CAJ | 학술논문

主要讨论在不同反应温度和不同水蒸汽浓度下,新型的NOx储存-还原催化剂12CaO·7Al2O3/10%K(简称C12A7/K)中水的存远訬O还原性能的影响.研究结果表明,当存在1.2%水蒸汽,并低于500 ℃时,NO转化率和N2的选择性均降低,水蒸汽的存在对催化剂低温区的活性起到较明显的抑制作用;而温度高于500 ℃时,此抑制作用则基本消失,说明此时C12A7/K催化剂的水热稳定性较好.FT-IR结果证明储存NOx后的C12A7/K样品中形成了NO3/NO2的反应中间物种,用H2还原则可消除中间物种,以N2等形式放出.
주요토론재불동반응온도화불동수증기농도하,신형적NOx저존-환원최화제12CaO·7Al2O3/10%K(간칭C12A7/K)중수적존원초O환원성능적영향.연구결과표명,당존재1.2%수증기,병저우500 ℃시,NO전화솔화N2적선택성균강저,수증기적존재대최화제저온구적활성기도교명현적억제작용;이온도고우500 ℃시,차억제작용칙기본소실,설명차시C12A7/K최화제적수열은정성교호.FT-IR결과증명저존NOx후적C12A7/K양품중형성료NO3/NO2적반응중간물충,용H2환원칙가소제중간물충,이N2등형식방출.
A uovel NOx storage/reduction catalyst 12CaO·7Al2O3/10%K, defined as C12A7/K, was prepared, which possesses good NOx storage/reduction ability with a high sulfur-tolerance. The effect of H2O on the NO reduction features over the C12A7/K catalyst was investigated. The NO conversion and the N2 selectivity were measured as a function of temperature and H2O concentration. In the presence of 1.2% H2O, both the NO conversion and the N2 selectivity significantly decrease at lower temperature region (＜500 ℃).At temperatures over 500 ℃, however, the NO reduction is only slightly influenced by H2O. The species of NO3-/NO2- are confirmed as main storage components in the C12A7/K catalyst, which are further reduced into N2 by H2 under the reduction conditions.