The Influence of Support on the Activity of Monolayer Vanadia-Titania Catalysts for Selective Catalytic Reduction of NO with Ammonia

Marshneva, V. I.; Slavinskaya, Elena M.; Kalinkina, O. V.; Одегова, Г. В.; Мороз, Э. М.; Лаврова, Г. В.; Саланов, А. Н.

doi:10.1006/jcat.1995.1201

Cited by 58 publications

(28 citation statements)

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“…The values of the parameter estimates for both the binary and the ternary sample are reported in Table 2. An activation energy for the SCR reaction close to 15 kcal/mol has been estimated for both catalysts, in agreement with values in the literature (Wong and Nobe, 1984;Marshneva et al, 1995). It is worth emphasizing that the model satisfactorily accounts for the observed transient behaviors of the SCR reaction by simply superimposing the kinetics of the SCR reaction on the NH, adsorption-desorption kinetics, independently determined from the ammonia adsorption-desorption experiments performed in the absence of NO (Figures 2 and 3).…”

Section: Transient Kinetics Of Scr Of No By Nhsupporting

confidence: 86%

Dynamics of the SCR‐DeNO_x reaction by the transient‐response method

et al. 1997

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Section: Transient Kinetics Of Scr Of No By Nhsupporting

confidence: 86%

Dynamics of the SCR‐DeNO_x reaction by the transient‐response method

et al. 1997

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“…A related technique is chemical vapor deposition (CVD), which makes use of a volatile inorganic or organo-metallic compound that is deposited at the surface of a support oxide by reaction with the support hydroxyl groups. Interesting vanadium precursor compounds for this preparation method are VCl 4 and VOCl 3 , and their interaction with SiO 2 , TiO 2 and Al 2 O 3 has been studied in detail [154][155][156][157]. A similar synthesis method is atomic layer deposition (ALD) and series of V/SiO 2 and V/Al 2 O 3 catalysts were prepared according to this gas phase preparation technique [158].…”

Section: Preparation Methods Of Supported Vanadium Oxide Catalystsmentioning

confidence: 99%

Chemistry, spectroscopy and the role of supported vanadium oxides in heterogeneous catalysis

2003

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Supported vanadium oxide catalysts are active in a wide range of applications. In this review, an overview is given of the current knowledge available about vanadium oxide-based catalysts. The review starts with the importance of vanadium in heterogeneous catalysis, a discussion of the molecular structure of vanadium in water and in the solid state and an overview of the spectroscopic techniques enabling to study the chemistry of supported vanadium oxides. In the second part, it will be shown that advanced spectroscopic tools can be used to obtain detailed information about the coordination environment and oxidation state of vanadium oxides during each stage of the life-span of a heterogeneous catalyst. Three topics will be discussed: (1) the molecular structure of supported vanadium oxide catalysts under hydrated, dehydrated and reduced conditions, including the parameters, which influence the molecular structures formed at the surface of the support oxide; (2) elucidation of the active surface vanadium oxide during the oxidation of methanol to formaldehyde, the reaction mechanism and the vanadium oxide-support effect; and (3) deactivation of fluid catalytic cracking (FCC) catalysts by migration of vanadium oxides and the development of a method preventing the structural breakdown of zeolites by trapping the mobile vanadium oxides in an aluminum oxide coating.

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“…Nonetheless, because exhaust gases contain oxygen, and oxygen is involved in the SCR chemistry, a relevant reaction model should reflect oxygen participation: it is generally agreed in fact that oxygen is needed for reoxidation of the catalyst according to a Mars–van Krevelen or redox‐type mechanism 5. Moreover, it is also agreed that at low temperature the catalyst reoxidation by gas‐phase oxygen is the rate‐determining step of the overall reaction14, 24, 25: for example, Marshneva et al26 found that over their V‐based catalysts the activation energy of the SCR reaction was equal to the activation energy of vanadia reoxidation. Surprisingly, however, only a limited number of SCR rate equations have been proposed so far that contain an O 2 dependency derived according to a redox mechanism 5.…”

Section: Introductionmentioning

confidence: 99%