NH<sub>3</sub>-SCR of NO with novel active, supported vanadium-containing Keggin-type heteropolyacid catalysts

Bukowski, Anna; Schill, Leonhard; Nielsen, David; Mossin, Susanne; Riisager, Anders; Albert, Jakob

doi:10.1039/d0re00033g

Cited by 14 publications

(6 citation statements)

References 48 publications

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“…Clearly V3W3 is the most reducible material. This determination using EPR represents a quantitative lower bound for the reducibility of the catalyst and the results could be compared with e. g. H 2 −TPR results for the same material . The reducibility by EPR has been tested with an SCR‐relevant gas mixture, whereas the reducibility tested with hydrogen gas is a model experiment, which is far away from actual SCR conditions.…”

Section: Resultsmentioning

confidence: 99%

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

et al. 2020

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Suggested mechanisms for NH 3 À SCR on V 2 O 5 /TiO 2 based catalysts contain both oxidized and reduced vanadium species. The degree of reduction and the importance of the redox properties of the catalyst are however still widely discussed. Here we show the presence of significant amounts of oxidovanadium(IV), VO 2 + using electron paramagnetic resonance (EPR) spectroscopy of V 2 O 5 /TiO 2 and V 2 O 5 /WO 3 /TiO 2 under operando selective catalytic reduction (SCR) of NO with NH 3 in a fixed bed plug flow reactor operating at high space velocity: 420,000 h À 1. The V(IV) content at the completely oxidized and reduced states is also analyzed. It is found that a significant part of the vanadium is reduced to the EPR active species, VO 2 + at operando SCR conditions and even more when O 2 is removed from the SCR gas.

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Section: Resultsmentioning

confidence: 99%

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

et al. 2020

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“…Vanadia-based catalysts are attracting great interest in many industrially important processes, such as the production of sulfuric acid by SO 2 oxidation, selective oxidation of hydrocarbons, and NH 3 -SCR. , NH 3 -SCR of NO x over vanadia-based catalysts is a widely used strategy for controlling NO x emissions. − Vanadium species act as the active sites in the catalytic reaction. Therefore, it is important to investigate these species in depth, especially under reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Induced Active Vanadium Species Facilitate Excellent Performance in Low-Temperature Catalytic NO_x Abatement

et al. 2021

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Vanadia-based catalysts have been widely used for catalyzing various reactions, including their long-standing application in the deNO x process. It has been commonly considered that various vanadium species dispersed on supports with a large surface area act as the catalytically active sites. However, the role of crystalline V 2 O 5 in selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) remains unclear. In this study, a catalyst with low vanadia loading was synthesized, in which crystalline V 2 O 5 was deposited on a TiO 2 support that had been pretreated at a high temperature. Surprisingly, the catalyst, which had a large amount of crystalline V 2 O 5 , showed excellent lowtemperature NH 3 -SCR activity. For the first time, crystalline V 2 O 5 on low-vanadium-loading catalysts was found to be transformed to polymeric vanadyl species by the adsorption of NH 3 . The generated active polymeric vanadyl species played a crucial role in NH 3 -SCR, leading to remarkably enhanced catalytic performance at low temperatures. This new finding provides a fundamental understanding of the metal oxide-catalyzed chemical reaction and has important implications for the development and commercial applications of NH 3 -SCR catalysts.

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“…There are black spots on TS-1, indicating that HPMo enters and deposits in the three-dimensional pore structure of TS-1. [63][64][65] Fig. 7e and f show that after modification with HPMo-H 2 O 2 , similar to the HPMo-Nano-TS-1 catalyst, part of the regular shape of TS-1 agglomerates, and there are still black spots in the molecular sieve, indicating that HPMo can still be well dispersed in the molecular sieve.…”

Section: Characterization Of Samplesmentioning

confidence: 99%

Synthesis of a phosphomolybdic acid/nanocrystalline titanium silicalite-1 catalyst in the presence of hydrogen peroxide for effective adsorption-oxidative desulfurization

Wang

Tong

et al. 2022

New J. Chem.

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NH₃-SCR of NO with novel active, supported vanadium-containing Keggin-type heteropolyacid catalysts

Abstract: Supported vanadium-substituted Keggin polyoxometalates (POMs) were applied as catalysts for the selective catalytic reduction of NO using NH3 as reductant (NH3-SCR).

Cited by 14 publications

References 48 publications

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

Adsorption-Induced Active Vanadium Species Facilitate Excellent Performance in Low-Temperature Catalytic NO_x Abatement

Synthesis of a phosphomolybdic acid/nanocrystalline titanium silicalite-1 catalyst in the presence of hydrogen peroxide for effective adsorption-oxidative desulfurization

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NH3-SCR of NO with novel active, supported vanadium-containing Keggin-type heteropolyacid catalysts

Abstract: Supported vanadium-substituted Keggin polyoxometalates (POMs) were applied as catalysts for the selective catalytic reduction of NO using NH3 as reductant (NH3-SCR).

Cited by 14 publications

References 48 publications

Assessing the Importance of V(IV) During NH3−SCR Using Operando EPR Spectroscopy

Assessing the Importance of V(IV) During NH3−SCR Using Operando EPR Spectroscopy

Adsorption-Induced Active Vanadium Species Facilitate Excellent Performance in Low-Temperature Catalytic NOx Abatement

Synthesis of a phosphomolybdic acid/nanocrystalline titanium silicalite-1 catalyst in the presence of hydrogen peroxide for effective adsorption-oxidative desulfurization

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Resources

About

NH₃-SCR of NO with novel active, supported vanadium-containing Keggin-type heteropolyacid catalysts

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

Assessing the Importance of V(IV) During NH₃−SCR Using Operando EPR Spectroscopy

Adsorption-Induced Active Vanadium Species Facilitate Excellent Performance in Low-Temperature Catalytic NO_x Abatement