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Vanadia, vanadia-titania, and vanadia-titania-silica gels: Structural genesis and catalytic behavior in the reduction of nitric oxide with ammonia
type: Information Content Entity
has publication venue: Journal of Catalysis
most specific type: Article
abstract: Metal oxide xerogels of pure vanadia, vanadia-titania, and vanadia-titania-silica were prepared by the hydrolysis of vanadium, titanium, and silicon alkoxides. The structural and chemical transformations of the gels occurring during thermal treatment under oxidizing and inert gas atmosphere were studied using thermoanalytical methods (TG, DTA) combined with mass spectroscopy, X-ray diffraction, and electron microscopy. Crystallization of the amorphous vanadia was found to be considerably retarded in the mixed gels compared to the pure vanadia gel. The mixed gels remain amorphous at 520 K, whereas crystallization already occurs in the pure vanadia gel at this temperature. All mixed gel phases separate after stabilization at 870 K, with the formation of V2O5 platelets and globular TiO2 (anatase) particles. No other phases were detected by X-ray diffraction at this temperature. Addition of silica sol increases the overall surface area of the gel catalysts. This, however, does not increase the dispersion of vanadia in the amorphous matrix or stabilize it sufficiently to prevent crystallization under oxidizing conditions. Heat treatment of the gels at temperatures close to the melting point of vanadia results in rapid transformation of anatase to rutile. The stability and catalytic activity of the gels for the selective catalytic reduction of NO with NH3 (SCR) were studied following thermal treatments under in situ and oxidizing (7%25 O2) atmosphere. Low temperature SCR testing (T ≤ 520 K) showed that the same kinetic behavior typical of titania-supported vanadia exists in all gels, with activity behavior being a function of gel composition and dispersion. © 1992.
type: Continuant
origen: scopus
page start: 75
doi: 10.1016/0021-9517(92)90211-Y
e iscopus: 2-s2.0-0003043295
type: Thing
issue: 1
related by: authorship 1333
type: Entity
date time value: article date 314
page end: 86
type: Article
most specific type: Document
type: Generically Dependent Continuant
crisid: 314
has funding vehicle: Kommission zur Förderung der wissenschaftlichen Forschung, KWF
type: Document
estado: published
volume: 134
related by: authorship 1331
related by: authorship 1332

Journal of Catalysis
publication venue for: Vanadia, vanadia-titania, and vanadia-titania-silica gels: Structural genesis and catalytic behavior in the reduction of nitric oxide with ammonia
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type: Journal
type: Continuant
type: Generically Dependent Continuant
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type: Periodical
type: Document

Continuant
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individual
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date: 2026-08-26T03:16:20
publisher: vivo
type: Document
label: RDF description of Vanadia, vanadia-titania, and vanadia-titania-silica gels: Structural genesis and catalytic behavior in the reduction of nitric oxide with ammonia - http://orbis.uaslp.mx/vivo/individual/scopus313

Article
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Kommission zur Förderung der wissenschaftlichen Forschung, KWF
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type: BFO_0000020
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type: Thing
type: Grant
type: Continuant
funding vehicle for: Vanadia, vanadia-titania, and vanadia-titania-silica gels: Structural genesis and catalytic behavior in the reduction of nitric oxide with ammonia

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