Highly dispersed platinum nanoparticles (NPs) supported on alumina were prepared by supercritical fluid deposition (SFD) with the aid of co-solvent ethanol using inorganometallic Na₂PtCl₆·6H₂O as Pt precursor. The mean Pt particle size (1.5 nm) was obtained at the optimized deposition conditions of 40 °C and 110 bar and 3 h of deposition time. The catalysts were characterized by high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), CO diffuse reflectance infrared Fourier transform spectroscopy (CO-DRIFTS), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES) and hydrogen-oxygen titrations to investigate the structure-activity relationship. Compared with the catalyst prepared via an impregnation method, the Pt was highly dispersed to smaller particles for Pt/Al₂O₃ catalysts prepared by SFD and showed much higher catalytic activity of catalytic reforming of cyclohexane dehydrogenation.

利用无机金属Na ₂ PtCl ₆ ·6H ₂借助助溶剂乙醇，通过超临界流体沉积（SFD）制备了负载在氧化铝上的高度分散的铂纳米颗粒（NPs）。O作为Pt前体。在40°C和110 bar的最佳沉积条件下以及3 h的沉积时间下获得了平均Pt粒径（1.5 nm）。通过高分辨率透射电子显微镜（HR-TEM），X射线衍射（XRD），CO漫反射红外傅里叶变换光谱（CO-DRIFTS），X射线光电子能谱（XPS），电感耦合等离子体对催化剂进行了表征。发射光谱法（ICP-OES）和氢氧滴定法研究结构活性关系。与通过浸渍法制备的催化剂相比，对于通过SFD制备的Pt / Al ₂ O ₃催化剂，Pt高度分散成较小的颗粒，并且显示出更高的催化重整环己烷脱氢的催化活性。