现有柴油车后处理催化剂起活温度高（> 200度），无法消除车辆冷启动阶段（< 200度）排放的NO和碳氢化合物（HCs）。Pd/SSZ-13能够在低温下同时吸附储存NO和低碳链HCs（C2-C4），减少污染物排放；其还可作为氧化型催化剂，在中高温区内（> 200度）氧化低碳链HCs。而长碳链HCs（C5-C12）在尾气总HCs中的占比高达40%，拓展Pd/SSZ-13在NO+长碳链HCs（以正癸烷为模型化合物）低温共吸附及长碳链HCs高温氧化中的应用十分必要，而精准构建具有微介孔结构的Pd/meso-SSZ-13是实现这一过程的关键。本项目探究制备条件对Pd/meso-SSZ-13性质的影响规律，实现对催化剂孔径尺寸、Pd种类和分布的精密调控，评价催化剂结构和组成对其吸附和氧化性能的影响，阐释NO+正癸烷在催化剂上的低温吸附机理，明确催化剂作用下正癸烷的高温氧化机理。

The after-treatment catalysts for diesel vehicles only active above 200 °C, which can not control the NO and hydrocarbons emission during cold-start with the temperature below 200 °C. Pd/SSZ-13 is able to simultaneously adsorb the NO and low-chain hydrocarbons (C2-C4) at low temperatures, reducing the vehicle emissions during cold-start; in addition, Pd/SSZ-13 is also a kind of diesel oxidation catalysts, which oxidized the hydrocarbons in 200-500 °C. The exhaust also contains a large number of long-chain hydrocarbons (C5-C12) (40% in total hydrocarbons) . It is therefore meaningful to expand the application of Pd/SSZ-13 in simultaneously adsorbing the NO and long-chain HCs (decane as the representative hydrocarbon) at low temperatures as well as the oxidation of long-chain hydrocarbons at high temperatures. Introducing mesopores into microporous SSZ-13 helps to resolve this issue. The effect of preparation conditions on characteristics of Pd/meo-SSZ-13 will be investigated, and pore size, the distribution of Pd, and the state of Pd in Pd/meso-SSZ-13 will be controllable constructed. The adsorption capacity and oxidation ability will be evaluated. The mechanism of simultaneous adsorption of NO+decane will be proposed. The pathway of the oxidation of decane will be revealed.