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Title: Investigation of Cr3+ substituted γ-Fe2O3 catalyst in its active form
Authors: Sengupta, A C
Kundu, M L
Maiti, G C
Sen, B
Ghosh, S K
Banerjee, P
Ganguli, S
Bhattacharya, M
Issue Date: Dec-1992
Publisher: NISCAIR-CSIR, India
Abstract: The Cr3+ ion substituted γ-Fe2O3 catalysts after reduction in their active states for water gas shift reaction, prepared by three different routes have been investigated using TG, XRD, IR and Mossbauer techniques. The TG and XRD results indicate that Cr3+ could be substituted in the magnetite lattice and the IR and Mossbauer investigations reveal that Cr3+ gets included in the octahedral sites of γ-Fe2O3. The inclusion of Cr3+ produces ultrafine particles indicative of lattice instability which depends on the method of preparation. Ultrafine particles have been registered through the average crystallite size measurement by XRD and the super paramagnetic doublet in Mossbauer spectra. On the basis of correlation between relative abundance of ultrafine particles and the concentration of Cr3+ ions, the criteria for the best catalytic function have been suggested invoking ordering of Cr3+ ions/vacancies and the electron hopping between Fe2+ and Fe3+ in the magnetite lattice.
Page(s): 909-914
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.31A(12) [December 1992]

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