Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction

Youn, Seunghee; Jeong, So‐Yeon; Kim, Do Heui

doi:10.1016/j.cattod.2014.01.025

Cited by 57 publications

(41 citation statements)

References 47 publications

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“…21 The reduction peak around 400-500 C is due to the surface vanadium oxide, while high temperature peak over 700 C is assigned to the reduction of bulk vanadium oxide. 22 Niobium oxide could be reduced at much higher temperature.…”

Section: Resultsmentioning

confidence: 99%

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Lian

Liu

et al. 2015

RSC Adv.

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The promotion effect of Nb addition to VO x /CeO 2 catalysts for the selective catalytic reduction of NO x by NH 3 was fully investigated. VO x /CeO 2 and NbO x doped VO x /CeO 2 catalysts were characterized by N 2 physisorption, XRD, H 2 -TPR and NH 3 -TPD. The results showed that the addition of Nb could significantly promote the SCR activity of the VO x /CeO 2 catalyst, especially in the low temperature range. VO x /CeO 2 with 30 wt% NbO x catalyst showed the best catalytic performance and better SO 2 /H 2 O tolerance than VO x /CeO 2 catalyst. 30Nb-1VO x /CeO 2 also exhibited higher NH 3 -SCR activity than 3V 2 O 5 -WO 3 /TiO 2 .Lower crystallinity, stronger redox capability and more Brønsted acid sites of the Nb-VO x /CeO 2 catalyst were all responsible for its more excellent NH 3 -SCR performance. Based on kinetic experiments and in situ DRIFTS results, it was concluded that the Langmuir-Hinshelwood mechanism existed for selective catalytic reduction of NO over Nb-VO x /CeO 2 , in which adsorbed NO x species reacted with adsorbed NH 3 to finally form N 2 and H 2 O.

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Section: Resultsmentioning

confidence: 99%

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Lian

Liu

et al. 2015

RSC Adv.

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“…The titanium dioxide in anatase form contains some trace amounts of brookite and Ti 6 O which have no considerable affects on catalytic reactions. Polyvanadate xerogels were prepared by sol-gel method using ammonia as the precursor template at different pH and temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The first industrial catalyst used for oxidation of o-xylene was V 2 O 5 , then at the end of 1960s it was replaced by V 2 O 5 /TiO 2 . [5,6] Oxidation of o-xylene by V 2 O 5 /TiO 2 and V 2 O 5 /ZrO 2 yields the industrially important product À phthalic anhydrate. [7] Earlier [8] the vanadium pentaoxide was deposited on Al, Si, Ti oxides by different methods.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Properties of Polyvanadate Xerogels Supported to Anatase in Decomposition of Hydrogen Peroxide and Oxidation of o‐Xylene

Yesmurzayeva

Malibekova

Selenova

2016

Macromolecular Symposia

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Summary: The present work deals with evaluation of the catalytic properties of polyvanadate xerogels deposited on titanium dioxide (anatase). Xerogels of polyvanadates in the form of nanofibers were obtained by sol-gel method. The average sizes of polyvanadate nanoparticles in aqueous solution determined by DLS were equal to 7 and 50 nm. TEM results reveal the formation of nanostructured thin layers of polyvanadates on the surface of TiO 2 particles. The catalytic properties of polyvanadates deposited on the surface of anatase by impregnation method were studied with respect to decomposition of hydrogen peroxide and oxidation of o-xylene under mild conditions.

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“…Although V 2 O 5 /TiO 2 system promoted by MoO 3 or WO 3 has been successfully used as commercial SCR catalyst, narrow operating temperature window (300-400°C) limits its application [1,2]. Considering more stringent regulation in the near future, not only excellent NO x reduction ability at low temperature below 200°C, but also high N 2 selectivity in wide temperature would be required for SCR catalyst.…”

Section: Introductionmentioning

confidence: 98%

Characteristics of Manganese Supported on Hydrous Titanium Oxide Catalysts for the Selective Catalytic Reduction of NOx with Ammonia

2016

Self Cite

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Mn oxide supported on two different groups of titania, hydrous or crystalline titanium oxide, were investigated for the selective catalytic reduction of NO x with NH 3 (NH 3 SCR). Hydrous titania was prepared by hydrolysis of titanium tetraisopropoxide followed by drying, and crystalline titanium oxide was prepared with further calcination of the hydrous titania. Mn supported on hydrous TiO 2 catalyst exhibited higher NO x conversion over wide temperature range (150-400°C) as well as the suppressed formation of nitrous oxide compared to Mn supported on crystalline TiO 2 . Also, Mn/hydrous TiO 2 showed relatively lower performance in ammonia oxidation than Mn/crystalline TiO 2 which is regarded as the side reaction. Several combined characterization results indicate that manganese species more strongly interact with hydrous TiO 2 than crystalline TiO 2 , resulting in different redox behavior and oxidation state of Mn oxides. It can be concluded that the activity and selectivity of Mn/TiO 2 catalysts in NH 3 SCR reaction were affected by initial state of titania support.

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Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction

Cited by 57 publications

References 47 publications

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Catalytic Properties of Polyvanadate Xerogels Supported to Anatase in Decomposition of Hydrogen Peroxide and Oxidation of o‐Xylene

Characteristics of Manganese Supported on Hydrous Titanium Oxide Catalysts for the Selective Catalytic Reduction of NOx with Ammonia

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Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction

Cited by 57 publications

References 47 publications

Nb-doped VOx/CeO2 catalyst for NH3-SCR of NOx at low temperatures

Nb-doped VOx/CeO2 catalyst for NH3-SCR of NOx at low temperatures

Catalytic Properties of Polyvanadate Xerogels Supported to Anatase in Decomposition of Hydrogen Peroxide and Oxidation of o‐Xylene

Characteristics of Manganese Supported on Hydrous Titanium Oxide Catalysts for the Selective Catalytic Reduction of NOx with Ammonia

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Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures