Peng Wu, Jianjun Chen, Yaping Zhang, Chang Wang, Jinxing Mi, Xiaoping Chen, Feifan Huang, Jiaying Xing, Shengpeng Mo, Junhua Li
Al 2 O 3 catalysts have been widely applied in the field of COS hydrolysis. However, the inferior low-temperature activity and insufficient stability limit its further application. Moreover, the coordination regulation strategy of Al sites and the optimization mechanism of the hydrolysis reaction still need to be explored in depth. In this paper, an Al 2 O 3 nanowire catalyst derived from NH 4 Al(OH) 2 CO 3 was synthesized. The preferred ACCH-K 0.1 Al 2 O 3 catalyst achieved more than 80% COS conversion at 75 °C and WHSV of 120,000 cm –3 g –1 h –1 . The characterization results demonstrated that the elevated proportion of unsaturated coordinated Al 3+ and doped K optimized the electron density of the Al sites, increased the surface −OH concentration, and constructed asymmetric oxygen vacancies, which enhanced the adsorption and activation ability of COS. In situ DRIFTS and theoretical calculations results verified that electron localization contributed to the preferred bond cleavage of COS and reduced the overall reaction energy barrier, which in turn promoted the catalytic hydrolytic activity at low temperatures. This investigation presents a reliable perspective and theoretical basis for the regulation of the Al coordination environment and the study of the reaction mechanism.