Abstract:

The urgency of addressing the greenhouse effect produced by CO₂ emissions is growing due to the economy’s rapid development. Reducing CO₂ emissions and slowing down global warming can be accomplished by reacting CO₂ with green hydrogen to produce value-added chemical compounds like methanol. Recently, CeO₂-supported metal catalysts for CO₂ hydrogenation to methanol have received extensive attentions. In this review, the importance of CeO₂ surface oxygen vacancy, basic sites, Ce³⁺/Ce⁴⁺ reversible redox ability, and unique geometric morphology were highlighted in the processes of CO₂/H₂ adsorption and activation and methanol formation. Moreover, the catalytic activities between CeO₂ and ZrO₂, ZnO and composite metal oxides supports were compared. Finally, the shortcomings and challenges in identifying active key intermediates, compromising between CO₂ conversion and methanol selectivity, and improving the catalytic activity and stability of CeO₂-based catalysts were highlighted. This work could provide useful advises for further design of CO₂ hydrogenation to methanol catalysts.

Key words: carbon dioxide, hydrogenation, catalyst, CeO₂ support, methanol, activation

摘要：

随着经济的快速发展，CO₂排放导致的温室效应日益严峻，通过与绿氢反应将其转化为甲醇等有价值的化工产品是减少CO₂排放、缓解全球气候变暖的有效途径。近年来，CeO₂负载金属催化剂在CO₂加氢制甲醇反应中得到了广泛关注。本文主要综述了CeO₂表面氧空位和碱性位点、Ce³⁺/Ce⁴⁺可逆氧化还原能力、几何形貌等特性在CO₂/H₂吸附活化和甲醇形成过程中所起到的重要作用，比较了CeO₂与ZrO₂、ZnO以及复合金属氧化物等载体在反应中的差异，提出了CeO₂载体催化剂在确认活性关键中间体、兼顾CO₂转化率和甲醇选择性、提高催化活性与稳定性等方面的不足和挑战，以期为新型CO₂加氢制甲醇催化剂的设计提供有益参考。

关键词: 二氧化碳, 加氢, 催化剂, CeO₂载体, 甲醇, 活性