Ir基纳米催化剂的调控制备及在贫燃条件下NOx还原反应作用机理

At present, the removal of NOx under lean burn condition is the hotpot and big challenge in the environmental catalysis field. In this project, we propose the regulatable preparation of Ir and Rh1-xIrx nano-catalysts with the UAMR method which is granted patent. The metal dispersion of the Ir/Rh nanoparticles on the support would be enhanced through the interaction between the bimetal and the support material, leading the high N2 selectivity and the wide work window as well as the low cost of the catalysts. The adsorption of the CO, N2 and O2 molecules on the catalysts surface will be investigated with the in-situ DRIFT approach, and then the reaction mechanism between CO and N2 with the excess O2 will be proposed.

贫燃条件下NOx的消除是目前环境催化领域研究的一个热点和难点问题。针对此问题，本项目拟采用具有自主知识产权的UAMR法制备结构可调控的Ir和Rh1-xIrx纳米催化剂，利用双金属以及与载体间的相互作用提高纳米粒子在催化剂表面的金属分散度，实现贫燃条件下N2高选择性，拓宽催化剂的工作窗口，同时降低贵金属Rh用量，减少催化剂制备成本。通过in-situ DRIFT等手段研究反应物CO、NO和O2分子在催化剂表面的吸附行为，推测贫燃条件下CO还原NO的反应机理。

贫燃条件下NOx的消除是目前环境催化领域研究的一个热点和难点问题。针对此问题，本项目采用UAMR法等方法制备结构可调控的Ir基纳米催化剂，提高了纳米粒子在催化剂表面的金属分散度，实现了贫燃条件下N2高选择性。通过in-situ DRIFT等手段研究了反应物分子在催化剂表面的吸附行为，推测贫燃条件下CO还原NO的反应机理。可控制备了Pt单金属纳米粒子及负载型催化剂，与Ir基负载催化剂性能进行比较。另设计了掺杂MgO的六方氮化硼（MgO-h-BN）纳米材料作为钯（Pd）催化剂用于CO氧化反应的载体，研究了载体掺杂及氧空位缺陷对催化活性的影响。