Abstract
Selective catalytic reduction (SCR) of nitrogen oxides with an activated carbon-supported zero-valent iron catalyst is a method for removing NO under low temperature, which can remove CO and NO simultaneously. In the present study, the thermodynamics of low temperature denitrification was analyzed. By means of X-ray diffraction and Brunner-Emmet-Teller (BET) measurements, the phase and structure of the catalyst were thoroughly investigated. To determine the activity of the catalyst, a series of catalytic performance tests were carried out. The results indicated that the catalyst can act on the chemical reactions during the low-temperature denitrification process. An increase in the iron loading covered the micropores, resulting in a smaller specific surface area, which had little influence on the total pore volume. Moreover, activated carbon provided a carrier structure for iron and reduced NO simultaneously. The reduction of NO with activated carbon to N(2) was the main reaction. By the oxidation of iron and the reduction of activated carbon, the activity of the catalyst decreased.