Palladium-loaded ZnO (Pd/ZnO) catalyst was synthesized by co-precipitation method and evaluated for plasma-catalytic reverse water-gas shift (RWGS) reaction. A CO₂ conversion of 32.5% was achieved on “Pd/ZnO + Plasma”, and was around two times higher than that of “ZnO + Plasma” (17.3%). Catalyst characterization by X-ray diffraction, high-resolution transmission electron microscopy, temperature-programmed reduction and quasi in situ X-ray photoelectron spectroscopy revealed the possible formation of ZnO_x@PdZn (ZnO_x decorated PdZn alloy) at the interface of Pd active phase and ZnO support. The role of ZnO_x@PdZn in plasma-catalytic CO₂ conversion was systematically investigated by plasma-excited CO₂ temperature-programmed desorption and in situ Fourier transform infrared spectroscopy. It was found that ZnO_x@PdZn at Pd-ZnO interface improved significantly plasma-catalytic CO₂ conversion by promoting the production of bidentate carbonate and bidentate formate species. In situ Raman spectroscopy studies proved that the ZnO_x@PdZn remained largely intact during the RWGS process. Our in situ spectroscopic findings thus unveil that the ZnO_x@PdZn at Pd-ZnO interface favors the activation of CO₂, and, consequently, leads to a higher plasma-catalytic performance for CO₂ conversion.

通过共沉淀法合成了负载钯的ZnO（Pd / ZnO）催化剂，并进行了等离子体催化逆水煤气变换（RWGS）反应的评估。“ Pd / ZnO +等离子体”的CO ₂转化率为32.5％，是“ ZnO +等离子体”的17.3％的两倍左右。通过X射线衍射，高分辨率透射电子显微镜，程序升温还原和准原位X射线光电子能谱对催化剂进行表征，发现可能在Pd活性物界面上形成ZnO _x @PdZn（ZnO _x装饰的PdZn合金）。相和ZnO载体。ZnO _x @PdZn在等离子体催化CO _{2中的作用}通过等离子激发CO _2程序升温脱附和原位傅里叶变换红外光谱系统地研究了转化率。结果发现，Pd-ZnO界面处的ZnO _x @PdZn通过促进碳酸盐和碳酸盐的生成，显着提高了等离子体催化的CO ₂转化率。原位拉曼光谱研究证明，在RWGS过程中ZnO _x @PdZn基本上保持完整。因此，我们的原位光谱发现揭示了Pd-ZnO界面处的ZnO _x @PdZn有利于CO ₂的活化。，因此导致更高的CO ₂转化等离子体催化性能。