Combined catalytic systems for enhanced low-temperature NO  abatement

Stakheev, A. Yu.; Mytareva, Alina I.; Bokarev, Dmitriy A.; Баева, Г. Н.; Криворученко, Д. С.; Kustov, Arkadii; Grill, Marie; Thøgersen, Joakim R.

doi:10.1016/j.cattod.2015.05.023

Cited by 28 publications

(20 citation statements)

References 22 publications

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“…Cr doping promotes the formation of V 5+ (VOPO 4 ) and the oxidation of NO to NO 2 , which is favorable for lowtemperature SCR activity (Volta, 2001;Taufiq-Yap et al, 2010). An appropriate amount of redox-coupled V 5+ and V 4+ also promotes the catalytic activity of the VPO catalyst (Centi, 1993;Stakheev et al, 2015;Ren et al, 2016;Salazar et al, 2016). Figure 11D shows the Cr 2p XPS spectra of 0.1VP(0.2)O-Cr(0.01)-PEG(1×10 −4 )/Ti.…”

Section: Xps Analysismentioning

confidence: 98%

“…Much effort has focused on developing catalysts for lowtemperature denitration. Different metal oxides, supporters, and polymetallic catalysts have been investigated for low-temperature denitration (Andreoli et al, 2015;Stakheev et al, 2015;Cha et al, 2016;Chen et al, 2016;Wang et al, 2016). The denitration efficiency of some of these catalysts could reach more than 95% at temperature of 150 • C. However, catalyst activities were generally inhibited by SO 2 and water vapor because of deposition of (NH 4 ) 2 SO 4 and metal sulfates on the surface of catalyst (Cha et al, 2016;Wang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effect of SO2 and H2O on VPO-Cr-PEG/TiO2 for the Low-Temperature SCR de-NOx

et al. 2019

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A catalyst 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti for low-temperature SCR de-NO x was developed and the effects of SO 2 and water vapor on its catalytic activity were investigated. Cr doping increases the molar ratio of V 5+ to V 4+ on the VPO catalyst, which promote oxidation of NO to NO 2 and catalytic activity of the VPO catalyst. An appropriate amount of redox-coupled V 5+ /V 4+ also promotes catalytic activity of the VPO catalyst. The denitration efficiency over 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti was above 98% at 150-350 • C. Cr doping also promotes the generation of Lewis acid around V 5+ center and Brønsted acid (P-OH) on the VPO catalysts. The strong surface acidity of 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti could restrain the adsorption of and oxidation of SO 2. Characterization (FT-IR, TG) results indicate that nearly no sulfate was deposited on the surface of 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti after activity test. The competitive adsorption of water molecules and nitric oxide on the catalyst surface decreases the catalytic activity of the VPO catalyst. The addition of Cr and PEG could increase the surface area and the exposure of active site of VPO catalyst, which also increase the unoccupied active sites of VPO catalysts in the presence of water vapor. The catalyst 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti for low-temperature SCR de-NO x shows high catalytic activity and exhibits high resistance to SO 2 and water vapor.

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Section: Xps Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of SO2 and H2O on VPO-Cr-PEG/TiO2 for the Low-Temperature SCR de-NOx

et al. 2019

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“…Then, in order to improve the catalytic activity over a wide temperature range is necessary to establish the optimal proportion of active species, in mono and multi-metallic catalysts. In several review works, for low-temperature SCR-deNO x catalysts ( Guan et al, 2014 ; Stakheev et al, 2015 ; Gao, 2020 ; Gramigni et al, 2020 ), the authors concluded that zeolites with small and large pores such as; BEA, MFI, CHA, LTA, etc., with Fe and Cu mainly, have shown the best performance in the operating range less than 300°C.…”

Section: Catalytic Processes With Transition Metals On Zeolitesmentioning

confidence: 99%

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

et al. 2021

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This article reviews the current state and development of thermal catalytic processes using transition metals (TM) supported on zeolites (TM/Z), as well as the contribution of theoretical studies to understand the details of the catalytic processes. Structural features inherent to zeolites, and their corresponding properties such as ion exchange capacity, stable and very regular microporosity, the ability to create additional mesoporosity, as well as the potential chemical modification of their properties by isomorphic substitution of tetrahedral atoms in the crystal framework, make them unique catalyst carriers. New methods that modify zeolites, including sequential ion exchange, multiple isomorphic substitution, and the creation of hierarchically porous structures both during synthesis and in subsequent stages of post-synthetic processing, continue to be discovered. TM/Z catalysts can be applied to new processes such as CO2 capture/conversion, methane activation/conversion, selective catalytic NOx reduction (SCR-deNOx), catalytic depolymerization, biomass conversion and H2 production/storage.

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“…Stakheev et al [2,3] have recently demonstrated a principle which may become productive in this search. They showed that physical mixtures of catalysts active in NO oxidation and in SCR can produce strong synergetic effects in standard SCR (1), with conversions far exceeding those obtained with the individual components in a temperature range of practical relevance.…”

Section: Introductionmentioning

confidence: 97%

“…They showed that physical mixtures of catalysts active in NO oxidation and in SCR can produce strong synergetic effects in standard SCR (1), with conversions far exceeding those obtained with the individual components in a temperature range of practical relevance. This was ascribed to a mechanism according to which standard SCR proceeds as a sequence of NO oxidation (2) and fast SCR (3), which is accelerated by superior NO 2 formation rates over the oxidation catalyst.…”

Section: Introductionmentioning

confidence: 99%