Abstract Ru-Co3O4 catalyst was prepared by the co-precipitation method. Its catalytic performance in liquid-phase hydrogenation of CO2 into methane was investigated, and compared with those of the conventional Ru-based catalysts (Ru/SiO2, Ru/CeO2, Ru/ZrO2, Ru/TiO2) prepared by impregnation method. The solvents including H2O, n-butanol, 1,4-butyrolactone, DMF, n-nonane, decalin, cyclohexane and isooctane have significant solvent effects on the catalytic performance. Compared with other solvents, the catalyst showed higher activity and selectivity when decalin and isooctane was applied as the solvent, respectively. At 200°C and H2/CO2=3:1(v/v, 4 MPa) and with decalin as the solvent, the conversion of CO2 and the selectivity of CH4 reached 45.6% and 97%, respectively. The isotope labeling experiments and in-situ diffuse reflectance infrared spectra showed that the hydrogen atoms of the tertiary carbon in decalin and isooctane were active for CO2 hydrogenation reaction, thus improving the catalytic activity.

中文翻译：

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溶剂对Ru-Co3O4催化剂对CO2液相加氢制甲烷活性的影响

摘要 采用共沉淀法制备了Ru-Co3O4催化剂。研究了其在CO2液相加氢制甲烷中的催化性能，并与浸渍法制备的常规Ru基催化剂（Ru/SiO2、Ru/CeO2、Ru/ZrO2、Ru/TiO2）进行了比较。H2O、正丁醇、1,4-丁内酯、DMF、正壬烷、萘烷、环己烷和异辛烷等溶剂对催化性能有显着影响。与其他溶剂相比，当萘烷和异辛烷分别作为溶剂时，催化剂表现出更高的活性和选择性。在200℃、H2/CO2=3:1(v/v, 4 MPa)下，以萘烷为溶剂，CO2的转化率和CH4的选择性分别达到45.6%和97%。