Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

Abstract

Simultaneous adsorption of NO and SO 2 on activated carbon provides an adequate alternative to control the low concentration emissions of these air pollutants. The surface complexes formed during the NO and SO 2 adsorptions at 30 °C were studied by X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The effects of the addition of copper supported on the carbon and O 2 on the gas stream were studied. The presence of copper enhanced the chemical adsorption of both NO and SO 2 . In the simultaneous adsorption of NO and SO 2 , SO 2 inhibited the adsorption of NO, while SO 2 adsorption was notably improved. The reaction carried out under a NO/SO 2 /O 2 gas mixture showed a synergic effect increasing the formation of surface complexes. The addition of copper assisted the oxygen transfer to the carbon matrix.

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