摘要
Abstract
To improve the sulfur and water resistance of conventional Mn-based low-temperature SCR catalysts,the MnOx-CeO2/TiO2 catalyst was synthesized via a co-precipitation method.The effects of preparation method,Ce modification,and process parameters on denitrification performance at 150-250 ℃were investigated,and the energy-saving and carbon-reduction benefits were quantitatively evaluated.Results showed that the co-precipitation method constructed a strong metal-support interaction,promoting high dispersion of active components,while the introduction of CeO2 significantly enhanced low-temperature activity and anti-poisoning capability through Mn-O-Ce solid solution formation and redox cycle synergy.Under conditions of 210 ℃,a space velocity of 30 000 h-1,and NH3/NOx=1.0,the 8 wt％MnOx-2 wt％CeO2/TiO2 catalyst achieved 95.9％NOx conversion and 98.3％N2 selectivity,retaining 72.8％conversion after 24 h exposure to SO2 and H2O,far superior to the unmodified catalyst(54.9％).Compared with conventional high-temperature SCR,this technology reduces energy consumption by 50.6％,cuts CO2 emissions by 450 kg per ton of NOx treated,and lowers unit denitrification cost to 3.5 CNY/kg-NOx.关键词
MnOx-CeO2/TiO2催化剂/焦炉烟气/低温脱硝/节能减碳Key words
MnOx-CeO2/TiO2 catalyst/coke oven flue gas/low-temperature denitrification/energy saving and carbon reduction分类
资源环境
