Lean NOx trap/conversion catalyst
    9.
    发明授权
    Lean NOx trap/conversion catalyst 失效
    精益NOx捕集/转化催化剂

    公开(公告)号:US07682583B2

    公开(公告)日:2010-03-23

    申请号:US10878240

    申请日:2004-06-28

    IPC分类号: B01D53/00

    摘要: A process and composition for converting nitrogen oxides present in exhaust gases produced by an internal combustion engine utilize cobalt and at least one alkali metal or alkaline earth metal as a component of an adsorbent. The process involves contacting the exhaust gas with an adsorbent which adsorbs the nitrogen oxides in lean-burn conditions and recurrently reducing the oxygen concentration of the exhaust gas. During such periods of reduced oxygen concentration, the nitrogen oxides are then desorbed and reduced to nitrogen, thereby reducing the concentration of the nitrogen oxides in the exhaust gas. The composition of the adsorbent comprises an oxide support and at least two components loaded on the support and containing cobalt and at least one alkali metal or alkaline earth metal. The composition demonstrates improved activity at higher temperatures and improved thermal stability.

    摘要翻译: 用于转化由内燃机产生的废气中存在的氮氧化物的方法和组合物使用钴和至少一种碱金属或碱土金属作为吸附剂的组分。 该方法包括使废气与在贫燃条件下吸附氮氧化物的吸附剂接触并且循环地降低废气的氧浓度。 在氧浓度降低的时期,氮氧化物然后解吸并还原成氮气,从而降低排气中氮氧化物的浓度。 吸附剂的组成包括氧化物载体和负载在载体上并含有钴和至少一种碱金属或碱土金属的至少两种组分。 该组合物显示出在较高温度下改善的活性和改善的热稳定性。