合成低碳醇用CuCo基催化剂的CNT改性制备与性能研究

CNT promoted preparation and catalytic properties of CuCo-based catalysts for high-alcohol synthesis

采用超声辅助的反相共沉淀法制备了合成气转化制低碳醇用CuCo基催化剂,研究了碳纳米管(CNT)作为助剂对催化剂的组织结构、表面吸附行为、合成低碳醇催化性能等的影响规律和作用机制。粉末X射线衍射物相分析结果表明,CNT的改性有利于Cu-Co尖晶石相的形成,使合成醇的活性位增多,程序升温实验分析结果显示了CNT的添加改善了催化剂的还原性能,显著提高了催化剂表面对CO的吸附活化能力和碳链增长能力,CNT改性制备的催化剂对CO加氢合成低碳醇表现出较高的催化活性和醇时空产率及C2+醇选择性。

CuCo-based catalysts for high-alcohol synthesis from syngas have been prepared by ultrasound assisted reverse coprecipitation.The influence mechanism of carbon nanotubes on the structure,adsorption property and catalytic imformance were investigated in the present work.The XRD results showed that CNT modification was favorable to the formation of Cu-Co spinel structure and increase active sites for alcohol synthesis.Temperature-programmed experiments analysis indicated that after the addition of CNT,the reducibility was improved,the capabilities of adsorption-activation of CO on the catalyst surface and carbon-chain growth were enhanced significantly.The CNT modified catalyst exhibits higher catalytic activity,alcohol yield and selectivity to C2＋OH.