Selective autocatalytic reduction of NO from sintering flue gas by the hot sintered ore in the presence of NH3.

Abstract In this paper, the selective autocatalytic reduction of NO by NH 3 combined with multi-metal oxides in the hot sintered ore was studied, and the catalytic activity of the hot sintered ore was investigated as a function of temperature, NH 3 /NO ratio, O 2 content, H 2 O and SO 2 . The experimental results indicated that the hot sintered ore, when combined with NH 3 , had a maximum denitration efficiency of 37.67% at 450 °C, 3000 h −1 gas hourly space velocity (GHSV) and a NH 3 /NO ratio of 0.4/1. Additionally, it was found that O 2 played an important role in removing NO x . However, high O 2 content had a negative effect on NO reduction. H 2 O was found to promote the denitration efficiency in the absence of SO 2 , while SO 2 inhibited the catalytic activity of the sintered ore. In the presence of H 2 O and SO 2 , the catalytic activity of the sintered ore was dramatically suppressed.