Catalytic reduction of CO₂ with renewable H₂ to CO via the reverse water gas shift (RWGS) reaction is an attractive approach to recycle CO₂ and control net emission of CO₂ to atmosphere. However, low activity and high CH₄ selectivity at low temperatures limited the practical implementation of the reaction. Herein, Pt-Re/SiO₂ catalysts with varying amount of Re were prepared with co-impregnation and tested for the RWGS reaction. Characterization results indicated that the oxophilic ReO_x (0 ≤ x ≤ 3.5) located in close proximity to Pt particle, modified the surface of Pt by both partial coverage and electronic interaction, resulting in the reduced number of sites for and weakened strength of CO adsorption. At 400 °C, the turnover frequency (2.30 s⁻¹) on the optimal Pt-Re/SiO₂ catalyst (Pt/Re = 1.91) is 3.9 times higher than that on Pt/SiO₂ under differential conditions, and the apparent activation energy is lowered. In contrast to Re/SiO₂ which produces significant amount of CH₄, the CO selectivity on Pt-Re/SiO₂ maintained > 96.2 % under integral conditions. Reaction order analysis revealed that Pt facilitates H₂ activation whereas the oxophilic ReO_x enhances CO₂ adsorption and activation. The perimeter sites at the Pt/ReO_x interface with a balanced hydrogenation and C-O cleavage properties synergistically improve the RWGS activity while inhibiting CH₄ production.

通过反向水煤气变换（RWGS）反应用可再生的H ₂催化还原CO _{2为CO 是回收CO 2}和控制CO ₂向大气的净排放的有吸引力的方法。然而，低温下的低活性和高 CH ₄选择性限制了该反应的实际实施。在此，通过共浸渍制备了具有不同 Re 量的Pt-Re/SiO _{2催化剂，并测试了 RWGS 反应。}表征结果表明，亲氧 ReO _x(0≤x≤3.5)位于Pt颗粒附近，通过部分覆盖和电子相互作用对Pt表面进行修饰，导致CO吸附位点数量减少，强度减弱。在400 ℃下，最佳Pt-Re/SiO _{2催化剂（Pt/Re = 1.91）的转换频率（2.30 s} ^{-1 ）是Pt/SiO} ₂在不同条件下的3.9倍，表观活化能量降低。与产生大量 CH _{4的 Re/SiO 2相比，Pt-Re/SiO 2}上的 CO 选择性在积分条件下保持 > 96.2 %。反应顺序分析表明 Pt 促进 H ₂而亲氧的ReO _x增强了CO ₂的吸附和活化。_{Pt/ReO x}界面的周边位点具有平衡的氢化和 CO 裂解特性，可协同提高 RWGS 活性，同时抑制 CH ₄的产生。