Structural and phase relations in nonstoichiometric ferrites with oxygen deficiencies

Aksel'rod, E. I.; Alapin, B. G.; Vishnevsky, I.I.; Sukharevsky, B. Ya.

doi:10.1016/s0022-3697(71)80056-2

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…Above 0.6 atomic percent, the ferrite decomposes to a spinel solid solution of Fe 3 O 4 in MgFe 2 O 4 and excess Mg 2? cations are precipitated as a separate MgO phase [14]. The unfavorable phase change of catalyst may also occur in the Zn-ferrite case and results in the segregation of ZnO or formation of defect sites in spinel structure.…”

Section: Catalyst Deactivationmentioning

confidence: 99%

Prevention of Catalyst Deactivation in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene over Zn-Ferrite Catalysts

et al. 2009

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An efficient method to enhance the catalytic properties of Zn-ferrite catalyst in the oxidative dehydrogenation of n-butene to 1,3-butadiene is proposed. The incorporation of phosphorous compound in Zn-ferrite is very effective to improve the catalytic activity as well as to maintain extremely long useful lives at high oxygen to n-butene ratio. It is found that the amount of phosphorous is critical and the presence of appropriate amount of phosphorous in catalyst may contribute the catalyst stabilization by which unfavorable reduction of Fe 3? sites to Fe 2? is effectively suppressed. This suggests that the oxygen mobility is maintained as high as the redox mechanism keeps constantly working. On the other hand, the effort to increase the population of mobile oxygen species by the introduction of external oxygen donor phase is found to be rather ineffective regardless of the external donor oxides used.

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Section: Catalyst Deactivationmentioning

confidence: 99%