Producing a monolithic catalyst by manganese slag and its industrial application in catalytic oxidization of volatile organic compounds

Abstract

High-value-added utilization of heavy-metal-containing waste is important for the sustainable development because most resources are non-renewable. In this work, an effective catalyst for volatile organic compounds was synthesized from manganese slag. Furthermore, the powder catalyst was coated on cordierite, and the obtained monolithic catalyst (0.6 m3) was applied in a real application. As a result, the powder catalyst removed 90% of toluene at 300 °C; the monolithic catalyst removed 98% of real volatile organic compounds at 350 °C. The activity was only decreased to 84% even after 10-month running. After characterizations, a manganese-oxygen bond was recognized for the enhanced catalytic activity. The decrease of activity was due to the loss of this bond, which was attributed to local overheating during oxidization of volatile organic compounds. After all, the main results of this work helped to produce effective catalysts from low-cost materials, which was in favor of recycling economy and green development.