The gradual rise in CO₂ emission urged the search for different techniques not only to capture the CO₂ gas but also transform the same in useful chemicals such as formic acid. In the present study, we established an effective protocol to support Ru NPs on amine-functionalized SBA-15 mesoporous silica and further utilized them as catalysts for the direct hydrogenation of CO₂ gas into the formic acid. The presence of organoamine groups around the Ru NPs plays a significant role to stabilize the Ru NPs followed by strong metal-molecular support interaction (between Ru NPs and SBA-15) and delivering the improved catalytic activities for the easy CO₂ reduction into the formic acid formation. We reported a comprehensive study on the impacts of various amine groups on the catalytic performance of amine-functionalized SBA-15 supported Ru catalysts for formic acid formation. We also demonstrated a comprehensive study of different amine groups on the catalytic performance of ultrafine uniformly dispersed Ru NPs over mesoporous SBA-15 support. The effect of various compositional and steric properties of amine groups on the size/distribution of the Ru NPs were closely studied and correlated with their catalytic performance in the CO₂ hydrogenation reaction. We successfully recycled the catalysts up to five runs with good catalytic activity.

CO ₂排放量的逐渐上升促使人们寻求不同的技术，不仅要捕获CO ₂气体，还要将其转化成有用的化学药品（例如甲酸）。在本研究中，我们建立了一种有效的方案，以在胺官能化的SBA-15中孔二氧化硅上支持Ru NP，并将它们进一步用作将CO ₂气体直接加氢成甲酸的催化剂。Ru NP周围有机胺基团的存在对稳定Ru NP具有重要作用，随后稳定的金属-分子支持相互作用（Ru NP和SBA-15之间）并为易产生的CO ₂提供改进的催化活性。还原成甲酸形成。我们报道了有关各种胺基对胺官能化SBA-15负载Ru甲酸形成甲酸催化剂催化性能的影响的综合研究。我们还证明了不同胺基对超细均匀分散的Ru NPs在介孔SBA-15载体上的催化性能的全面研究。密切研究了胺基的各种组成和空间性质对Ru NPs尺寸/分布的影响，并将其与它们在CO ₂加氢反应中的催化性能相关。我们成功地将催化剂循环了五次，具有良好的催化活性。