Abstract | 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. |
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| AbstractList | 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 degree C. 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. 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 °C. 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. NO conversion curves of MnOx (0.4)-CeO2 prepared by different methods (gas composition: 100 ppm NO, 10% O2, 5% CO2, 5% H2O and balanced N2; GHSV=30000 h−1) 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. |
| Author | 崔明山 李渊 王欣全 王军 沈美庆 |
| AuthorAffiliation | Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering ＆ Technology, Tianjin University, Tianjin 300072, China State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China |
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| Keywords | co-precipitation NO oxidation MnOx-CeO2 rare earths |
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| Notes | 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 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
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| SubjectTerms | 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 |
| Title | Effect of preparation method on MnOx-CeO2 catalysts for NO oxidation |
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