以MOFs为模板,通过水热合成、高温煅烧制备得到Co-C/FeO_<i>x复合材料,在300℃、0.2 MPa条件下探究了其对CO₂的催化还原性能。通过调控Co-C和FeO_<i>x的质量比探究CO₂还原产物的分布,结果表明,当Co-C和FeO_<i>x质量比为1∶4时,CO₂转化率为28.8%,C₂H₆和C₃H₈的选择性提高至28.6%。FeO_<i>x的引入促进了中间体CO^*的生成,Co-C和FeO_<i>x两者的结合使CO₂还原兼顾了CO₂转化率与C₂₊产物的选择性。该研究不仅为CO₂选择性还原为多碳产物提供了一种有效策略,还展示了以MOFs为前驱体合成的碳负载金属/金属氧化物复合材料在催化中的应用潜力。

Co-C/FeO_x composite is prepared via hydrothermal synthesis and high temperature calcination by using MOFs as templates.Its catalytic performance for CO₂ reduction at 300℃ and 0.2 MPa is investigated.The distribution of the products from CO₂ reduction is explored by adjusting the mass ratio of Co-C and FeO_x in the composite.It is found that the conversion rate of CO₂ reaches 28.8% and the selectivity of C₂H₆ and C₃H₈ is improved to 28.6% when the mass ratio of Co-C and FeO_x is 1∶4.The addition of FeO_x can promote the formation of CO* intermediate.The combination of Co-C and FeO_x makes the CO₂ reduction process take into account both the CO₂ conversion and the selectivity of C₂₊ products.This study provides an effective strategy for the selective reduction of CO₂ to multi-carbon products,and also discloses the application potential of carbon-supported metal/metal oxide composites synthesized with MOFs as precursors in catalysis.

蔡静宇(1991-),男,博士,讲师,硕士生导师,研究方向为催化及导热材料,jycai1991@fzu.edu.cn;肖龙强(1988-),男,博士,副教授,硕士生导师,研究方向为催化材料及电子化学品的设计合成,xiaolq@fzu.edu.cn。