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

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. [ABSTRACT FROM AUTHOR]