Study of FePO{sub 4} catalyst
- Bhabha Atomic Research Center, Bombay (India)
FePO{sub 4} catalyst with and without Pd impregnation has been prepared and studied for its temperature induced crystallization and identification of the phases formed during hydrogen reduction using {sup 57}Fe Moessbauer and XRD techniques. Amorphous FePO{sub 4} transforms to a hexagonal form at {approx}875 K. The reduction of amorphous FePO{sub 4} takes place at {approx}575 K and leads to the formation of Fe{sub 2}P{sub 2}O{sub 7}. The presence of palladium metal over ferric phosphate facilitates the reduction. Unlike amorphous FePO{sub 4}, reduction of crystalline FePO{sub 4} takes place via the formation of an intermediate phase having {delta} = 1.15 mm/sec and {Delta}Eq = 4.39 mm/sec. An ammonia adsorption-desorption study of FePO{sub 4} catalyst reveals that both Bronsted and Lewis acid sites are present. The catalyst loses its Bronsted acid sites upon calcination at {approx}875 K. During oxidative dehydrogenation of isobutyric acid to methacrylic acid, the amorphous FePO{sub 4} catalyst is converted to Fe{sub 7}(PO{sub 4}){sub 6} and Pd metal facilitates this conversion.
- OSTI ID:
- 508659
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 111; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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