| 尿素燃烧法制备CuO-ZnO/HZSM-5及其催化CO_2加氢合成二甲醚的性能 |
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| 引用本文： | 李春艳,张雅静,王康军,杜杰,王琦,吴静.尿素燃烧法制备CuO-ZnO/HZSM-5及其催化CO_2加氢合成二甲醚的性能[J].分子催化,2017,31(4):365-371. |
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| 作者姓名： | 李春艳 张雅静 王康军 杜杰 王琦 吴静 |
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| 作者单位： | 沈阳化工大学化学工程学院,辽宁沈阳,110142 |
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| 基金项目： | 国家自然科学基金项目（No.51301114，21203125），辽宁省高等学校优秀人才支持计划项目LNET（LJQ2013044），辽宁省自然科学基金（201602598，2015020649） |
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| 摘 要： | 以尿素为燃烧剂,先采用燃烧法制备CuO-ZnO催化剂,接着采用研磨法将其与HZSM-5分子筛均匀混合形成CuO-ZnO/HZSM-5双功能催化剂.采用固定床反应器,在反应温度260℃、压力3.0 MPa、空速1 500 h-1条件下,考察了不同Cu/Zn(摩尔比)催化剂在CO_2加氢合成二甲醚反应中的催化性能.通过XRD、N_2等温吸附脱附、H2-TPR、NH3-TPD对催化剂进行表征,研究了不同Cu/Zn对催化剂结构及表面酸性的影响.结果表明:当Cu∶Z n=6∶4时,催化剂对CO_2催化加氢直接合成二甲醚反应的催化活性和选择性最佳,CO_2的转化率、DME的选择性分别为11.95%和28.74%,且在催化剂上具有更多的低温还原Cu和较强的酸中心,从而提高了CO_2加氢活性和二甲醚的选择性.
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| 关 键 词： | 燃烧法 二甲醚 二氧化碳加氢 |
| 收稿时间： | 2017/5/23 0:00:00 |
| 修稿时间： | 2017/6/26 0:00:00 |
Preparation of CuO-ZnO/HZSM-5 by Urea Combustion Method and Catalytic Property for Synthesis of Dimethyl Ether from CO2 Hydrogenation |
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| LI Chun-yan,ZHANG Ya-jing,WANG Kang-jun,DU Jie,WANG Qi and WU Jing.Preparation of CuO-ZnO/HZSM-5 by Urea Combustion Method and Catalytic Property for Synthesis of Dimethyl Ether from CO2 Hydrogenation[J].Journal of Molecular Catalysis (China),2017,31(4):365-371. |
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| Authors: | LI Chun-yan ZHANG Ya-jing WANG Kang-jun DU Jie WANG Qi and WU Jing |
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| Institution: | College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China,College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China,College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China,College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China,College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China and College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China |
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| Abstract: | The CuO-ZnO catalyst were synthesized using urea as fuel by combustion method,then mixed with HZSM-5 zeolite by grinding method and form a bifunctional catalyst.The catalytic performance of catalyst with different Cu/Zn (molar ratio) for the synthesis of dimethyl ether from CO2 hydrogenation were tested,at reaction temperature 260 ℃,pressure of 3.0 MPa,space velocity 1 500 h-1 over a fixed-bed reactor.XRD,N2 isothermal adsorption-desorption,H2-TPR and NH3-TPD were employed to characterize the structure and surface properties of the catalysts with different Cu/Zn.The result indicated that the maximum catalytic activity and selectivity was obtained from the catalyst prepared when Cu ∶ Zn was 6 ∶ 4.The conversion of CO2 was 11.95％,the selectivity and the yield of dimethyl ether were 28.74％ and 3.34％ respectively.The catalyst with appropriate Cu/Zn showed better catalytic performance due to smaller grain size,better disperse of CuO species and suitable surface acidity. |
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| Keywords: | combustion dimethyl ether CO2 hydrogenation |
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