공존 환원제가 NOx 흡장촉매의 NOx 흡ㆍ탈착에 미치는 영향

The behavior of NOx adsorption and desorption of the NOx storage catalyst supported on Ba additive were studied by the TPA/TPD experiments and reactivity tests. Applying the transient responses and NOx TPA/TPD test by CLD were effective methods to analyze the characteristics of the NOx storage catalyst. NOx variation of the NOx storage catalyst in the lean air/fuel conditions according to temperature was dominated by NOx adsorption and desorption rather than catalytic reduction. The presence of reductants in the lean mixture promoted the NOx desorption at the 500℃ higher temperature. The temperatures for maximum NOx conversion with CH4 and C₃H_6 as a rich spike reductant appear around 500℃ and 400℃ respectively.