T. Grzybek et al., Selective catalytic reduction of nitric oxide with ammonia on Mn-promoted carbonized used silica-alumina sorbents, CATAL LETT, 63(1-2), 1999, pp. 107-111
Deactivated (waste) silica-alumina sorbents were carbonized and used as sup
ports. The introduction of manganese led to active and selective SCR cataly
sts at low temperatures. Two methods of Mn promoting were compared: wet imp
regnation and adsorption. They influenced the distribution of Mn and N2O pr
oduction. The catalysts behaved similarly to Mn-promoted active carbon.