Research progress of selective catalytic reduction of NOx at medium-low temperature

Research progress of selective catalytic reduction（SCR）of NO_x with noble metals，molecular sieves，carbon-based and metal oxides catalysts at a medium-low temperature is summarized，providing up-to-date information of catalysts for the catalytic denitrification of industrial kiln flue gas. This paper analyzes the characteristics of various catalysts，especially modification of catalyst，sulfur-tolerant，water-resistant catalysts and reaction mechanism. In order to apply SCR technology to industrial kiln flue gas denitrification，the outstanding performance of active components in catalystic activity at a medium-low temperature，sulfur-tolerance，water-resistance and so on should be made full use of. Modification of mature SCR catalyst with transition metal oxides to improve activity and anti-poisoning ability would have better research and development prospect.