水热溶剂对 Cu/CeO2-TiO2催化 CO2加氢制甲醇反应性能的影响

作者：Yuan Huan; Liu Huan; Yang Shengfeng; Chen Ziyang; Ye Daiqi; Chen Limin^*

来源：Acta Scientiae Circumstantiae, 2022, 42(12): 353-365.

DOI：10.13671/j.hjkxxb.2022.0167

• charge transfer
• CO2 hydrogenation
• Cu/CeO2-TiO2
• defect
• methanol
• particle size

Cu/CeO2-TiO2 catalysts for CO2 hydrogenation to methanol were synthesized by means of hydrothermal loading CeO2 onto anatase TiO2 with highly exposed（001）facets using three different solvents（methanol，ethylene glycol and glycerol），following by loading Cu through NaBH4 reduction method. XRD，SEM，BET，ICP-OES，XPS，H2-TPR，EPR and CO2-TPD characterizations indicate that CT-M using methanol/water as solvent is in favor of Cu loading and dispersion as a result of the smallest CeO2 particle diameter and the highest Ce3+ concentration，leading to the closely contact three-phase interface. After loading Cu，the interactions between Cu-CeOx-TiO2 three-phase interface over CCT-M catalyst are stronger during calcination and reduction process，producing more defects such as surface Ce3+ ，oxygen vacancies and bulk Ti3+ ，which are beneficial for the adsorption and activation of CO2. In addition，Cu species with smaller particle size accelerate the hydrogen dissociation. Therefore，CCT-M catalyst has more active sites for CO2 hydrogenation，exhibiting optimal CO2 hydrogenation to methanol activity. ? 2022 Science Press.

• 单位
  华南理工大学