Influence of Heat Treatment Conditions on the Physicochemical and Catalytic Properties of a Chromium Containing Catalyst for Tetrachloroethylene Hydrofluorination to Pentafluoroethane
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584
, E-ISSN: 1608-3210
|
| Output data |
Year: 2011,
Volume: 52,
Number: 3,
Pages: 418-426
Pages count
: 9
DOI:
10.1134/S0023158411030189
|
| Authors |
Simonova L.G.
1
,
Zirka A.A.
1
,
Reshetnikov S.I.
1
,
Larina T.V.
1
,
Litvak G.S.
1
,
Pinaeva L.G.
1
,
Isupova L.A.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
|
The physicochemical properties of coprecipitated 95% Cr2O3-5% Al2O3 oxide systems obtained by heat treatment of the precursor in nitrogen and air between 110 and 600°C and their influence on the catalytic activity in tetrachloroethylene hydrofluorination were studied by thermal and X-ray diffraction analyses, diffuse reflectance spectroscopy, and specific surface are measurements. The CrO1.9 compounds are more active than CrO1.5, but their preparation in the finely divided state is difficult because of the high exothermicity of the oxidation stage, which results in the decomposition of the oxides CrO1.9 and CrO1.5 followed by the crystallization and sintering of the decomposition products. Fine-powder and highly active chromium-containing oxides with CrO1.9 stoichiometry can be obtained by two-stage heating of hydroxides first in nitrogen and then in air at comparatively low temperatures.