Study on copper-based oxygen carrier catalytic power plant flue gas deoxidation

Abstract

The main components of power plant flue gas are N₂, CO₂ and part O₂. Injecting power plant flue gas into mine goaf can achieve CO₂ storage and replace nitrogen injection to prevent spontaneous combustion of left coal. However, O₂ in flue gas is one of the factors causing spontaneous combustion of left coal. Therefore, it is urgent to develop an economical and effective catalyst to remove O₂ from power plant flue gas. In this study, four types of copper-based catalysts were prepared using a controllable modulating support and loading capacity through co-precipitation method. Additionally, a series of CuO/CeO₂ catalysts were prepared. The catalysts were characterized using BET, XRD, ICP, TEM, H₂-TPR and XPS to establish a structure-activity relationship of catalyst. The results showed that the addition of CeO₂ enhanced the dispersion of CuO, increased the oxygen vacancy in the catalyst, and improved the activity and reduction-oxidation performance of the catalyst. Moreover, the synergistic effect of Cu-Ce interface structure promoted the redox process, showing good activity and cycle stability. Among the catalysts, the 30CuO/CeO₂ sample showed the best catalytic deoxidation performance owing to its smallest CuO particle size, highest dispersion and oxygen vacancy concentration. The results of this study provide a reference for the development of low cost, recyclable, high activity and stability deoxidation catalysts.