摘要
FTO(Fischer-Tropsch to olefins)作为合成气制备低碳烯烃(C_(2)^(=)~C_(4)^(=))的代替路径在工业上具有重要意义。CoMnNa作为FTO反应催化剂而备受关注,但由于反应过程中CO_(2)C活性相的形成,导致CO_(2)选择性较高。引入AlO(OH)载体,制备了Co_(1)Mn_(1)Na/AlO(OH)催化剂,通过XRD、STEM、EDX-mapping、N_(2)吸附-脱附等温线、孔径分布曲线对催化剂进行了表征,通过H_(2)-TPR对催化剂的还原性进行了分析,并对催化剂的FTO反应性能进行了评价。结果表明,利用载体与CoMn的相互作用,降低了CoMn氧化物的还原性,有效抑制了CoMn中Co的析出及CO_(2)C的形成,减少了CoMn体系中Co和CO_(2)C活性相;在低碳烯烃选择性高达32.4%的情况下,成功将CO_(2)选择性降至10%以下。
As a substitute route for preparation of low carbon olefins(C_(2)^(=)~C_(4)^(=))from syngas,FTO(Fischer-Tropsch to olefins)process is of great significance in industry.CoMnNa has attracted much attention as a catalyst for FTO reaction,however,the formation of CO_(2)C active phase during the reaction process may lead to higher CO_(2)selectivity.In this paper,we prepared Co 1 Mn 1 Na/AlO(OH)catalyst by introducing AlO(OH)carrier,and characterized the catalyst by XRD,STEM,EDX-mapping,N_(2)adsorption-desorption isotherm,and pore size distribution curve.Moreover,we analyzed the reducibility of the catalyst by H_(2)-TPR,and evaluated the FTO reaction performance of the catalyst.The results show that,through utilizing the interaction between carrier and CoMn,the reducibility of CoMn oxide reduces,the precipitation of Co in CoMn and the formation of CO_(2)C can be effectively suppressed,and the active phases of Co and CO_(2)C in the CoMn system reduce.The CO_(2)selectivity reduces to less than 10%with the selectivity of low carbon olefins up to 32.4%.
作者
陈海波
张煜华
王立
李金林
CHEN Haibo;ZHANG Yuhua;WANG Li;LI Jinlin(Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,Hubei Key Laboratory of Catalysis and Materials Science,South-Central Minzu University,Wuhan 430074,China)
出处
《化学与生物工程》
CAS
北大核心
2024年第4期25-30,39,共7页
Chemistry & Bioengineering
基金
国家自然科学基金面上项目(22372199)。
