Optimization of CuO@SiO2 core-shell catalysts for catalytic AsH3 oxidation

Eliminating arsine (AsH3) from arc-furnace off-gas is becoming increasingly urgent owing to its hypertoxicity and overburdened environment. Herein, a series of [email protected]2 core-shell catalysts were synthesized for catalytic AsH3 oxidation in simulated arc furnaces off-gas. The effects of the hydrothermal temperature, CuO amount, and ammonia concentration on the AsH3 removal performance of the [email protected]2 catalysts were investigated. After optimization, many physical and chemical properties of the [email protected]2 catalysts, including the active components, were improved, resulting in considerable performance in AsH3 oxidation. The [email protected]2 catalysts also exhibited robust AsH3 removal performance in the presence of high concentration CO or organic sulfur gas (COS and CS2). In contrast, the coexisting gases H2S and PH3 could occupy the active sites, leading to the degradation of the AsH3 removal performance over the [email protected]2 catalysts. This study provides a new route for deep purification of AsH3 from arc furnaces off-gas.