Department of Aerospace Engineering, College of Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju, 61452, Republic of Korea.
J Nanosci Nanotechnol. 2021 Jul 1;21(7):3853-3857. doi: 10.1166/jnn.2021.19186.
The effect of -Al₂O₃ and Ce/Al₂O₃ nano-catalysts under plasma on CO₂ conversion was investigated via DRIFTS. The adsorption of CO₂ on the nanoparticle of -Al₂O₃ surface caused to produce the carbonate species, of which the amount was dependent on temperature. In addition, we confirmed that the formation of carbonate could be more activated by plasma. The Ce nano-catalyst played a role to inhibit the production of carbonate on the surface of Al₂O₃ under the plasma. Indeed, when the Ce/Al₂O₃ catalyst was exposed to plasma-excited CO₂, the carbonate was almost eliminated at over 300 °C, resulting in the improved CO₂ conversion. Notably, the Ce-promoted catalyst was able to enhance the formation of intermediate formate species by the plasma-excited CO₂. Consequently, the formed intermediate species facilitated the generation of CO by the reaction of formate and bicarbonate.
通过 DRIFTS 研究了等离子体下 -Al₂O₃ 和 Ce/Al₂O₃ 纳米催化剂对 CO₂ 转化的影响。CO₂ 在 -Al₂O₃ 纳米颗粒表面的吸附导致产生碳酸盐物种，其数量取决于温度。此外，我们证实碳酸盐的形成可以通过等离子体更有效地激活。Ce 纳米催化剂在等离子体下起到抑制 Al₂O₃ 表面碳酸盐生成的作用。事实上，当 Ce/Al₂O₃ 催化剂暴露于等离子体激发的 CO₂ 时，在 300°C 以上几乎消除了碳酸盐，从而提高了 CO₂ 的转化率。值得注意的是，等离子体激发的 CO₂ 促进了中间甲酸盐物种的形成。因此，形成的中间物种通过甲酸盐和碳酸氢盐的反应促进了 CO 的生成。
