- JAPAN PETROLEUM INST
Nitrogen oxide (NOx) is the main pollutant produced from power plants and boiler. The development of catalysts that can work to reduce NOx under ambient conditions at a low reaction temperature has been required. In this work, we examined the NH3-selective catalytic reduction (SCR) activity of metal oxide-supported gold catalysts in order to develop NH3-SCR catalysts working at low temperatures ( < 200 degrees C). Au/CuO showed NH3-SCR activity at 100 degrees C (NO conversion = 20 %, N-2 selectivity = ca. 100 %), though the production of N2O as a by-product caused by NH3 oxidation was observed at a higher reaction temperature. We found that deposition of 0.1 wt% of gold on CuO is sufficient for NH3-SCR to proceed and that NH3 oxidation proceeds with increase in the loading amount of gold (< 0.5 %) at a high reaction temperature. Although we measured the NH3-SCR activities of Pt/CuO and Pd/CuO, Au/CuO showed better activity than those of other precious metal catalysts. We also tested binary metal oxide-supported gold catalysts and found that 1 wt%Au/10 wt%CuO/Al2O3 showed the largest N-2 yield (45 %) owing to the introduction of other metal oxide species to CuO. The results indicated that a gold catalyst has the potential to catalyze NH3-SCR at low temperatures.
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