Roles Investigation of Promoters in K/Cu–Zn Catalyst and Higher Alcohols Synthesis from CO2 Hydrogenation over a Novel Two-Stage Bed Catalyst Combination System
Roles Investigation of Promoters in K/Cu–Zn Catalyst and Higher Alcohols Synthesis from CO2 Hydrogenation over a Novel Two-Stage Bed Catalyst Combination System
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DOI：
10.1007/s10562-014-1446-7
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发表时间：
2015-02
影响因子：
2.8
通讯作者：
Hai-jun Guo;Shanggui Li;Fen Peng;Hai-rong Zhang;L. Xiong;Chao Huang;Can Wang;Xin-de Chen
中科院分区：
文献类型：
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作者：
Hai-jun Guo;Shanggui Li;Fen Peng;Hai-rong Zhang;L. Xiong;Chao Huang;Can Wang;Xin-de Chen
摘要：研究了一种低温RWGS催化剂与另一种高温改性F-T合成催化剂组成的新型两级床催化剂组合体系，用于co2加氢合成高级醇。首先，通过n2吸附/解吸、XRD、H2-TPR、CO2-TPD和RWGS反应试验研究了K2O和ZnO促进剂在cu基催化剂中的作用。结果表明，K2O对改善CuO-ZnO相互作用有积极作用，ZnO对促进铜种的分散和提高铜金属的单位表面积起支撑作用。在cuzn1.0 k0.15催化剂上，由于K2O和ZnO促进剂之间的协同促进作用，铜与ZnO颗粒表面接触分散良好，使得RWGS伴随甲醇合成反应具有理想的性能。然后，对催化剂组合体系的加载方式和加载体积比进行了优化。结果表明，在最佳的CZK(1.5)/ CFCK（4.5）两级床催化剂组合体系上，由于催化剂的热耦合效应和产物转化耦合效应，可以有效地由co2加氢合成高级醇。由于热耦合效应和产物转化耦合效应，在CZK(1.5)/ CFCK（4.5）两级床催化剂组合体系上有效地进行了co2加氢合成高级醇。
AbstractA novel two-stage bed catalyst combination system composed of a low-temperature RWGS catalyst and another high-temperature modified F–T synthesis catalyst was developed to higher alcohols synthesis from CO2hydrogenation in this work. Firstly, the roles of K2O and ZnO promoters in Cu-based catalyst were investigated by N2adsorption/desorption, XRD, H2-TPR, CO2-TPD and RWGS reaction test. Results showed that K2O plays a positive role in improving the CuO–ZnO interaction and ZnO acts as a support for promoting the dispersion of copper species and improving the unit surface area of copper metal. Well dispersed copper in contact with the surface of ZnO particles leads to the ideal performances for RWGS reaction accompanying with methanol synthesis over CuZn1.0K0.15catalyst due to the synergetic promotion effect between K2O and ZnO promoters. Then, the optimization of loading mode and loading volume ratio of catalyst combination system was conducted. It was indicated that the higher alcohols can be effectively synthesized from CO2hydrogenation over the optimal CZK(1.5)//CFCK(4.5) two-stage bed catalyst combination system due to the thermal coupling effect and product conversion coupling effect of these catalysts.Graphical AbstractThe higher alcohols synthesis from CO2hydrogenation was effectively conducted over the CZK(1.5)//CFCK(4.5) two-stage bed catalyst combination system due to the thermal coupling effect and product conversion coupling effect.