Performance evaluation of Mn-Ce/cordierite catalyst modified by green surfactant to remove NOx in underground mines at low temperatures

Abstract

An environment-friendly and low temperature performance catalyst is important to protect the working environment under the mine. We choose cordierite as the carrier of catalyst and modified by green surfactant to increase the specific surface area and catalytic activity, which also provides environmental protection for the catalyst. The most suitable surfactant is selected based on its saturated adsorption curve, surface tension, and denitration efficiency. Analyze the adsorption process of surfactant molecules on cordierite surface and the micro mechanism of improving the removal rate of NOx. In order to improve the NOx removal rate to a step further, the surfactant is used as a coating to prepare a new Mn-Ce/surfactant-cordierite monolithic catalyst, which is characterized by Fourier transform infrared spectroscopy, energy-dispersive x-ray spectroscopy, X-ray diffraction, and H2 temperature programmed reduction. Its selective catalytic reduction and denitration activity are studied. Experimental results: (1)Green surfactants can effectively improve the conversion efficiency of cordierite for NOx.(2)Among the four surfactants, cetyltrimethyl ammonium bromide (CTAB) can most significantly improve the conversion efficiency of NOx and its optimum concentration is 0.04%.(3)The NOx removal efficiency of the new Mn-Ce/CTAB-cordierite monolithic catalyst can reach 95% at 150 ℃.