This work focuses on Ga promotion to Co sites in supported CoGa catalysts on CO insertion and C–C coupling in syngas conversion. The CoGa catalysts were developed in our group for syngas conversion; they possess uniform dispersion of CoGa particles and pseudo-homogeneous distribution of Co and Ga elements. The Ga atoms contiguous to Co atoms not only contributed to isolating Co centers but also donated electrons to neighboring Co sites. The isolated Co sites were responsible for linearly nondissociative CO adsorption, boosting the CO insertion step to afford alcohol products. Electronic donation from Ga to Co sites promoted dissociative CO adsorption, enhancing carbon-chain growth. The match of CO insertion and C–C coupling gave rise to both enhanced activity in the syngas conversion and impressive selectivity to ethanol and higher alcohols.

这项工作的重点是在合成气转化中，通过CO插入和CC耦合将负载的CoGa催化剂中的Ga提升到Co位。CoGa催化剂是我们小组中开发的用于合成气转化的催化剂。它们具有CoGa颗粒的均匀分散以及Co和Ga元素的假均质分布。与Co原子相邻的Ga原子不仅有助于隔离Co中心，而且还向相邻的Co位置提供了电子。分离出的Co位点负责线性非解离性CO的吸附，从而促进了CO的插入步骤，从而提供了醇类产物。从Ga向Co位置的电子捐赠促进了离解性CO吸附，增强了碳链的生长。CO插入和CC偶联的匹配提高了合成气转化的活性，并提高了对乙醇和高级醇的选择性。