Morphologie und Phasenunterschiede bei V2O5 und TiO2 in Mischoxidkatalysatoren — Ursachen und gegenseitige Beeinflussung

Backhaus, Karsten; Haase, R.; Illgen, U.; Jancke, K.; Richter‐Mendau, J.; Scheve, J.; Schulz, I.; Vetter, Jens

doi:10.1002/bbpc.19830870814

Cited by 11 publications

(1 citation statement)

References 10 publications

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“…In the absence of Mo03, by contrast, a number of coexistent vanadium oxides such as V6013, V204, V7013, etc., were produced by V206 in the presence of Ti02 as described by Backhaus et al (1983). The As203 reaction, which we investigated as the key factor influencing the phase composition in the wet-bottom furnace, causes the disappearance of the VgMogO^phase (Figures 3,5, and 6).…”

Section: Discussionmentioning

confidence: 99%

Effects of arsenic oxide (As2O3) on the phase composition of vanadium pentoxide-molybdenum trioxide-titanium dioxide (anatase) DeNOx catalysts

Hums¹,

Goebel²

1991

Ind. Eng. Chem. Res.

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Section: Discussionmentioning

confidence: 99%

Effects of arsenic oxide (As2O3) on the phase composition of vanadium pentoxide-molybdenum trioxide-titanium dioxide (anatase) DeNOx catalysts

Hums¹,

Goebel²

1991

Ind. Eng. Chem. Res.

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Festkörperelektrolytpotentiometrie an oxidischen Katalysatoren

Brück¹,

Brust²,

Lintz³

1995

Ber Bunsenges Phys Chem

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The oxygen activity in the solid determines the phase composition which should be stable in the case of oxygen transfer reactions at oxidic catalyst. Its value results from the rates of the oxygen uptake by the solid and the oxygen transfer to an acceptor in the gas phase, e.g. a hydrocarbon or ammonia. This oxygen activity in the catalyst can be determined under reaction conditions with the aid of a potentiometric method based on the application of solid ion conductors. In that case the catalyst is simultaneously one electrode of an electrochemical cell, the oxygen activity and the reaction rate being measured simultaneously. The method has been applied during the investigation of the reduction of nitrogen monoxide by ammonia on copper oxide and a typical SCR catalyst on the basis of vanadia‐titania. The reaction was studied in the domain 300 <ϑ/°C < 390 at reactant concentrations up to 4000 ppm, the oxygen content in the gas phase being varied between 0 and 10 Vol.%. The results demonstrate unambiguously a correlation between oxidation state of the catalyst and the reaction kinetics. The rate increasing influence of oxygen is accompanied by the transition of V4+ to V5+ in the case of the SCR catalyst. In the case of copper oxide catalyst the reduction rate of NO is decreased at increasing oxygen concentration at the transition to Cu2+. In addition the increased N2O formation could be observed. In spite of the high oxygen excess a quasiequilibrium of oxygen chemisorption can be excluded in any case.

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ChemInform Abstract: MORPHOLOGY AND PHASE DIFFERENCES OF VANADIUM(V) OXIDE AND TITANIUM(IV) OXIDE IN MIXED OXIDE CATALYSTS ‐ CAUSES AND MUTUAL INFLUENCE

Backhaus¹,

Haase²,

Illgen³

et al. 1983

Chemischer Informationsdienst

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Morphologie und Phasenunterschiede bei V₂O₅ und TiO₂ in Mischoxidkatalysatoren — Ursachen und gegenseitige Beeinflussung

Cited by 11 publications

References 10 publications

Effects of arsenic oxide (As2O3) on the phase composition of vanadium pentoxide-molybdenum trioxide-titanium dioxide (anatase) DeNOx catalysts

Effects of arsenic oxide (As2O3) on the phase composition of vanadium pentoxide-molybdenum trioxide-titanium dioxide (anatase) DeNOx catalysts

Festkörperelektrolytpotentiometrie an oxidischen Katalysatoren

ChemInform Abstract: MORPHOLOGY AND PHASE DIFFERENCES OF VANADIUM(V) OXIDE AND TITANIUM(IV) OXIDE IN MIXED OXIDE CATALYSTS ‐ CAUSES AND MUTUAL INFLUENCE

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