Treating gas containing nitrogen oxide which generates reduction reaction of nitrogen oxide by nitrogenized reducing agent using catalyst system containing composition e.g. zirconium, cerium and niobium with cerium oxide

摘要

Treating a gas containing nitrogen oxide which generates a reduction reaction of nitrogen oxide by a nitrogenized reducing agent used in this reduction reaction catalyst system containing a composition comprising zirconium, cerium and niobium with cerium oxide (5-50 wt.%), niobium oxide (5-20 wt.%) and zirconium oxide, is claimed, where the balance is in an extruded form.