Reduced graphene oxide supported V2O5-WO3-TiO2 catalysts for selective catalytic reduction of NOx

Lee, Minwoo; Ye, Bora; Jeong, Bora; Chun, Hye-yeon; Lee, Jun Young; Park, Sam-Sik; Lee, Heesoo; Kim, Hong-Dae

doi:10.1007/s11814-018-0109-6

Cited by 14 publications

(6 citation statements)

References 39 publications

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“…On the other hand, the surplus O 2 can be stored under O 2 -rich condition and also broaden the conversion range for NO. 25 Furthermore, the conversion of NO sharpens quickly when λ increases to a certain value in the O 2 -rich condition. As λ is 1.005, the conversions of the three gases all reach about 100%.…”

Section: Resultsmentioning

confidence: 99%

Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst

Zhao

Wang

Liu

et al. 2019

Nanomaterials and Nanotechnology

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This work aimed at exploring a new kind of purification catalysts for fuel ethanol engine exhaust. Platinum loaded on Ce0.5Zr0.5O2 was prepared by impregnation method and characterized by X-ray diffraction, Brunner–Emmet–Teller measurements (BET), temperature-programmed reduction of hydrogen, scanning electron microscope, and X-ray photoelectron spectra. The three-way catalyst platinum/ceria–zirconia/fw is prepared with the paste ball mill coating technique. And the catalytic performance is evaluated under simulated fuel ethanol engine exhaust gas condition. The catalysts not only show excellent low-temperature performances and several-way catalytic activities for carbon monoxide, hydrocarbons, nitrogen oxides, and acetaldehyde but also have better high-temperature resistance. The addition of sulfur dioxide to feedstream degrades the performances of the catalysts.

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Section: Resultsmentioning

confidence: 99%

Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst

Zhao

Wang

Liu

et al. 2019

Nanomaterials and Nanotechnology

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“…to the reduction of V 5+ to V 3+ in the vanadium oxides, the reduction of W 6+ to W 4+ , and the reduction of W 4+ to W 0 in the tungsten oxide, respectively [31][32][33]. After coating the NH4 + layer on the V2O5-WO3/TiO2 catalyst surface, the reduction peaks shifted to lower temperatures of 385.6 °C, 461.2 °C, and 778.7 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…+ layer, we analyzed the H 2 -temperature-programmed reduction profiles (Figure 5d). V 2 O 5 -WO 3 /TiO 2 exhibited three reduction peaks at 397.1 • C, 480.2 • C, and 800.8 • C, which were assigned to the reduction of V 5+ to V 3+ in the vanadium oxides, the reduction of W 6+ to W 4+ , and the reduction of W 4+ to W 0 in the tungsten oxide, respectively [31][32][33]. After coating the NH 4 + layer on the V 2 O 5 -WO 3 /TiO 2 catalyst surface, the reduction peaks shifted to lower temperatures of 385.6 • C, 461.2 • C, and 778.7 • C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

et al. 2021

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Selective catalytic reduction (SCR) is the most efficient NOX removal technology, and the vanadium-based catalyst is mainly used in SCR technology. The vanadium-based catalyst showed higher NOX removal performance in the high-temperature range but catalytic efficiency decreased at lower temperatures, following exposure to SOX because of the generation of ammonium sulfate on the catalyst surface. To overcome these limitations, we coated an NH4+ layer on a vanadium-based catalyst. After silane coating the V2O5-WO3/TiO2 catalyst by vapor evaporation, the silanized catalyst was heat treated under NH3 gas. By decomposing the silane on the surface, an NH4+ layer was formed on the catalyst surface through a substitution reaction. We observed high NOX removal efficiency over a wide temperature range by coating an NH4+ layer on a vanadium-based catalyst. This layer shows high proton conductivity, which leads to the reduction of vanadium oxides and tungsten oxide; additionally, the NOX removal performance was improved over a wide temperature range. These findings provide a new mothed to develop SCR catalyst with high efficiency at a wide temperature range.

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“…5 Graphene and its derivatives (graphene oxide and reduced graphene oxide [rGO]), due to their extraordinary properties such as high electrical conductivity (10 7 cm 2 V −1 second −1 ), 6 high thermal conductivity (5300 W.m -1 K -1 ), 7 astonishing strength, lightweight structure, and large surface area (2630 m 2 .g -1 ) 8 become an outstanding part of the nanotechnology. 9 Mechanical exfoliation of graphite, liquid phase high shear delamination, epitaxial growth, chemical vapor deposition (CVD), and liquid phase reduction of graphite oxide are the main fabrication routes of graphene and its derivatives. 10 Among them, the chemical synthesis of rGO via oxidation of graphite to graphene oxide (GO) and its reduction is the most promising one due to being a simple, effective, and high yielded technique.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the electrical and thermal performance of reduced graphene oxide coated cotton fabric

Koçanalı

Apaydın-Varol

2021

Int J Energy Res

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In this study, reduced graphene oxide (rGO) is produced from graphite by using the modified Hummers method. In order to understand the usage of rGO for smart textile applications, the cotton fabric is coated via the dip and dry method to see the effect of rGO coating, number of dip and dry cycles on the changes of thermal and electrical resistance of the fabric. Graphene oxide (GO) and rGO Highlights• Reduced graphene oxide (rGO) was successfully prepared from graphite via the modified Hummers' method.• Biodegradable and sustainable cotton fabric was coated with rGO to improve its electrical and thermal properties using a simple dip and dry method.• No binding agent was used during the coating process.• The increase in the rGO content decreased the surface electrical resistivity while increasing the thermal stability of the cotton fabric.

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Reduced graphene oxide supported V2O5-WO3-TiO2 catalysts for selective catalytic reduction of NOx

Cited by 14 publications

References 39 publications

Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst

Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

An experimental study on the electrical and thermal performance of reduced graphene oxide coated cotton fabric

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Reduced graphene oxide supported V2O5-WO3-TiO2 catalysts for selective catalytic reduction of NOx

Cited by 14 publications

References 39 publications

Purification of fuel ethanol engine exhaust with platinum-loaded Ce0.5Zr0.5O2 catalyst

Purification of fuel ethanol engine exhaust with platinum-loaded Ce0.5Zr0.5O2 catalyst

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

An experimental study on the electrical and thermal performance of reduced graphene oxide coated cotton fabric

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Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst

Purification of fuel ethanol engine exhaust with platinum-loaded Ce_0.5Zr_0.5O₂ catalyst