铬助剂对Cu/ZrO2/CNTs-NH2催化剂催化CO2加氢合成甲醇性能的影响
采用并流共沉淀方法制备了一系列不同铬含量的Cu/ZrOJCNTs.NH:催化剂,在固定床反应器上考察铬对催化剂催化CO2加氢合成甲醇反应性能的影响.当铬含量为1%(w),反应温度为260℃,压力为3.0MPa,原料气组成为V(H2):V(CO2):V(N2)=69:23:8,空速为3600mL·h^-1·g^-1时,催化剂的促进效果最显著,甲醇收率达7.78%.氮吸附、粉末X射线衍射(XRD)、氢气程序升温脱附(H2-TPR)、X射线光电子能谱(XPS)、二氧化碳程序升温脱附(CO2-TPD)、差热分析(DTA)以及扫描电子显微镜(SEM)等表征结果表明,随着铬含量的增加,铜颗粒的粒径减小,催...
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| Published in | 物理化学学报 Vol. 30; no. 5; pp. 923 - 931 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
广东省大气环境与污染控制重点实验室,广州,510006%广东省大气环境与污染控制重点实验室,广州 510006
2014
华南理工大学环境与能源学院,广州 510006 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-6818 |
| DOI | 10.3866/PKU.WHXB201403051 |
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| Summary: | 采用并流共沉淀方法制备了一系列不同铬含量的Cu/ZrOJCNTs.NH:催化剂,在固定床反应器上考察铬对催化剂催化CO2加氢合成甲醇反应性能的影响.当铬含量为1%(w),反应温度为260℃,压力为3.0MPa,原料气组成为V(H2):V(CO2):V(N2)=69:23:8,空速为3600mL·h^-1·g^-1时,催化剂的促进效果最显著,甲醇收率达7.78%.氮吸附、粉末X射线衍射(XRD)、氢气程序升温脱附(H2-TPR)、X射线光电子能谱(XPS)、二氧化碳程序升温脱附(CO2-TPD)、差热分析(DTA)以及扫描电子显微镜(SEM)等表征结果表明,随着铬含量的增加,铜颗粒的粒径减小,催化剂的比表面积增大.铬的加入一方面提高了铜的分散性,抑制了ZrO2的相变和活性组分的烧结:另一方面提高了CO2的吸附量并促进CO2由弱吸附向强吸附转化,从而提高甲醇的收率:但是当铬含量大于1%时,催化剂表面Cu、Zr的总含量明显下降,降低了CO2的吸附量并且形成了超强CO2吸附物种。抑制了CO2及其中间产物的转化,从而降低了甲醇收率. |
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| Bibliography: | 11-1892/06 WANG Guan-Nan CHEN Li-Min GUO Yuan-Yuan FU Ming-Li WU Jun-Liang HUANG Bi-Chun YE Dai-Qi(1 Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China; 2College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China) A series of Cu/ZrOJCNTs-NH2 catalysts with various chromium dopings were prepared using a co- precipitation method for the synthesis of methanol by the hydrogenation of CO2. The impact of the addition of chromium on the catalytic performance of the CulZrOJCNTs-NH2 catalyst was investigated in a fixed-bed plug flow reactor. When the chromium loading was set to 1% of the total amount of Cu2+and Zr4+, the methanol yield increased to a maximum of 7.78% (reaction conditions: 3.0 MPa, 260 ℃, V(H2):V(CO2):V(N2)=69:23:8 and gaseous hourly space velocity (GHSV)=3600 mL. h-1. g-1). The catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), temperature-programmed desorption of H2 (H2-T |
| ISSN: | 1000-6818 |
| DOI: | 10.3866/PKU.WHXB201403051 |