Effect of glow discharge plasma on copper-cobalt-aluminum catalysts for higher alcohol synthesis
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摘要: 采用共浸渍法制备了CuCo/γ-Al2O3催化剂，应用射频等离子体技术对催化剂进行改性处理。以CO加氢合成低碳醇为模型反应对催化剂进行活性评价，通过X射线物相分析(XRD)、氢氧滴定(HOT)、CO程序升温脱附(CO-TPD)和程序升温还原(TPR)等技术对催化剂进行表征，研究了射频等离子体技术强化处理对催化剂结构、吸附性能和还原性能的影响。结果表明，等离子体技术改性处理提高了催化剂活性组分的分散度，细化了铜物种的晶粒尺寸，增加反应活性位并调变了活性位对吸附物种的吸附强度，改进了催化剂的还原性能，等离子体改性处理的催化剂比未处理的样品CO加氢反应活性和低碳醇的时空产率显著提高。Abstract: The catalyst CuCo/γ-Al2O3 was prepared by coimpregnation and modified by glow discharge plasma, and then characterized by XRD, HOT, CO-TPD, and TPR. The performance of the plasma modified catalyst for CO hydrogenation to higher alcohols was investigated. The results showed that the plasma modification obviously promoted the dispersion of active species and caused the enrichment of active components on the catalyst surface. Meanwhile, the plasma treatment modified the interaction between the active species; the amount of strongly adsorbed CO on the catalyst surface was then increased remarkably. The catalytic performance of CuCo/γ-Al2O3 for higher alcohols synthesis was also enhanced by the plasma modification; the conversion of CO and the space time yield of higher alcohols over the plasma modified catalyst were higher than those over the catalyst prepared by the conventional impregnation method.
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