Nature of the vanadia?ceria interface in V5+/CeO2 catalysts and its relevance for the solid-state reaction toward CeVO4 and catalytic properties

Martı́nez-Huerta, M.V.

doi:10.1016/j.jcat.2004.04.005

Cited by 147 publications

(49 citation statements)

References 34 publications

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“…This represents the first direct structure-spectroscopy relation for those materials, and disagrees with previous assumptions on those relations [20][21][22][23][24][25][26]. The photoelectron spectra recorded for the same set of preparations exhibits further interesting structure-property relations: The V2p spectra of the vanadia deposits reveal an oxidation state of V 5+ [27], compatible with a fourfold coordinated vanadyl containing species and indicating that the support is actively involved in determining the electronic structure through redox processes.…”

Section: Resultscontrasting

confidence: 86%

Model Studies on Heterogeneous Catalysts at the Atomic Scale

2014

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Thin single crystalline oxide films comprise perfect supports to grow nanoparticles of metals and other catalytically relevant materials. The model systems thus created can be thoroughly investigated with respect to structure and/or chemical activity applying both, the techniques of surface science under ultrahigh vacuum conditions as well as the traditional techniques applied in catalysis to study chemical kinetics under ambient conditions. We discuss here in particular the oxidation of methanol to formaldehyde on ceria supported vanadia nanoclusters as well as the effect of transition-metal dopants in single crystalline oxides, such as CaO, on the activation of molecular oxygen

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Section: Resultscontrasting

confidence: 86%

Model Studies on Heterogeneous Catalysts at the Atomic Scale

2014

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“…The theoretical value for monolayer coverage of dehydrated VO x /TiO 2 catalysts is 7.9 atom/nm 2 [29]. Due to stronger interactions between vanadium and ceria, vanadium oxide species disperse on ceria up to 9 V atom/nm 2 of support determined by Raman Spectroscopy [31]. Vanadia reacts with cerium oxide to form CeVO 4 phase, so two types of vanadium species (VO x and CeVO 4 ) are dispersed on the surface of cerium dioxide.…”

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Zhang

Chen

et al. 2018

Materials

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Selective catalytic reduction of NOx with NH3 is one of the most widely used technologies in denitration. Vanadium-based catalysts have been extensively studied for the deNOx process. V2O5/WO3(MoO3)TiO2 as a commercial catalyst has excellent catalytic activity in the medium temperature range. However, it has usually faced several problems in practical industrial applications, including narrow windows of operation temperatures, and the deactivation of catalysts. The modification of vanadium-based catalysts will be the focus in future research. In this paper, the chemical composition of vanadium-based catalysts, catalytic mechanism, the broadening of the temperature range, and the improvement of erosion resistance are reviewed. Furthermore, the effects of four major systems of copper, iron, cerium and manganese on the modification of vanadium-based catalysts are introduced and analyzed. It is worth noting that the addition of modified elements as promoters has greatly improved the catalytic performance. They can enhance the surface acidity, which leads to the increasing adsorption capacity of NH3. Surface defects and oxygen vacancies have also been increased, resulting in more active sites. Finally, the future development of vanadium-based catalysts for denitration is prospected. It is indicated that the main purpose for the research of vanadium-based modification will help to obtain safe, environmentally friendly, efficient, and economical catalysts.

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“…11 Vanadium-based oxides have been studied for catalytic conversion of hydrocarbons into H 2 and hydrocarbon commodities at temperatures lower than those of typical thermochemical processes. [12][13][14][15][16] For instance, partial oxidation of methane to formaldehyde has been reported at temperatures 500-640 C with insights into the mechanism of sequential oxidation of methane. [17][18][19] Recently, Fu et al reported thermodynamic analysis of vanadia redox materials for thermochemical ammonia production with high fuel selectivity and a high solar-to-fuel efficiency of up to 38.1% is achieved.…”

Section: Introductionmentioning

confidence: 99%

Cyclic oxygen exchange capacity of Ce-doped V₂O₅ materials for syngas production via high-temperature thermochemical-looping reforming of methane

2021

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Nature of the vanadia?ceria interface in V5+/CeO2 catalysts and its relevance for the solid-state reaction toward CeVO4 and catalytic properties

Cited by 147 publications

References 34 publications

Model Studies on Heterogeneous Catalysts at the Atomic Scale

Model Studies on Heterogeneous Catalysts at the Atomic Scale

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Cyclic oxygen exchange capacity of Ce-doped V₂O₅ materials for syngas production via high-temperature thermochemical-looping reforming of methane

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Nature of the vanadia?ceria interface in V5+/CeO2 catalysts and its relevance for the solid-state reaction toward CeVO4 and catalytic properties

Cited by 147 publications

References 34 publications

Model Studies on Heterogeneous Catalysts at the Atomic Scale

Model Studies on Heterogeneous Catalysts at the Atomic Scale

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Cyclic oxygen exchange capacity of Ce-doped V2O5 materials for syngas production via high-temperature thermochemical-looping reforming of methane

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Cyclic oxygen exchange capacity of Ce-doped V₂O₅ materials for syngas production via high-temperature thermochemical-looping reforming of methane