Cu-Ni@NiPSNTs芯鞘结构催化剂制备及其催化CO2加氢性能研究
首发时间:2017-12-26
摘要:CO2 催化加氢制低碳醇高效稳定的铜基催化剂制备是该过程的难点,本文开展了高效稳定的Cu-Ni@NiPSNTs芯鞘结构催化剂制备、表征和催化剂在CO2加氢合成甲醇和乙醇反应性能研究。结果表明,水热合成过程的溶液浓度对纳米管的性质影响显著,纳米管内铜的负载量决定着催化剂的活性位形成和数量,该催化剂具有很好的乙醇选择性,归结于鞘结构对反应物和中间产物起到空间限域作用,提高反应物在管内停留时间,有利于碳链增长的反应发生,从而提升乙醇的选择性。
关键词: 二氧化碳转化 催化加氢 铜基催化剂 芯鞘结构 硅酸盐
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Cu-Ni@NiPSNTs Core-Shearth Nanocatalyst for Catalytic CO2 Hydrogenation
Abstract:The prepartion of highly efficient and stable copper based catalysts is one of the key issues for the catalytic hydrogenation of CO2 to low carbon alcohols.This paper reported the preparation, characterization and activity test of the Cu-Ni@NiPSNTs core-sheath nano-catalysts in the hydrogenation of CO2 to methanol and ethanol. The results showed that the concentration of the solution in the hydrothermal synthesissignificantlyeffectedthe properties of the nanotubes, while the loading of copper nanoparticlesin the NiPSNTs determined the formation and surface density of active sites.This catalyst exhibitedexcellect selectivity of ethanolin the CO2 hydrogenation, which, may be attributed to the spatial confinement of the sheath structures, to improve residence time of of reactants and intermediates in the tubes, facilitatecarbon chain growth reaction, and thus enhance the selectivity of ethanol.
Keywords: CO2 conversion catalytic hydrogenation copper based catalyst core-shreath structure silicates
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