The influence on SCR activity of the atomic structure of V2O5/TiO2 catalysts prepared by a mechanochemical method

Kwon, Dong Wook; Park, Kwang Hee; Hong, Sung Chang

doi:10.1016/j.apcata.2012.09.050

Cited by 70 publications

(23 citation statements)

References 41 publications

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“…The peak at 516.9 eV was assigned to V 5+ 2p 3/2 and the 516.2 eV peak was V 4+ 2p 3/2 ; no V 3+ Downloaded by [New York University] peak was found. The XPS spectra show that the V 4+ /V 5+ ratio of V/Ti was 0.47, which increased to 1.62 of 10Cu-V/Ti, as reported previously (Kwon et al, 2013), the (V 4+ + V 3+ )/V 5+ ratio (here is V 4+ /V 5+ ) and NO x conversion have a proportional relationship. Analyzed with the Ti 2p and Cu 2p spectrum, we can conclude that V 2 O 5 interacted with TiO 2 by Cu species, and this interaction has led to an increase in V 4+ compared with direct interaction with TiO 2 .…”

Section: Xpssupporting

confidence: 72%

A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

Zhong

Zhang

et al. 2014

Combustion Science and Technology

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A series of CuO-V 2 O 5 /TiO 2 catalysts with different Cu contents were prepared by wet impregnation method and used in selective catalytic reduction of NO with NH 3 . The aim of this design was to improve the low-temperature selective catalytic reduction (SCR) performance and broaden the temperature window compared to V 2 O 5 /TiO 2 and CuO/TiO 2 . It was found that the NO conversion over Cu-V/Ti was greatly improved with V 2 O 5 /TiO 2 and CuO/TiO 2 . The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2 -TPR), temperature programmed desorption of ammonia or nitric oxide (NH 3 -TPD and NO-TPD). The results indicated that copper species had a good interaction with TiO 2 , vanadium species interacted with TiO 2 by copper species, thereby generating more V 4+ . This had led to the increasing of chemisorb oxygen, better reduction property, more surface acid sites, and improvement of NH 3 and NO adsorption capacity, all of these resulting in better NH 3 -SCR performance of 10Cu-V/Ti catalysts. Furthermore, the catalyst showed a good H 2 O and SO 2 resistance at activation temperature.

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Section: Xpssupporting

confidence: 72%

A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

Zhong

Zhang

et al. 2014

Combustion Science and Technology

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“…It was interesting that the amount of H 2 consumption over DP2 was the largest, which was not consistent with the order of NO conversion of these three catalysts. Kwon et al thought that H 2 ‐consumption of each catalyst did not have direct correlation with NO x conversion. The H 2 ‐TPR results reported by Gao et al showed that the most active catalyst CeTi (SG), prepared by sol–gel method, obtained the smallest amount of H 2 consumption.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of SCR performance of monolithic Mn–Ce/Al₂O₃/cordierite catalysts by using modified deposition precipitation method

Quan

et al. 2019

Asia-Pacific J Chem Eng

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Mn-Ce catalysts have been widely studied for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 ; however, most of them are powdery or granular. Monolithic catalysts which are more suitable for practical industrial applications still need detailed exploration. In this research, a series of monolithic Mn-Ce/Al 2 O 3 /cordierite catalysts were prepared by impregnation (IMP), deposition precipitation (DP), and modified deposition precipitation (MDP) methods. The catalyst MDP3 which depositing alumina and MnO x -CeO x simultaneously for three times by MDP method showed the best activity, and it performed much better at low temperature than the catalysts prepared by IMP and DP methods. MDP3 also showed the best resistance to H 2 O and SO 2 . It was thought that Mn-Al and Mn-Al-Ce clusters formed in the preparation of MDP3 and enhanced the interaction between the mixed oxides, as indicated by the characterization results. MDP3 prepared by MDP method showed the largest BET surface area, good redox capabilities, and the highest atomic ratios of Ce 3+ and O b . Hence, MDP was proved to be an effective method to enhance the interaction between the washcoat and the active phase, which resulted in preparing a good performance monolithic SCR catalyst.

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“…To determine the binding states of oxygen in 10 V‐3M−Ti samples, the O 1s spectra were also measured. Three peaks centered at binding energies of 529.7, 530.9, and 532.6 eV are observed in Figure (C), which can be identified as follows: (1) peaks at 529.7‐530.9 eV could be assigned to lattice oxygen in TiO 2 (blue curve); (2) peaks in the range of 531–532 eV can be assigned to adsorbed O − species, or oxygen vacancies (green curve); and (3) peaks in the range of 532.5‐533.5 eV can be assigned to adsorbed molecular water (pink curve), respectively. Compared to the 10 V‐3M−Ti‐1 sample with pure anatase crystal phase, the peak intensity for 10 V‐3M−Ti‐4 sample with anatase and rutile mixed phases at 530.8 eV is obviously higher, which provides direct and strong evidence that more oxygen vacancies would be formed.…”

Section: Resultsmentioning

confidence: 56%

Mesoporous V‐TiO₂ Catalysts with Crystalline Anatase‐Rutile Mixed Phases for Naphthalene Degradation

Liu

Qin²,

Zhou

et al. 2019

ChemistrySelect

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A series of V-doped multiphase mixed mesoporous TiO 2 (V-3M-Ti) catalysts with anatase-rutile crystalline phases were prepared with two titanium precursors in the presence of citric acid, and the effect of TiO 2 crystalline structure on the oxidation of naphthalene is deeply discussed in this work for the first time. The physical and chemical properties of these prepared samples were characterized by different techniques including X-ray diffraction (XRD), N 2 sorption, Raman spectra, Uvioletvisible diffuse reflection spectroscopy (Uv-vis DRS), Scanning electron microscope (SEM), Transmission electron microscope (TEM), O 2 -temperature programmed desorption (O 2 -TPD) and X-ray photoelectron spectra (XPS). With the TiCl 4 addition amount in the preparation solution increasing, the rutile phase would be promoted, where more oxygen vacancies were obtained resulting in the formation of the vanadium species with lower valence. The 10V-3M-Ti-4 catalyst with 78% anatase and 22% rutile phase, respectively, good crystallinity, high surface area (298 cm 3 ⋅g -1 ), monomodal mesoporosity (around 5 nm), appropriate oxygen vacancies and low valence vanadium species showed higher catalytic performance in the liquidphase oxidation of naphthalene with hydrogen peroxide than other samples, where the highest naphthalene conversion up to 40.1% can be obtained. The catalytic stability can be preserved well even after reactions for five times using ascorbic acid as reducer, suggesting its potential application for the degradation of naphthalene to the environmental protection.[a] Dr.

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The influence on SCR activity of the atomic structure of V2O5/TiO2 catalysts prepared by a mechanochemical method

Cited by 70 publications

References 41 publications

A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

Enhancement of SCR performance of monolithic Mn–Ce/Al₂O₃/cordierite catalysts by using modified deposition precipitation method

Mesoporous V‐TiO₂ Catalysts with Crystalline Anatase‐Rutile Mixed Phases for Naphthalene Degradation

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The influence on SCR activity of the atomic structure of V2O5/TiO2 catalysts prepared by a mechanochemical method

Cited by 70 publications

References 41 publications

A CuO-V2O5/TiO2Catalyst for the Selective Catalytic Reduction of NO with NH3

A CuO-V2O5/TiO2Catalyst for the Selective Catalytic Reduction of NO with NH3

Enhancement of SCR performance of monolithic Mn–Ce/Al2O3/cordierite catalysts by using modified deposition precipitation method

Mesoporous V‐TiO2 Catalysts with Crystalline Anatase‐Rutile Mixed Phases for Naphthalene Degradation

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A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

A CuO-V₂O₅/TiO₂Catalyst for the Selective Catalytic Reduction of NO with NH₃

Enhancement of SCR performance of monolithic Mn–Ce/Al₂O₃/cordierite catalysts by using modified deposition precipitation method

Mesoporous V‐TiO₂ Catalysts with Crystalline Anatase‐Rutile Mixed Phases for Naphthalene Degradation