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

doi:10.3866/PKU.WHXB201403051

物理化学学报 >> 2014, Vol. 30 >> Issue (5): 923-931.doi: 10.3866/PKU.WHXB201403051

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

王冠男¹, 陈礼敏^1,2, 郭园园¹, 付名利¹, 吴军良¹, 黄碧纯^1,2, 叶代启^1,2

1 广东省大气环境与污染控制重点实验室, 广州510006;
2 华南理工大学环境与能源学院, 广州510006

收稿日期:2014-01-08 修回日期:2014-03-03 发布日期:2014-04-25
通讯作者: 陈礼敏，叶代启 E-mail:liminchen@scut.edu.cn;cedqye@scut.edu.cn
基金资助:
国家自然科学基金（21207039，51108187，0978103），广东省自然科学基金（S2011010000737），教育部高校博士点新教师基金（20110172120017）和2012 年教育部留学回国人员科研启动基金资助项目

Effect of Chromium Doping on the Catalytic Behavior of Cu/ZrO₂/CNTs-NH₂ for the Synthesis of Methanol from Carbon Dioxide Hydrogenation

WANG Guan-Nan¹, CHEN Li-Min^1,2, GUO Yuan-Yuan¹, FU Ming-Li¹, WU Jun-Liang¹, HUANG Bi-Chun^1,2, YE Dai-Qi^1,2

1 Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China;
2 College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China

Received:2014-01-08 Revised:2014-03-03 Published:2014-04-25
Contact: CHEN Li-Min, YE Dai-Qi E-mail:liminchen@scut.edu.cn;cedqye@scut.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21207039, 51108187, 0978103), Natural Science Foundation of Guangdong Province, China (S2011010000737), Specialized Research Fund for the Doctoral Program of Higher Education, China (20110172120017), and Scientific Research Foundation for Returned Scholars, Ministry of Education of China (2012).

摘要/Abstract

摘要：

采用并流共沉淀方法制备了一系列不同铬含量的Cu/ZrO₂/CNTs-NH₂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3600 mL·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.

关键词: 氨基碳纳米管, 铬, 铜, 氧化锆, 甲醇合成, 二氧化碳加氢

Abstract:

A series of Cu/ZrO₂/CNTs-NH₂ catalysts with various chromium dopings were prepared using a coprecipitation method for the synthesis of methanol by the hydrogenation of CO₂. The impact of the addition of chromium on the catalytic performance of the Cu/ZrO₂/CNTs-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-TPD), X-ray photoelectron spectroscopy (XPS), temperature- programmed desorption of CO₂ (CO₂-TPD), differential thermal analysis (DTA), and scanning electron microscopy (SEM). The results of these analyses indicated that the introduction of chromium reduced the size of the Cu nanoparticles, enhanced the dispersion of the Cu species, inhibited the phase transformation and sintering of ZrO₂, increased the specific surface area, enhanced the amount of CO₂ adsorbed, and promoted the conversion of weakly adsorbed CO₂ species to strongly adsorbed CO₂ species. Taken together, these factors lead to a high methanol yield. However, when the chromium loading was greater than 1%, the amount Cu and Zr on the surface, as well as the size of the Cu nanoparticle reduced considerably, which led to a significant reduction in the adsorption of CO₂ species. This effect also facilitated the formation of strongly adsorbed CO₂ species, leading to lower methanol yields.

Key words: CNTs-NH₂, Chromium, Copper, Zirconia, Methanol synthesis, Carbon dioxide hydrogenation

王冠男, 陈礼敏, 郭园园, 付名利, 吴军良, 黄碧纯, 叶代启. 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[J]. 物理化学学报, 2014, 30(5), 923-931. doi: 10.3866/PKU.WHXB201403051

WANG Guan-Nan, CHEN Li-Min, GUO Yuan-Yuan, FU Ming-Li, WU Jun-Liang, HUANG Bi-Chun, YE Dai-Qi. Effect of Chromium Doping on the Catalytic Behavior of Cu/ZrO₂/CNTs-NH₂ for the Synthesis of Methanol from Carbon Dioxide Hydrogenation[J]. Acta Phys. -Chim. Sin. 2014, 30(5), 923-931. doi: 10.3866/PKU.WHXB201403051

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201403051

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I5/923

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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

Effect of Chromium Doping on the Catalytic Behavior of Cu/ZrO₂/CNTs-NH₂ for the Synthesis of Methanol from Carbon Dioxide Hydrogenation

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