Abstract
Rice straw char and sewage sludge char were applied as catalysts for selective catalytic reduction between 50 and 250 °C using ammonia as the reducing agent. Each char was activated physically, using water vapor, or chemically, using KOH. The characteristics of the prepared catalysts were analyzed through elemental analysis, N 2 adsorption–desorption, FT-IR, NO-TPD, NH 3-TPD, and NO x removal efficiency. The physically activated chars showed characteristics similar to those of the non-activated chars, whereas the chemically activated chars exhibited increased specific surface areas, pore volumes, NO adsorption capacities, NH 3 adsorption capacities, and oxygen functional group amounts, leading to higher NO x removal efficiency. When the catalysts were impregnated with 3 wt% manganese, NO x removal efficiency significantly increased. In particular, the NO x removal efficiency was highest when the chemically activated chars were impregnated with manganese.
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