| Summary: | Different variants for abatement of N<sub>2</sub>O emission from nitric acid plants with the use of catalysts developed at Łukasiewicz-INS were analyzed. Activity tests on a pilot scale confirmed the high activity of the studied catalysts. A two-stage catalytic abatement of N<sub>2</sub>O emission in nitric acid plants was proposed: by high-temperature decomposition in the nitrous gases stream (HT-deN<sub>2</sub>O) and low-temperature decomposition in the tail gas stream (LT-deN<sub>2</sub>O). The selection of the optimal variant for abatement of N<sub>2</sub>O emission depends on the individual characteristics of the nitric acid plant: ammonia oxidation parameters, construction of ammonia oxidation reactor and temperature of the tail gas upstream of the expansion turbine. It was shown that the combination of both deN<sub>2</sub>O technologies, taking into account their technological constraints (dimensions of the catalyst bed), allows for a greater abatement of N<sub>2</sub>O emission, than the use of only one technology. This solution may be economically advantageous regarding the high prices of CO<sub>2</sub> emission allowances.
|
|---|