NDLI: Effect of calcination temperature on the physicochemical and catalytic properties of FeSO$_{4}$/SiO$

Content Provider	Springer Nature Link
Author	Shuvaeva, M. A. Delii, I. V. Mart’yav, O. N. Bayukov, O. A. Osetrov, E. I. Saraev, A. A. Kaichev, V. V. Sakaeva, N. S. Bukhtiyarova, G. A.
Copyright Year	2011
Abstract	The effect of calcination temperature on the state of the active component of iron-containing catalysts prepared by the impregnation of silica gel with a solution of FeSO$_{4}$ and on their catalytic properties in selective H$_{2}$S oxidation to sulfur was studied. With the use of thermal analysis, XPS, and Mössbauer spectroscopy, it was found that an X-ray amorphous iron-containing compound of complex composition was formed on the catalyst surface after thermal treatment in the temperature range of 400–500°C. This compound contained Fe$^{3+}$ cations in three nonequivalent positions characteristic of various oxy and hydroxy sulfates and oxide and sulfate groups as anions. Calcination at 600°C led to the almost complete removal of sulfate groups; as a result, the formation of an oxide structure came into play, and it was completed by the production of finely dispersed iron oxide in the ɛ-Fe$_{2}$O$_{3}$ modification (the average particle size of 3.2 nm) after treatment at 900°C. As the calcination temperature was increased from 500 to 700°C, an increase in the catalyst activity in hydrogen sulfide selective oxidation was observed because of a change in the state of the active component. A comparative study of the samples by temperature-programmed sulfidation made it possible to establish that an increase in the calcination temperature leads to an increase in the stability of the iron-containing catalysts to the action of a reaction atmosphere.
Starting Page	896
Ending Page	906
Page Count	11
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	52
Issue Number	6
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-11-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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