WO3–V2O5 Active Oxides for NOx SCR by NH3: Preparation Methods, Catalysts’ Composition, and Deactivation Mechanism—A Review

Zhang, Weidong; Qi, Shuhua; Pantaleo, G.; Liotta, Leonarda Francesca

doi:10.3390/catal9060527

Cited by 39 publications

(17 citation statements)

References 77 publications

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“…It can be concluded that TGA profiles of all spent catalysts using in the reaction exhibited similar activity (not shown data). At temperature higher than 200 °C, it was found that the addition of tungsten into TiO2 catalysts promoted the coke formation due to the interaction between W and TiO2 support introducing the catalyst burning [21,22]. The amount of coke formation in spent catalysts were determined and reported in Table 3.…”

Section: Thermal Gravimetric Analysis (Tga)mentioning

confidence: 99%

Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Kerdnoi

Autthanit

Chitpong

et al. 2019

Bull. Chem. React. Eng. Catal.

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This study aims to investigate the catalytic behaviors on W/TiO2 catalysts having different phases of TiO2 towards catalytic dehydration of ethanol to higher value products including ethylene, diethyl ether, and acetaldehyde. In fact, TiO2 support with different crystalline phases can result in differences of physico-chemical properties of the catalyst. Therefore, the present work reports on the catalytic behaviors that were altered with different phases of TiO2 in catalytic ethanol dehydration to diethyl ether or ethylene as a major product. To prepare the catalysts, three different phases [anatase (A), rutile (R), and mixed phases (P25)] of TiO2 supports were impregnated with 10 wt% of tungsten (W). It was found that the W/TiO2-P25 catalyst revealed higher activity among other catalysts. At 300 °C, all catalysts can produce the diethyl ether yield of 24.1%, 22.8%, and 10.6% for W/TiO2-P25, W/TiO2-A, and W/TiO2-R catalysts, respectively. However, when the reaction temperature was increased to 400°C, ethylene is the major product. The W/TiO2-P25 and W/TiO2-A catalysts render the ethylene yield of 60.3% and 46.2%, respectively, whereas only 15.9% is obtained from W/TiO2-R catalyst. The most important parameter influencing their catalytic properties appears to be the proper pore structure, acidity, and distribution of W species. Copyright © 2019 BCREC Group. All rights reserved

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Section: Thermal Gravimetric Analysis (Tga)mentioning

confidence: 99%

Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Kerdnoi

Autthanit

Chitpong

et al. 2019

Bull. Chem. React. Eng. Catal.

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“…SCR catalysts consisting of V 2 O 5 -WO 3 /TiO 2 generally have very high Ti, W and V content, so it can be an economic and environmental feasible option to recover and reuse them. Ti, W, and V remanufactured after recovery can be used as raw materials for new catalysts or as raw materials in other industries 4,12,13 . Accordingly, technology development studies are actively being conducted to recover and remanufacture raw materials from waste catalysts 14 .…”

Section: Introductionmentioning

confidence: 99%

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

Jeon

Sola

Lee

et al. 2021

Preprint

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Spent catalyst, containing vanadium and tungsten oxide in a TiO2 glass fiber matrix, pose a risk of environmental contamination due to the high toxicity of its metal oxides if leached into the soil when disposed in landfills. Due to the increasing demand of metals and the continuous depletion of primary resources there is an growing necessity for recycling and reprocessing of spent catalysts and other secondary metal sources for environmental and economical reasons. Study of spent SCR catalyst soda roasting process with dissolved NaOH compared with the usual NaOH dry roasting and its influence in the subsequent water leaching. After optimization, the ideal parameters are roasting with 40% NaOH solution for 2h at 973K and DI water leaching for 30minutes, at 298K with a pulp density of 30%. The research results show an important reduction of the roasting temperature and leaching time during the processing of spent SCR catalyst with the objective to recover vanadium and tungsten. Silicon compounds are one of the main impurities leached alongside the valuable metals and in this work, the silicon compounds leached are reduced significantly avoiding the de-silication post-processing of the leach liquor. The main advantage of the proposed process is the increase of the leaching efficiency of vanadium and tungsten in a shorter time regardless of the leaching temperature.

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“…Selective catalytic reduction with NH 3 (NH 3 -SCR) is the most popular technology to eliminate the emission of nitrogen oxides (NO x ) from industrial flue gas, in which the DeNO x catalysts play the key role due to their high denitration (DeNO x ) efficiency [1][2][3][4]. As the most common commercial catalyst, the honeycomb DeNO x catalysts are largely produced though an extrusion process using industrial titanium dioxide or titanium-tungsten as Ti sources [5][6][7]. To reduce the production cost, our previous study invented a simplified technology process to produce honeycomb catalyst using filter cake as the Ti source derived from hydrothermal treatment of the metatitanic acid precursor [8].…”

Section: Introductionmentioning

confidence: 99%

The Structure Effect on the Activity and Strength of an Industrial Honeycomb Catalyst Derived from Different Ti Sources

Abubakar

Huangfu

et al. 2019

Catalysts

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A new honeycomb production process was proposed with both filter cake (from hydrothermal treatment of metatitanic acid) and industrial titanium dioxide as Ti sources. The strength of the obtained pilot product was comparable with the current industrial honeycomb product from only filter cake, but its denitration (DeNOx) efficiency was elevated up to 15 percentage points. Multiple characterizations revealed the filter cake and industrial titanium dioxide to be composed of primary particles and secondary particles, respectively, and the introduced secondary particles from industrial titanium dioxide resulted in increased specific surface area and pore size/volume, facilitating the exposure of more active sites with improved activity. Moreover, a positive correlation property was found between the honeycomb strength and crystallinity for the samples from different titanium sources. The filter cake with rich hydroxyl groups and weak crystallinity could be fused more easily among these primary particles to have a higher strength than industrial titanium dioxide, and the primary particle of the filter cake could fill the pile pore of industrial titanium dioxide and act as a solid phase binder to acquire good strength for the honeycomb using both the filter cake and titanium dioxide as Ti sources. The improved honeycomb product with good activity and strength may have more widespread application for the purification of low temperature flue gas in industry.

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WO3–V2O5 Active Oxides for NOx SCR by NH3: Preparation Methods, Catalysts’ Composition, and Deactivation Mechanism—A Review

Cited by 39 publications

References 77 publications

Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

The Structure Effect on the Activity and Strength of an Industrial Honeycomb Catalyst Derived from Different Ti Sources

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