Preparation of platinum nanoparticles supported on resorcinol-formaldehyde carbon cryogel microspheres

Highly dispersed platinum nanoparticles were prepared using resorcinol-formaldehyde cryogel microspheres (RCM) or carbon cryogel microspheres (CCM) with controlled porous structures as the supporting materials. The size of the supported Pt nanoparticles decreased with the increase in the mesopore size of the RCM and the porous properties of the RCM decreased after loading Pt. Pt catalysts supported on CCM (Pt/CCM) showed high metal dispersion over 3 3 % and Pt particles with the size of 2.7 similar to 3.4 nm could be supported on the CCM. The mesoporosity of the CCM hardly changed after impregnation of the Pt precursor. The mean particle sizes of Pt dispersed on the RCM and CCM increased with an increase in the calcination temperature; Pt/RCM showed higher thermal stability than Pt/CCM. The metal dispersion of Pt/RCM increased with an increase in the oxidation temperature; the highest metal dispersion (16 %) was obtained at 195 degrees C. The mean particle size of Pt supported on CCM could be changed within the range 2.7 similar to 17.7 ran by varying the loading ratio of Pt in the range 1.2 similar to 10 wt%.