Sulfidation of alumina-supported iron and iron-molybdenum oxide catalysts

Ramselaar, W. L. T. M.; Crajé, M.W.J.; Hadders, R.H.; Gerkema, E.; Beer, V.H.J. de; Kraan, A.M. van der

doi:10.1016/s0166-9834(00)81589-4

Cited by 22 publications

(11 citation statements)

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“…The spectrum is a superposition of lines of four doublets. The first two doublets have lower IS values which is in agreement with previous studies of sulfidized Fe and Fe-Mo catalysts and could be attributed to the "Fe 1-x S" and "Fe-Mo-S" species [7,8]. The next two doublets (Db 3 and Db 4) are of lower intensity and belong to high-spin (HS) iron in oxidation state Fe 2+ .…”

Section: Resultssupporting

confidence: 90%

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Study of iron state in titania-supported FeMo catalysts of hydrodesulfurization

Kraleva

Paneva

Spojakina

et al. 2005

React Kinet Catal Lett

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Section: Resultssupporting

confidence: 90%

“…This ratio indicates that the size of iron particles is about 4 nm. Decrease in iron loading (from 5FePMo/Ti to 1FePMo/Ti) at constant phosphorus content points to an additional possibility for phosphorus to affect on the iron oxide particles size [8], which was due to more favorable Fe/P ratio. XPS results support the Fe-P bond formation.…”

Section: Resultsmentioning

confidence: 98%

Study of iron state in titania-supported FeMo catalysts of hydrodesulfurization

Kraleva

Paneva

Spojakina

et al. 2005

React Kinet Catal Lett

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“…After sulfidation at 473 K, the RAA became almost its original value. Such a decrease of the RAA during sulfidation at a rather low temperature had previously been observed [7], but not as strong as for the 57Fe:Ni(0.5)/C catalyst. Since it is necessary to understand all features observed in the M6ssbauer study for a thorough understanding of the structure of the catalyst, the behaviour of the RAA during the sulfidation of the 57Fe:Ni(0.5)/C catalyst is studied more carefully.…”

Section: Introductionsupporting

confidence: 55%

Behaviour of the resonant absorption area of a57Fe-doped Ni/C catalyst during sulfidation

et al. 1994

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“…The alumina-supported FeMo catalysts are less active in the HDS of thiophene than carbon-supported catalysts. The iron concentration has very strong impact on HDS activity of the iron-molybdenum-alumina catalysts [11].…”

Section: Introductionmentioning

confidence: 99%

Support effect on the properties of iron–molybdenum hydrodesulfurization catalysts

et al. 2006

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Two series of Mo and Fe containing catalysts have been prepared over alumina and titania supports using H 3 PMo 12 O 40 heteropolyacid (HPMo) and Fe salt of HPMo. Catalysts have been characterized by BET, SEM, IR, TPR, XPS methods and by their HDS activity in the reaction of thiophene conversion. The TiO 2 -supported catalysts with low Mo concentration (6 wt%) show higher HDS activity than the catalyst with 12 wt% Mo. Iron promoting effect (Fe/Mo $ 0.1) is observed with both, the aluminaand titania-supported catalysts. Iron supported over alumina increases Mo reducibility and decreases it on TiO 2 -supported catalysts. Compared to alumina-supported catalysts, the TiO 2 -supported catalysts show higher surface concentration of Mo 6+ and Mo 5+ in octahedral coordination -Mo(Oh). Iron increases the Mo(Oh) concentration even more. After sulfidation the Fe-containing catalysts show formation of different Mo valence states (Mo 4+ , Mo 5+ , Mo 6+ ), Fe-P, Mo-P and/or Fe-Mo-P bonds, which affect the HDS catalytic activity.

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Sulfidation of alumina-supported iron and iron-molybdenum oxide catalysts

Cited by 22 publications

References 21 publications

Study of iron state in titania-supported FeMo catalysts of hydrodesulfurization

Study of iron state in titania-supported FeMo catalysts of hydrodesulfurization

Behaviour of the resonant absorption area of a57Fe-doped Ni/C catalyst during sulfidation

Support effect on the properties of iron–molybdenum hydrodesulfurization catalysts

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