Relationship between structures and activities of supported metal vanadates for the selective catalytic reduction of NO by NH3

Marberger, Adrian; Ferri, Davide; Elsener, Martin; Sagar, Amod; Artner, Christine; Schermanz, Karl; Kröcher, Oliver

doi:10.1016/j.apcatb.2017.06.061

Cited by 81 publications

(26 citation statements)

References 61 publications

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“…Therefore, some modifications have been investigated to overcome these defects. Adrian, M. et al [7] chose TiO 2 -WO 3 -SiO 2 as a catalyst support for optimization, using rare metal to inhibit the phase transition of titanium dioxide, to avoid high temperature sintering and surface area loss, and improve the structural strength of the support. At the same time, SiO 2 is beneficial to SO 2 resistance.…”

Section: Composition Of Vanadium Based Catalystmentioning

confidence: 99%

“…Below 25% indicates that the vanadium content is too low or the surface area is too high and the catalyst activity is low. With coverage of more than 50%, the stability of the catalyst and the conversion of NO x at high temperatures cannot be guaranteed [7,14]. The vanadium coverage of conventional catalysts is below the dispersion limit that monolayer 6–7 atom /nm 2 to avoid the crystalline V 2 O 5 [15].…”

Section: Composition Of Vanadium Based Catalystmentioning

confidence: 99%

“…As a modified element, it could facilitate the valence of vanadium species rapidly changing by a redox cycle of V 5+ + Ce 3+ ↔ V 4+ + Ce 4+ . There are experiments using CeVO 4 as a precursor loaded onto the support and compared with the performance of V 2 O 5 /TiO 2 [7,18]. It shows that the catalyst has a high catalytic activity and a wide temperature window with the best Ce content and a suitable calcination temperature (vanadate decomposition temperature).…”

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

“…Ce 4+ /Ce 3+ can form solid solutions with other oxides to increase the active sites. Meanwhile, Ce can effectively reduce the sintering tendency [7,42]. In addition, the activity distribution of V 2 O 5 /CeO 2 mixed oxides is somewhat complex.…”

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

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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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Section: Composition Of Vanadium Based Catalystmentioning

confidence: 99%

Section: Composition Of Vanadium Based Catalystmentioning

confidence: 99%

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhang

Chen

et al. 2018

Materials

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“…Subsequent, deposition on TiO 2 ÀWO 3 ÀSiO 2 underlined the difficulty to monitor properly preferential interactions with the formation of Fe 2 WO 6 . Marberger et al [80] also provided useful information by studying the thermal stability of CeVO 4 , FeVO 4 and ErVO 4 catalysts on SiO 2 ÀWO 3 ÀTiO 2 . These authors found that less stable FeVO 4 decomposes into VO x and Fe 2 O 3 .…”

Section: Thermally Resistant Bulk V-scr Systemsmentioning

confidence: 99%

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Granger

Siaka

Umbarkar

2018

The Chemical Record

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This paper reports a short review on the impact of poisoning effects and thermal aging on the reactivity of surface vanadate species on benchmark V2O5−WO3/TiO2 Selective‐Catalytic‐Reduction catalysts. A renewed interest of this SCR technology is related to its diversification notably as after‐treatment systems to treat the exhaust from Diesel engines with higher running temperature especially when SCR catalysts are coated on Diesel Particulates Filters. Particular attention is also paid to poisoning effects in conjunction with the progressive replacement of fossil fuels by bio‐fuels containing alkaline contaminants which drastically deactivate the catalyst through neutralization of strong acid sites. Most of the investigations show that better insight into the mechanisms of poisoning and aging processes is needed especially to understand the relative sensibility of various vanadate species. This could provide original guidelines to catalyst preparation and or the developments of more stable bulk systems as exemplified.

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Isolated Platinum Atoms Stabilized by Amorphous Tungstenic Acid: Metal–Support Interaction for Synergistic Oxygen Activation

et al. 2018

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Oxygen activation plays ac rucial role in many important chemical reactions such as oxidation of organic compounds and oxygen reduction. Ford eveloping highly active materials for oxygen activation, herein, we report an atomically dispersed Pt on WO 3 nanoplates stabilized by in situ formed amorphous H 2 WO 4 out-layer and the mechanism for activating molecular oxygen. Experimental and theoretical studies demonstrate that the isolated Pt atoms coordinated with oxygen atoms from [WO 6 ]and water of H 2 WO 4 ,consequently leading to optimizeds urface electronic configuration and strong metal-support interaction (SMSI). In exemplified reactions of butanone oxidation sensing and oxygen reduction, the atomic Pt/WO 3 hybrid exhibits superior activity than those of Pt nanoclusters/WO 3 and bare WO 3 as well as enhanced long-term durability.T his work will provide insight into the origin of activity and stability for atomically dispersed materials,t hus promoting the development of highly efficient and durable single atom-based catalysts.

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Relationship between structures and activities of supported metal vanadates for the selective catalytic reduction of NO by NH3

Cited by 81 publications

References 61 publications

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

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

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Isolated Platinum Atoms Stabilized by Amorphous Tungstenic Acid: Metal–Support Interaction for Synergistic Oxygen Activation

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