Synergy effects of Mo2C and AC on the structure and catalytic performance of Mo2C/AC for NO2 to NO

Abstract

AbstractBackgroundResearch on catalysts for the efficient conversion of NO2 to NO is of great significance for the accurate determination of NO2 concentration and the reduction of environmental pollution. The present work investigated the synergistic interaction between coconut shell activated carbon (AC) and Mo2C, along with the catalytic performance of NO2 to NO. The aim of this study was to prepare a composite catalyst with activated carbon as the support to improve the conversion of NO2 at low temperatures. The effect of Mo loading w(Mo) on the reaction performance of NO2 to NO was studied by technical analysis, and the internal mechanism of Mo2C/AC for improving the reaction activity of the catalyst was revealed to provide a reference for the development of new efficient NO2 converting agents.ResultsCommercially available Mo2C, AC, and Mo2C/AC catalysts can convert NO2 to NO under reaction test conditions. When the gas flow rate is 1.5 L/min and the temperature is 250°C, the NO2 conversion rates of 5‐Mo2C/AC, 10‐Mo2C/AC, 15‐Mo2C/AC, and 20‐Mo2C/AC are 96.1%, 97.8%, 97.0%, and 93.2%, respectively.  The NO2 conversion rates of 10‐Mo2C/AC is about 4 times that of Mo2C and 1.1 times that of AC at 250 °C.ConclusionThe Mo2C/AC catalyst is rich in micropores and provides a reaction vessel for the conversion of NO2 to NO. AC with high specific surface area can not only change the dispersion and particle size of Mo2C species on the catalyst surface, but also adjust the NOx desorption performance of the catalyst. The synergism between the AC and Mo2C of Mo2C/AC provides more active sites for NO2 to NO, improving the reaction performance of the catalyst. © 2023 Society of Chemical Industry (SCI).