Improved catalytic performance and resistance to SO2 over V2O5-WO3/TiO2 catalyst physically mixed with Fe2O3 for low-temperature NH3-SCR

Kang, Tae Hun; Youn, Seunghee; Kim, Do Heui

doi:10.1016/j.cattod.2020.07.042

Cited by 39 publications

(14 citation statements)

References 42 publications

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“…At temperatures above 600 °C, the decomposition of metal sulfates does not produce NH3, and the released O2 is well maintained. Based on previous studies [36,54,60,61] and our work, the scheme of the formation and decomposition of AS and ABS is summarized in Figure S2. To compare the sulfate deposition on the sulfated catalysts, the outlet gases (i.e., SO 2 , NH 3 , H 2 O, and O 2 ) during the temperature-programmed decomposition process were analyzed by MS, and the results are provided in Figure 3.…”

Section: Structural Propertiesmentioning

confidence: 99%

“…The durability of low-temperature SCR catalysts in the presence of SO 2 also receives great attention. Kang et al [36] constructed low-temperature SCR catalysts by mechanically mixing commercial V 2 O 5 -WO 3 /TiO 2 with Fe 2 O 3 , and the obtained catalysts exhibited higher catalytic stability in the presence of SO 2 than V 2 O 5 -WO 3 /TiO 2 . They discovered that the formation of ammonium sulfates was hindered due to the production of iron sulfates from adjacent Fe 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

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Tungsten Oxide Modified V2O5-Sb2O3/TiO2 Monolithic Catalyst: NH3-SCR Activity and Sulfur Resistance

Liu

et al. 2022

Processes

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In this study, a V2O5-Sb2O3/TiO2 monolithic catalyst was modified by introducing WO3. The WO3-modified catalyst exhibited enhanced catalytic activity in the measuring temperature range of 175–320 °C. The changes in dispersion of vanadia species were investigated by ultraviolet-visible (UV-Vis) spectroscopy and H2 temperature-programmed reduction (H2-TPR). A durability test was conducted in a wet SO2-containing atmosphere at 220 °C for 25 h. The sulfate deposition was estimated by temperature-programmed decomposition (TPDC) of sulfates, thermo-gravimetric (TG) analysis, and temperature-programmed desorption (TPD) of NH3. Isothermal SO2 oxidation and temperature-programmed surface reaction (TPSR) of NH4HSO4 with NO were performed. Based on these characterizations, effects of WO3 modification on the sulfate tolerance of the catalyst were explored.

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Section: Structural Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tungsten Oxide Modified V2O5-Sb2O3/TiO2 Monolithic Catalyst: NH3-SCR Activity and Sulfur Resistance

Liu

et al. 2022

Processes

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“…Liang et al [44] put forward that adding moderate F ions would erode the surface morphology of the catalyst and reduce its particle size, so as to improve the NO conversion rate at low temperature and the sulfur and water resistance of V2O5-WO3/TiO2 catalyst. Kang et al [45] reveals the reason for sample obtained after the physical mixing of V2O5-WO3/TiO2 with several Fe2O3 has superior performance through a series of representational means (SO2-TPD, NH3-TPD and in situ FT-IR), which attributable to the following two reasons: (1) Fe2O3 adjacent to V2O5-WO3/TiO2 inhibited the formation of NH4SO4 by generating FeSO4 (2) The formation of FeSO4 provides additional Brønsted acid sites, which promotes the conversion of NOx. The mechanism of sulfate species formation over catalysts was illustrated in Fig.…”

Section: Vanadium-based Catalystsmentioning

confidence: 99%

Recent advances in heighten sulfur resistance of SCR catalysts: A review

Zhao

Zhang

Kang

2021

Environmental Engineering Research

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NOx removal by selective catalytic reduction (SCR) technology is a research hotspot in the field of environmental catalysis, and this method is dominated by catalysts. However, denitrification catalyst is easy to be polluted by the presence of SO2, which seriously restricts its practical industrial application. This review focuses on the latest domestic and foreign research results and advancement in improving sulfur resistance of deNOx catalysts, reveals the sulfur poisoning mechanism and regeneration process, as well as introduces the positive role of quantum chemistry in the field of sulfur resistance. In view of the questions set forth in this review, the future development direction of deNOx catalysts is prospected, which provides valuable scientific guidance for the design and development of efficient and practical sulfur resistant deNOx catalysts.

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“…Acidity can improve the adsorption and activation of chlorinated organic molecules on the catalyst surface, and oxidizability is helpful for the deep oxidation of intermediates to form CO 2 and H 2 O [17][18][19][20][21]. Moreover, it is worth noting that FeO x has the advantages of noticeable oxidizability and strong interaction with other substances [42][43][44][45]. Combination of two different elements often produces structural change and new properties, which may easily cause lattice distortion, increase catalytic active centers and promote redox performance.…”

Section: Introductionmentioning

confidence: 99%

“…Combination of two different elements often produces structural change and new properties, which may easily cause lattice distortion, increase catalytic active centers and promote redox performance. Therefore, in the past, the low-cost tungsten-iron composite oxide catalysts were tested for selective catalytic reduction of NO x by NH 3 [43][44][45], but few researches have been done for exploring their possible application in catalytic degradation of waste gas pollutants containing Cl-VOCs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

et al. 2021

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Emission of volatile organic compounds has important influence on complex air pollution and human health. In this paper, a series of tungsten-iron composite oxides with different proportions and preparation methods were synthesized and first used for catalytic combustion of chlorobenzene and toluene, as typical polluting gas sources. These WO 3 -based solid catalytic materials were systematically characterized by modern analytical methods, and the results showed that there was strong electron interaction between W and Fe elements in the composite oxides, and the presence of a certain amount of tungsten oxide inhibited the crystallization of iron oxide, and vice versa, which were beneficial to the uniform dispersion of tungsten-iron components into each other and the improvement of redox properties. Compared with single-component oxide, the formation of tungsten-iron composite oxide affected the micro-structure, improved the specific surface area and optimized the pore structure of materials. The performance test results showed that the tungsten-iron composite oxide (FeWO 4 -0.5Fe 2 O 3 , molar ratio of tungsten and iron was 1/2) prepared using citric acid-based sol-gel method was the optimal, and its catalytic degradation efficiency could reach 90% for chlorobenzene and 83% for toluene at 320 °C, and maintain at least 60 h without obvious deactivation, with high selectivity to the formation of HCl and CO 2 . KeywordsVolatile organic compounds • Catalytic combustion • WO 3 • FeWO 4 • Composite oxide • Synergistic catalytic effect Tungsten www.springer.com/42864

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Improved catalytic performance and resistance to SO2 over V2O5-WO3/TiO2 catalyst physically mixed with Fe2O3 for low-temperature NH3-SCR

Cited by 39 publications

References 42 publications

Tungsten Oxide Modified V2O5-Sb2O3/TiO2 Monolithic Catalyst: NH3-SCR Activity and Sulfur Resistance

Tungsten Oxide Modified V2O5-Sb2O3/TiO2 Monolithic Catalyst: NH3-SCR Activity and Sulfur Resistance

Recent advances in heighten sulfur resistance of SCR catalysts: A review

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

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