Hydrogen adsorption on high surface area Cr₂ O₃ materials

Abstract

Amorphous Cr2O3 materials with high surface areas were prepared via a precipitation process with CrCl3 · 6H2O as the raw material, (NH4)2CO3, NH3 · H2O, and KOH as precipitating agents. Calcination of Cr(OH)3 precipitation at low temperatures (300–400 °C) resulted in amorphous Cr2O3 materials with high surface areas, while high‐temperature calcination (500–600 °C) led to crystalline Cr2O3. The hydrogen‐adsorption phenomenon was clearly observed in a hydrogen atmosphere on the amorphous Cr2O3 materials with high surface area. The adsorbed hydrogen desorbed at about 550 °C due to the phase transition from amorphous to crystalline. However, this phenomenon was not observed for crystalline Cr2O3.

Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane

“…The results are in good agreement with the XRD results. Besides, one very weak band centered at 1000 cm -1 assigned to CrO 3 is observed [36], agreeing with the H 2 -TPR and XPS results. Similar bands are also observed in the fresh Cr 2 O 3 -P catalyst.…”