Effect of W on the acidity and redox performance of the Cu0.02Fe0.2W TiOx (a = 0.01, 0.02, 0.03) catalysts for NH3-SCR of NO

Ma, Shibo; Zhao, Xiaoyu; Li, Yushi; Zhang, Tianrui; Yuan, Fang; Niu, Xiaoyu; Zhu, Yujun

doi:10.1016/j.apcatb.2019.02.015

Cited by 132 publications

(34 citation statements)

References 70 publications

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“…Magnetic iron oxides doped with tungsten and cerium were also prepared as SCR catalysts [239]. In these materials, iron is mainly in the form of γ- [240]. A moderate amount of tungsten significantly improves stability and acid and redox properties, leading to superior performances for the SCR reaction, even in the presence of water and SO 2 (best formula: Cu 0.02 Fe 0.2 W 0.02 TiO 2 ).…”

Section: Iron-promoted Wo 3 Catalysts For Nh 3 -Scrmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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Section: Iron-promoted Wo 3 Catalysts For Nh 3 -Scrmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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“…These suggested that the nitrate species adsorbed on catalyst surface were active in the SCR reaction, which could react with NH 3 existed in air quickly for the redox reaction. As shown in Figure 8b, the stable absorbing peaks attributed to NH 3 species were formed over Fe/(SZr) catalyst after introduction of NH 3 and purging at 250 • C. (The peaks located at 1608 and 1300 cm −1 can be assigned to the symmetric and asymmetric stretching vibrational peaks of NH 3 species on Lewis surface acid sites [21,31,33]. The peak at 1430 cm −1 can be attributed to the symmetric stretching vibration of NH 4 + species bounded…”

Section: In Situ Drifts Studying Of the Nh 3 -Adsorption On Differentmentioning

confidence: 96%

“…For the Fe/(SZr) catalyst, the two peaks appeared at 530.1 and 529.7 eV. The banding energy at 530.1 eV was attributed to the surface-chemisorbed labile oxygen (denoted as O α ), and the 529.7 eV peak was corresponded to the lattice oxygen (denoted as O β ) [21]. However, three peaks located at 531.9, 530.7, and 530.1 eV could be observed on the S(Fe/Zr) catalyst, which demonstrated that there were three forms of oxygen on this catalyst.…”

Section: Xpsmentioning

confidence: 99%

“…Typically, the surface-chemisorbed labile oxygen played important roles in the SCR reaction. More the content of O α , the higher catalytic activity of catalysts because the surface oxygen (Oα) could promote the activation of NH 2 − formed by NH 3 due to the more efficient mobility of electrons than lattice oxygen [21]. Therefore, the Fe/(SZr) catalyst had superior redox activity.…”

Section: Xpsmentioning

confidence: 99%

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Investigation of Sulfated Iron-Based Catalysts with Different Sulfate Position for Selective Catalytic Reduction of NOx with NH3

Fan

Zhang²,

Liu

et al. 2020

Catalysts

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The Fe/(SZr) and S(Fe/Zr) sulfated iron-based catalysts, prepared by impregnation methods through changing the loading order of Fe2O3 and SO42− on ZrO2, were investigated on selective catalytic reduction (SCR) of NOx by ammonia. It was studied that the existent forms of Fe2O3 and SO42− on the surface of catalysts were affected by the loading order. The Fe/(SZr) catalyst surface had isolated Fe2O3 and SO42− species and followed both the L-H mechanism and the E-R mechanism, whereas the S(Fe/Zr) catalyst contained SO42− specie and sulfate only and mainly followed the E-R pathway. These factors affected the redox ability and NH3 adsorption, which might be key to the SCR reaction.

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“…As can be observed from Figure8c, two peaks related to binding energies of 710.7 eV and 713.4 eV were attributed to Fe 2+ and Fe 3+ , respectively. Besides, the satellite diffraction at 718.6 eV belonged to Fe 2+[26]. Furthermore, the peak area of Fe 2+ was obviously larger than that of Fe 3+ , suggesting that the adsorbed Fe mainly existed as Fe2+ .…”

mentioning

confidence: 96%

Effect of ZnSO4, MnSO4 and FeSO4 on the Partial Hydrogenation of Benzene over Nano Ru-Based Catalysts

Sun

Fan

Sun

et al. 2021

IJMS

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Nano Ru-based catalysts, including monometallic Ru and Ru-Zn nanoparticles, were synthesized via a precipitation method. The prepared catalysts were evaluated on partial hydrogenation of benzene towards cyclohexene generation, during which the effect of reaction modifiers, i.e., ZnSO4, MnSO4, and FeSO4, was investigated. The fresh and the spent catalysts were thoroughly characterized by XRD, TEM, SEM, XPS, XRF, and DFT studies. It was found that Zn2+ or Fe2+ could be adsorbed on the surface of a monometallic Ru catalyst, where a stabilized complex could be formed between the cations and the cyclohexene. This led to an enhancement of catalytic selectivity towards cyclohexene. Furthermore, electron transfer was observed from Zn2+ or Fe2+ to Ru, hindering the catalytic activity towards benzene hydrogenation. In comparison, very few Mn2+ cations were adsorbed on the Ru surface, for which no cyclohexene could be detected. On the other hand, for Ru-Zn catalyst, Zn existed as rodlike ZnO. The added ZnSO4 and FeSO4 could react with ZnO to generate (Zn(OH)2)5(ZnSO4)(H2O) and basic Fe sulfate, respectively. This further benefited the adsorption of Zn2+ or Fe2+, leading to the decrease of catalytic activity towards benzene conversion and the increase of selectivity towards cyclohexene synthesis. When 0.57 mol·L−1 of ZnSO4 was applied, the highest cyclohexene yield of 62.6% was achieved. When MnSO4 was used as a reaction modifier, H2SO4 could be generated in the slurry via its hydrolysis, which reacted with ZnO to form ZnSO4. The selectivity towards cyclohexene formation was then improved by the adsorbed Zn2+.

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Effect of W on the acidity and redox performance of the Cu0.02Fe0.2W TiOx (a = 0.01, 0.02, 0.03) catalysts for NH3-SCR of NO

Cited by 132 publications

References 70 publications

Tungsten-Based Catalysts for Environmental Applications

Tungsten-Based Catalysts for Environmental Applications

Investigation of Sulfated Iron-Based Catalysts with Different Sulfate Position for Selective Catalytic Reduction of NOx with NH3

Effect of ZnSO4, MnSO4 and FeSO4 on the Partial Hydrogenation of Benzene over Nano Ru-Based Catalysts

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