ISSN:
1572-879X
Keywords:
iron catalyst
;
titania
;
hydrogenation of CO2
;
Mössbauer
;
EXAFS
;
Raman
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Titania-supported iron oxide catalyst has been designed based on a geometric consideration. The catalyst prepared by reducing the precursor obtained from incipient wetness impregnation in H2 at proper temperature exhibits good activity (CO2 conversion 〉24%) and selectivity (〉60%) in the selective synthesis of hydrocarbons (C2–C5) from CO2 and H2. The catalytic activity has been found to vary with iron weight loadings in a “twin maxima” fashion and, also, to be affected by the reduction temperature. Mössbauer and EXAFS analyses suggest that the active phase is coordinatively unsaturated ferrous cations associated with α-Fe. Alternative arrangement of the two phases in a proper way is beneficial to relax the Fe-O bonds and results in the highest catalytic activity for the catalyst, but the formation of predominantly FeTiO3 phase finally makes the catalyst inactive.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00807184
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