Characterization of Chromia-Promoted γ-Iron Oxide Catalysts and Their CO Conversion Efficiency
Full article
| Common |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Journal of Catalysis
ISSN: 0021-9517
, E-ISSN: 1090-2694
|
| Output data |
Year: 1988,
Volume: 112,
Number: 2,
Pages: 375-383
Pages count
: 9
DOI:
10.1016/0021-9517(88)90151-0
|
| Authors |
Kundu M.L.
1
,
Sengupta A.C.
1
,
Maiti G.C.
1
,
Sen B.
1
,
Ghosh S.K.
1
,
Kuznetsov V.I.
2
,
Kustova G.N.
2
,
Yurchenko E.N.
2
|
| Affiliations |
| 1 |
R&D Division, Projects & Development India Limited, Sindri-828 122, Dhanbad, India
|
| 2 |
lnstitute of Catalysis, Novosibirsk 630090, USSR
|
|
A systematic study has been conducted on the evolution of phases in chromia-promoted γ-Fe2O3 catalysts prepared under a wide range of conditions using different instrumental techniques, viz., DTA, XRD, TEM, IR, and Mössbauer spectroscopy. The structural parameters have been correlated with the reaction properties of the catalysts for the water gas shift reaction. It has been revealed that γ-Fe2O3 prepared by precipitation techniques has an imperfect spinel structure. In the wet mixing method of preparation of the catalyst, the interaction between γ-Fe2O3 and Cr2O3 is found to be insignificant, while for the coprecipitated method, the interaction takes place by the incorporation of Cr3+ ions into the octahedral vacant sites of the γ-Fe2O3 lattice where chromia concentration remains below 15%, above which the crystallization of the mixed phase is hindered and the activity of the catalyst tends to decrease. The reverse coprecipitation technique with a chromia concentration of nearly 10% is found to be most effective for imparting higher CO conversion activity.