(544ez) Direct Conversion of Carbon Dioxide into Value-Added Chemicals
AIChE Annual Meeting
Wednesday, October 31, 2018 - 3:30pm to 5:00pm
(1) The conversion of CO2 into methane over Co/ZrO2, it was found that Co/ZrO2 catalyst exhibited high activity and stability through adjusting the metal-support interaction and the special metal-support interface, such as Co-Zr interface. The 10Co/ZrO2 catalyst showed high activity with CO2 conversion of 92.5 % and CH4 selectivity of 99.9 % without deactivation even after 300 h time on stream (TOS). However, the 10Co/Al2O3 catalyst gave a lower CO2 conversion of 77.8 % which decreased to 38.6 % after 300 h TOS. Moreover, It was found that the citric acid treatment increases the activity greatly due to the increases in the dispersion of Co. TiO2 is also a good support for the Co-based catalysts, but the crystal phase has great influence on the activity and product distribution.
(2) The conversion of CO2 into CO over In2O3/TiO2 catalyst, it was found that the crystal phase also has great influence on the activity, In2O3/rutile TiO2 exhibited higher activity than In2O3/anatase TiO2.
(3) The conversion of CO2 into olefins over Fe-based catalysts, FeZn-NC and FeZnK-NC were prepared and exhibited high activity with 29.3 % and 34.6 % CO2 conversion, respectively. More importantly, the selectivity to value-added hydrocarbons (i.e., C2-C4= and C5+), which are of great importance to chemical industry and energy, was prominent over these two catalysts, and higher than 54 C-mol%. it was also found that Fe5C2 played a key role in the CO2 conversion, different from the role in the CO conversion. Fe3O4 and Ï-Fe5C2 containing catalysts displayed the best performance. However, metallic iron and/or Î¸-Fe3C containing catalysts exhibited relative inferior performance.