| 초록 |
ReducingThe reduction of atmospheric CO2 concentrations is an environmentally and technically significant matterissue in the current century. CO2 hydrogenation to other chemicals (e.g., CO, CH4, methanol) will be one of the solutions for CO2 mitigation process. For CO2 hydrogenation, mesoporous spinel oxides (ZnAl2O4, CuAl2O4, CoAl2O4 and, MgAl2O4) haveare been made synthesized and characterized by various tools. One remarkable feature of these spinel oxides is that they have different basic properties (quantity and strength) as characterized by temperature-programmed desorption of CO2. Accordingly, the affinity of catalytic surfaces to Lewis acidic CO2 is different and hence they show the different activity. Most catalysts except CoAl2O4 showed high CO selectivity and those catalytic activities exhibited substantial stability. Among them, CuAl2O4 having the largest amount of strong basic sites showeds the highest activity and CO selectivity, which results from the high affinity with Lewis acidic CO2. The reactivity of each catalyst figured out to be linearly proportional to the amount of strong basic sites, not the total amount of basic sites. |
