In Situ Fourier Transform Infrared Investigation on the Low-Level Carbon Dioxide Conversion over a Nickel/Titanium Dioxide Catalyst

作者：Xueyi Yang, Junlei Zhang, Weiping Liu, Chaoyong Yang, Wang Dong · 发表于：ACS Applied Materials & Interfaces · 年份：2024 · DOI：10.1021/acsami.4c08223 · 被引用次数：9 · 研究领域：Catalytic Processes in Materials Science、Catalysts for Methane Reforming、Catalysis and Oxidation Reactions

Efficiently converting atmospheric carbon dioxide (CO 2 ) is crucial for sustainable human development. In this study, we conducted systematic in situ Fourier transform infrared tests to examine how hydrogen (H 2 ) partial pressure affects the conversion of low-level CO 2 (around 400 ppm) using nickel/titanium dioxide (Ni/TiO 2 ). Results show that increasing H 2 partial pressure significantly increases surface monodentate formate species, leading to enhanced methane (CH 4 ) production at both 250 and 400 °C. Conversely, on Ni’s surface, the key species are formyls and bidentate formate at 250 °C, but these decrease significantly at 400 °C. These findings indicate that low-level CO 2 is more easily converted to CH 4 over Ni/TiO 2 than Ni, regardless of temperature. Additionally, the strong Ni–TiO 2 interaction gives Ni/TiO 2 an advantage in converting low CO 2 concentrations, with excellent durability even at 400 °C. This study enhances our understanding of direct CO 2 conversion and aids in the development of advanced CO 2 emission reduction technologies.