Simultaneous SOx/NOx removal in a fluidized bed reactor using natural manganese ore

In this experiment, the simultaneous removal of SO2 and NO from flue gases was investigated through the use of natural manganese ore as a sorbent-cata lyst in a fluidized bed reactor. Selective catalytic reduction behavior was determined as a function of the sulfation degree within the temperature ra nge from 100 degreesC to 500 degreesC. The natural manganese ore showed a h igh activity in the production of nitrogen and water by the reaction of nit ric oxide with ammonia and oxygen up to around 200 degreesC. At higher temp eratures, the nitric oxide removal efficiency decreased due to the oxidatio n of ammonia by oxygen. With the increase of sulfation degree, the temperat ure at which the maximum selective catalytic reduction of nitric oxide appe ars gradually increased, however the maximum nitric oxide removal efficienc y decreased. Additionally, we investigated the removal efficiency of sulfur dioxide and nitric oxide with reaction time in a batch fluidized bed react or within a temperature range of 350 degreesC to 500 degreesC. As the react ion temperature increased, the adsorption capacity of sulfur dioxide increa sed, but the nitric oxide removal efficiency decreased. (C) 2001 Society of Chemical Industry.