钯/铁铬铝烧结毡整体催化剂表征及对甲苯催化性能研究

采用新型的化学镀技术在铁铬铝（FeCrAl）烧结毡上直接负载贵金属钯（Pd），制备了不同钯负载量的无过渡涂层的钯基整体式燃烧催化剂。首先对该类催化剂进行扫描电镜（SEM）、能谱（EDS）和X射线衍射（XRD）表征分析，结果表明：采用化学镀技术，钯组分能够很好地在铁铬铝烧结毡基体表面富集，催化剂的活性中心主要以金属钯晶相形式存在；而且在钯负载量为0.3%（质量分数）时，钯组分以0.3~0.5 μm的规整球状颗粒恰好在基体表面均匀分散并覆盖完全。同时该类催化剂在甲苯催化净化反应中表现出很好的低温催化性能，可使甲苯在190 ℃起燃后，在220 ℃就迅速达到100%完全转化，而且催化剂也显示出良好的催化稳定性。

Characterization of Pd/FeCrAl fiber monolithic catalysts and catalytic combustion properties of toluene thereof

The FeCrAl fiber supported palladium-based monolithic catalysts without interlayer coating were prepared by the noval electroless plating technique.The synthesized catalysts with different loaded Pd were firstly characterized by scanning electron microscope（SEM），X-ray diffraction（XRD），and energy dispersive spectrometer（EDS）.The results showed that the palladium component can be well enriched on the surface of the FeCrAl fiber substrate，and the main active center of the catalysts was metal Pd crystalline phase.When the palladium loading was 0.3%（mass fraction），the Pd spherical particles with 0.3~0.5 μm could form an uniform distribution and just cover the whole surface of the FeCrAl substrate.Meanwhile，the synthesized catalysts also showed excellent performance of toluene catalytic combustion: the toluene could rapidly burn out at 220 ℃ after light-off at 190 ℃ over the synthesized catalyst，and the catalyst also expressed good catalytic stability.