Hydrogen adsorption on high surface area Cr2 O3 materials
| Autor: | Fan Jinglian, Yue-Juan Wang, Ling-yun Jin, Zunyun Xie, Yongxiang Cheng, Geng-shen Hu, Mengfei Luo, Ji-Qing Lu |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Phase transition
Materials science Hydrogen Precipitation (chemistry) Inorganic chemistry chemistry.chemical_element Surfaces and Interfaces Raw material Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Amorphous solid Adsorption Amorphous carbon chemistry law Materials Chemistry Calcination Electrical and Electronic Engineering |
| Zdroj: | physica status solidi (a). 210:1920-1924 |
| ISSN: | 1862-6300 |
| DOI: | 10.1002/pssa.201329229 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text