Study on the Reaction Mechanism for Soot Oxidation Over TiO2 or ZrO2-supported Vanadium Oxide Catalysts by Means of In-situ UV-Raman

Liu, Jian; Zhang, Zhao; Liang, Peng; Chen, Xu; Duan, Aijun; Jiang, Guiyuan; Lin, Wenliang; Wachs, Israel E.

doi:10.1007/s10562-007-9267-6

Cited by 23 publications

(17 citation statements)

References 17 publications

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“…Moreover, the commercial Peugeot‐Citröen Societé d'Automobiles system for diesel particulate abatement utilizes Ce as a fuel additive, which ultimately results in excellent contact between in situ ‐formed CeO 2 and soot particles on the particulate filter and lowers the ignition temperature of soot oxidation . It has also been well known that ceria‐based catalysts demonstrated higher activity in soot oxidation after doping with other elements, such as La and Zr …”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

Yin¹,

Davis²,

Mahamulkar³

et al. 2016

AIChE Journal

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A series of cerium‐zirconium mixed oxides was prepared and evaluated in the catalytic oxidation of solid coke with 10 vol % O2 in He at 673 K using a thermogravimetric analyzer. The measured first order rate constant for coke oxidation was proportional to the catalyst loading when the mass ratio of catalyst to coke was low, which enabled the calculation of a surface area specific reaction rate. The validity of the normalization method was confirmed by performing CO oxidation over the cerium‐zirconium mixed oxides in a fixed bed reactor at 573 K. Although there was no correlation between the coke oxidation rate and the oxygen storage capacity or the reducibility of the catalysts, there was an excellent correlation to the CO oxidation rate. Kinetic studies of both coke and CO oxidation suggested an important role of surface lattice oxygen from the catalyst in the two reactions. © 2016 American Institute of Chemical Engineers AIChE J, 63: 725–738, 2017

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Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

Yin¹,

Davis²,

Mahamulkar³

et al. 2016

AIChE Journal

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“…The thermal gravimetric experiments of soot in the presence of the catalyst V2O5 (V0, V5, V10, V20, V40) were performed at different heating rates (10,15,20,25, 30 o C/min).…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Vanadium-based catalysts have been widely employed in the field of catalysts, including the oxidative dehydrogenation of propane, selective oxidation of alcohols, oxidative degradation of volatile organic compounds (VOCs) and selective catalytic reduction (SCR) of nitrogen oxides [4][5][6][7]. In recent years, vanadium-based catalysts have been considered as the most potential one for regeneration of DPF [1,[8][9][10]. This is mainly attributed to its unique properties.…”

Section: Introductionmentioning

confidence: 99%

“…The active component V2O5 on the carrier surface has high mobility, which can improve the loose contact state of particulate-catalyst mixtures in DPF and promote the catalytic efficiency [1,8,9]. Liu et al [10] found that the combination of V2O5 and TiO2 (V2O5) not only facilitate the soot oxidation directly, but also oxidize NO to NO2 in automobile exhaust like noble metal catalysts. Due to its strong oxidizing ability, the soot oxidation can be accelerated by NO2.…”

Section: Introductionmentioning

confidence: 99%

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Phy-chemical Attributes of Nano-scale V2O5/TiO2 Catalyst and Its’ Effect on Soot Oxidation

Mei

Zhu

et al. 2016

Bull. Chem. React. Eng. Catal.

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The V2O5 catalysts which supported on nano-scale TiO2 with variation of vanadium contents (5%, 10%, 20% and 40%) were prepared by an incipient-wetness impregnation method. The phase structures of nano-scale V2O5/TiO2 catalysts with different loading rates were characterized by Scanning electron microscope (SEM), X-Ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectra. The oxidation activities of catalysts over diesel soot were performed in a themogravimetric analysis (TGA) system. The kinetics of the catalytic oxidation process were analyzed based on Flynn-Wall-Ozawa method. The characterization results showed that the phase structure of V2O5 supported on TiO2 depends heavily on the vanadium contents, which will put great effects on the catalytic performances for soot oxidation. At a low vanadium loading rates (V5-V20), active species exist as monomers and polymeric states. At a high loading rate (V40), the crystalline bulk V2O5 covers the surface of TiO2. The formed crystal structure occupied the active sites and led a decreasing in the catalytic effect. By comparing the characteristics temperatures of soot oxidation over V2O5 catalysts, the catalytic activities of catalysts with different loading rates for soot oxidation can be ranked as: V5 < V10 < V40 < V20. Via pyrolysis kinetics analysis, it is revealed that the activation energy of soot oxidation is minimum when the vanadium loading rates is 20%, which is fit well with the TG experimental results. The consistency of pyrolysis kinetics and TG experimental results confirm that the best activity catalyst is V20 in discussed catalysts of this paper, which is nearest to the monolayer dispersion saturated state of V2O5/TiO2 catalyst. Moreover, it convincingly demonstrate the obvious threshold effect in V2O5 catalysts.

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“…However, the soot particulate matter (PM) emitted from diesel engine is a serious contamination for human beings, as it can penetrate into the lung and cause severe bronchial troubles [5][6]. With the regulations for pollutant emissions becoming stricter, it becomes very important and urgent to develop the after-treatment technologies for PM abatement [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic activity of K4Zr5O12 for the oxidation of soot from vehicle engine emissions

Wang

Sohn

Park

et al. 2010

Journal of Industrial and Engineering Chemistry

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Study on the Reaction Mechanism for Soot Oxidation Over TiO2 or ZrO2-supported Vanadium Oxide Catalysts by Means of In-situ UV-Raman

Cited by 23 publications

References 17 publications

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

Phy-chemical Attributes of Nano-scale V2O5/TiO2 Catalyst and Its’ Effect on Soot Oxidation

Preparation and catalytic activity of K4Zr5O12 for the oxidation of soot from vehicle engine emissions

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