Preparation, crystal structure, thermal and catalytical behaviour of copper diammine divanadate
| Autor: | Armin Reller, S. Aschwanden, Helmut W. Schmalle, H.R. Oswald |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Chemistry
Stereochemistry Scanning electron microscope Mechanical Engineering Thermal decomposition Oxide chemistry.chemical_element Crystal structure Condensed Matter Physics Copper Thermogravimetry Crystallography chemistry.chemical_compound Mechanics of Materials X-ray crystallography General Materials Science Monoclinic crystal system |
| Zdroj: | Materials Research Bulletin. 28:45-58 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/0025-5408(93)90007-z |
| Popis: | A new copper diammine divanadate Cu(NH 3 ) 2 (VO 3 ) 2 has been synthesized and structurally characterized. The unit cell is monoclinic, space group Pc, a = 5.616(2) A , b = 5.591(1) A , c = 11.331(2) A , β = 90.91(2)°, V = 355.7(3) A 3 , Z = 2. The thermal decomposition has been studied by thermogravimetry and simultaneous mass spectrometry (TG/MS) in different atmospheres, i.e. H 2 , N 2 , He and O 2 . As solid products elemental copper on V 2 O 3 , Cu 0.95 V 2 O 5 and CuV 2 O 6 have been obtained, and depending on the actual atmosphere different volatile products such as NH 3 , H 2 O and N 2 . Independent of the pretreatment, reoxidation of the product phases leads to the ternary oxide CuV 2 O 6 . The microstructures have been characterized by scanning electron microscopy (SEM) and high resolution electron microscopy (HREM). The product decomposed in hydrogen has been tested with respect to its catalytic activity for the reduction of NO with CO. |
| Databáze: | OpenAIRE |
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