Abstract: The performance of NiMo/Al2O3 hydrogenation catalyst for removing SO2 and NO in presence of H2 was investigated under conditions of constant pressure, 100-600℃, oxygen/oxygen free atmospheres in a continuous tubular fixed bed reactor. The results showed that NiMo/Al2O3 catalyst has good simultaneous desulfurization and denitration performance. The SO2 conversion，elemental sulfur selectivity are higher than the value of desulfurization and denitration alone, the SO2 conversion increases with the increase of temperature, even as high as 100%, but N2 formation rate is lower than the value of separate denitration. Under oxygen atmosphere conditions，SO2 conversion，elemental sulfur selectivity，N2 yield are all better than that under oxygen free conditions. The presence of SO2 has an inhibitory effect on the adsorption of NO，and the presence of NO significantly improves SO2 conversion and elemental sulfur selectivity.

Key words: reduction, flue gas, desulfurization, denitration, hydrogenation catalyst, fixed-bed