The active adsorbed states of nitrogen formed by NH_3 deco- mposition on Ru-Al_2O_3-K and Fe-Al_2O_3-K catalysts were investigated by IR spectroscopy.

• 用红外光谱法对Ru-Al_2O_3-K和Fe-Al_2O_3-K催化剂上氨分解生成氮的吸附态进行了考察。