Selective catalytic reduction (SCR) with ammonia is the most effective, and the only commercially available, catalytic technology for the post combustion control of nitrogen oxides (NOx) from stationary sources (1). Development of an active low-temperature SCR catalyst is attractive because it may allow greater flexibility in the placement of the SCR reactor in the flue gas stream and thus has the potential to reduce overall cost and improve efficiency. Recently, amorphous chromia (2) has been shown to be a highly active and selective catalyst for the reduction of nitric oxide with ammonia in the presence of excess O2 for temperatures below 180°C. The performance of chromia catalysts is, however, dependent on the crystalline form, since by contrast, crystalline chromia (α-Cr2O3) gives rise to substantial nitrous oxide at all temperatures and also exhibits considerable activity for ammonia oxidation.
|Number of pages||4|
|Journal||American Chemical Society, Division of Petroleum Chemistry, Preprints|
|Publication status||Published - Feb 1994|