Experimental Study On The DeNO_x Technology Of CH₄-SCR And CO-SCR Based On Copper-based Catalyst

NO are important atmospheric pollutants.It will not only cause photochemical smog and greenhouse effect on the natural environment pollution,but also seriously endanger human health.Therefore,reducing NOx emissions is very important.Catalytic reduction is the most mature technology reducing NOx emissions control method.NH3-SCR technology has been used industrially for the emission of fixed-source NOx.However,there are still some technical flaws in the NH3-SCR technology.Ammonia is difficult to store and transport,secondary pollution of ammonia,catalyst deactivation,only apply to the removal of NOx from fixed-sources,etc.CH4 and CO are excellent reductant,and CH4 is rich in origin,stable in nature,CO is present in most flue gas combustion flue gases.SCR technology with CH4,CO as reductant can solve the NH3-SCR technology defects.Therefore,if we can develop a low-efficient and highly efficient catalyst with CH4 and CO as reductant SCR technology,it will have broad application prospects and great economic value.In this paper,the Cu-based catalyst for CH4-SCR DeNOx performance was studied.The effects of copper content,promoters and its content on the DeNOx performance of the catalyst were studied.Then filtered out the best copper-based catalyst.The effect of CO pretreatment on Cu-based catalysts was investigated.Experiments were performed to investigate the NO removal activities of the catalysts affected by the flue gas conditions.Moreover,the catalysts were subjected to stability test and characterization.The results indicated that catalyst with 5%Cu possessed the highest NO removal activity.And the addition of 5%Co could promote the catalytic activity remarkably.The catalyst 5Cu-5CO/?-Al2O3 showed a relatively strong hydrothermal stability and ability to adapt to the adapt to GSHV,and the existence of O2 could promote the NO conversion reaction.The research on the copper-based catalyst for CO-SCR DeNOx performance was studied.The effect of copper content,promoters component and its content on the DeNOx performance of the catalyst was studied.Then filtered out the best copper-based catalyst.The effect of CO pretreatment on the Cu-based catalysts was also investigated.Experiments were performed to investigate the NO removal activities of the catalysts affected by the flue gas conditions.Moreover,the catalysts were subjected to stability test and characterization.The result showed that catalyst with 5%Cu possessed the highest NO removal activity.,and the addition of 3%Fe could promote the catalytic activity remarkably.Pretreatment could promote the occurrence of Cu single electron reduction of the active species in the catalyst,and obtain more Cu+ active species,which is favorable for the adsorption and desorption of the reactants.The catalyst 5Cu-3Fe/?-Al2O3 catalyst showed good flue gas condition adaptability.