Co 负载量对 Co/TiZrO4催化 CO2氧化乙烷脱氢制乙烯反应性能的影响

作者：Liu Huan; Wang Ying; Chen Ming; Ye Daiqi; Chen Limin^*

来源：Acta Scientiae Circumstantiae, 2023, 43(2): 433-446.

DOI：10.13671/j.hjkxxb.2022.0184

• Co-based catalysts
• CO2
• ethylene
• metal-support interaction
• oxidative dehydrogenation of ethane

Co-based catalysts exhibit great potential in direct dehydrogenation and oxidative dehydrogenation of light alkanes to alkenes. In order to elucidate the effects of the valence state of Co on the catalytic performance of CO2 oxidative ethane dehydrogenation to ethylene，a series of X%Co/ TiZrO4（X=0.5，1，3，5 and 7.5）catalysts were prepared by impregnation using the TiZrO4 solid solution obtained by co-precipitation as support. Among them，0.5%Co/TiZrO4 and 1%Co/TiZrO4 showed low activity but considerable C2H4 selectivity（>90%）and carbon balance（≈100%）；3%Co/ TiZrO4 appeared excellent C2H6 and CO2 conversion during the whole process and obtained about 25% C2H4 yield at 650 ℃ and WHSV of 9000 mL·g-1·h-1. However，5%Co/TiZrO4 and 7.5%Co/TiZrO4 exhibited a significant decrease in ethylene selectivity and severe coke deposition when the reaction temperature was higher than 600 ℃. SEM，XRD，Raman，UV-vis，XPS，H2-TPR and in-situ Raman characterizations indicate that Co2+-TiZrO4 possesses high C2H4 selectivity due to the strong metal-support interactions. Moderate amount of Co0 contributes to the activation of CO2 and C2H6，while the aggregated bulk Co0 nanoparticles promote the dry-reforming reaction and coke deposition，resulting in catalyst deactivation. ? 2023 Science Press.

• 出版日期2023
• 单位华南理工大学