Synthesis of a perovskite-type catalyst from Cr electroplating sludge for effective catalytic oxidization of VOC

Abstract

Chromium-containing electroplating sludge usually lacked proper disposal and recycling. High-temperature melting was a technology aiming to form glass-phase slag for the stabilizations of heavy metals. This work investigated the possibility of forming perovskite-like phase by chromium-containing sludge using high-temperature melting. The formed material was applied in catalytic oxidization of volatile organic compound. As a result, Ca²⁺-doped LaCrO₃ was formed according to XRD and HRTEM. When Ca²⁺ doping reached 33%, i.e., La_0.67Ca_0.33CrO₃, surface oxygen species of the obtained catalyst was increased to 65.7%, which was detected by XPS, resulting in a toluene removal of 50% at 302 °C. Besides, the activity was stable for over 50 h. In addition, the doping amount was as high as 40 mol% of Cr in the catalyst. Based on these results, a high-value-added catalyst was produced by the hazardous waste, which was in favor of hazardous-waste recycling as well as high-temperature-melting development.

Keywords: Catalytic oxidization; Electroplating sludge; High-temperature melting; Perovskite; Volatile organic compound.