Reduction of CO₂ emissions and conversion of CO₂ to valuable chemicals is an urgent mission, as it is vital to the global environment and sustainable development. The activation of CO₂ is always considered to be the key step for its transformation. Herein, we verified that the activation and dissociation behavior of H₂ was the controlling step for CO₂ reduction. PdIn alloy was an active center and played a pivotal role in CO₂ hydrogenation to the methyl reagent of HCOO∗. H₂ split to active H^δ− species on PdIn alloy sites. Strong nucleophilic H^δ− reacted with the CO₂ adsorbed on oxygen defects to form ∗HCOO in situ. A high yield of up to 99% was achieved for the cascade fixation of CO₂ to valuable amines. The new insights into the activation of CO₂ and H₂ and their contributions to CO₂ conversion that we present will attract the attention of researchers in catalysis, synthesis, surface, and interface chemistry.

中文翻译：

---

PdIn/TiO2 催化剂上级联 CO2 固定中的氢解离和 CO2 活化


减少 CO₂ 排放并将 CO₂ 转化为有价值的化学品是一项紧迫的任务，因为它对全球环境和可持续发展至关重要。CO₂ 的活化始终被认为是其转化的关键步骤。在此，我们验证了 H₂ 的激活和解离行为是 CO₂ 还原的控制步骤。PdIn 合金是一个活性中心，在 CO₂ 加氢成 HCOO∗ 甲基试剂中起关键作用。H₂ 在 PdIn 合金位点上分裂成活性 H^δ− 物质。强亲核 H^δ− 与吸附在氧缺陷上的 CO₂ 反应，原位形成 ∗HCOO。将 CO₂ 级联固定到有价值的胺上实现了高达 99% 的高产率。我们提出的关于 CO₂ 和 H₂ 活化及其对 CO₂ 转化贡献的新见解将引起催化、合成、表面和界面化学研究人员的注意。