LaCoO₃ 페롭스카이트형 산화물 촉매에서의 NO 분해 및 환원반응에 미치는 CO의 영향을 초고진공하에서 열탈착 실험을 통하여 조사하였다. 흡착되는 NO중 약 70%는 LaCoO₃ 표면의 Co³⁺에 분자상태로 흡착하였으며, 나머지는 산소결함에 분해흡착하여 표면 complex를 형성하였다. Co³⁺에 분자상태로 흡착한 NO는 그 일부가 450K에서 최대 탈착속도를 보였으며, 나머지는 분해되어 N₂ 및 N₂O를 생성하였다. 선흡착된 CO가 후흡착되는 NO의 분해 및 환원에 큰 영향을 미치지 못한 반면, 후흡착된 α-CO₂로 탈착함으로써 NO의 분해를 촉진하였고, NO의 dimer나 chelate형 흡착물의 산소를 이용하여 후흡착된 β-CO는 β-CO₂를 생성하여 탈착함으로써 N₂의 생성을 촉진하였다.

NO decomposition and NO reduction by CO on LaCoO₃ perovskite catalyst have been studied using the technique of thermal desorption spectrometry(TDS)under ultrahigh vacuum(UHV) condition at the adsorption temperature of 300K. About 70% of NO adsorbed molecularly on Co³⁺ ion, and the others adsorbed dissociatively on oxygen vacancy and formed various surface complexes. A part of NO adsorbed on Co³⁺ showed maximum desorption rate at 450K, and the others decomposed to form N₂ or N₂O. Pre-adsorbed CO gave little effect on NO dissociation, but in the case of pre-adsorption of NO, the post-dosed CO promoted both the dissociation of NO and the formation of N₂. The post-dosed α-CO reacted with NO adsorbed on Co³⁺ and desorbed as α-CO₂ resulting in the enhancement of NO dissociation. And the post-dosed β-CO, which adsorbed on the oxygen of the complex, also promoted the formation of N₂ by desorbing as β-CO₂.

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