Effect of pore structure of TiO 2 on the SO 2 poisoning over V 2 O 5 /TiO 2 catalysts for selective catalytic reduction of NO x with NH 3

Youn, Seunghee; Song, In Kyu; Lee, Hwangho; Cho, Sung June; Kim, Do Heui

doi:10.1016/j.cattod.2017.08.015

Cited by 40 publications

(24 citation statements)

References 28 publications

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“…Both ammonia slip and sulfur trioxide influence the formation of ammonium bisulfates (ABS), sticky and corrosive substances that block active sites on the catalyst [17,42,73,74]. According to Wang et al [75], the deposition of 30% wt.…”

Section: Ammonia Bisulfate Formationmentioning

confidence: 99%

“…The major drawback of V 2 O 5 -WO 3 /TiO 2 catalyst is its toxicity and the poor stability of vanadium, reduced activity at low temperature (below 250 • C) as well as a relatively narrow temperature window [10,13,14]. However, the catalyst is known for its high activity and resistance to SO 2 [5,[15][16][17][18]. According to literature, V 2 O 5 −WO 3 /TiO 2 catalysts work best in temperatures 300 ÷ 400 • C [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

et al. 2020

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Nitrogen dioxide is one of the most dangerous air pollutants, because its high concentration in air can be directly harmful to human health. It is also responsible for photochemical smog and acid rains. One of the most commonly used techniques to tackle this problem in large combustion plants is selective catalytic reduction (SCR). Commercial SCR installations are often equipped with a V2O5−WO3/TiO2 catalyst. In power plants which utilize a solid fuel boiler, catalysts are exposed to unfavorable conditions. In the paper, factors responsible for deactivation of such a catalyst are comprehensively reviewed where different types of deactivation mechanism, like mechanical, chemical or thermal mechanisms, are separately described. The paper presents the impact of sulfur trioxide and ammonia slip on the catalyst deactivation as well as the problem of ammonium bisulfate formation. The latter is one of the crucial factors influencing the loss of catalytic activity. The majority of issues with fast catalyst deactivation occur when the catalyst work in off-design conditions, in particular in too high or too low temperatures.

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Section: Ammonia Bisulfate Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

et al. 2020

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“…The metal oxide is also over-oxidized, which not only oxidizes NH 3 to N 2 O and NO, but also oxidizes SO 2 to SO 3 . The generated SO 3 continues to react with NH 3 to generate ammonium sulfate species, thereby plugging the pores and masking the active sites, thus decreasing the activity of the SCR reaction [25]. The inevitable soot and some alkali metals in factory waste can also affect the activity of catalysts and even lead to deactivation of catalysts [4,5,26].…”

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Zhang

Chen

et al. 2018

Materials

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Selective catalytic reduction of NOx with NH3 is one of the most widely used technologies in denitration. Vanadium-based catalysts have been extensively studied for the deNOx process. V2O5/WO3(MoO3)TiO2 as a commercial catalyst has excellent catalytic activity in the medium temperature range. However, it has usually faced several problems in practical industrial applications, including narrow windows of operation temperatures, and the deactivation of catalysts. The modification of vanadium-based catalysts will be the focus in future research. In this paper, the chemical composition of vanadium-based catalysts, catalytic mechanism, the broadening of the temperature range, and the improvement of erosion resistance are reviewed. Furthermore, the effects of four major systems of copper, iron, cerium and manganese on the modification of vanadium-based catalysts are introduced and analyzed. It is worth noting that the addition of modified elements as promoters has greatly improved the catalytic performance. They can enhance the surface acidity, which leads to the increasing adsorption capacity of NH3. Surface defects and oxygen vacancies have also been increased, resulting in more active sites. Finally, the future development of vanadium-based catalysts for denitration is prospected. It is indicated that the main purpose for the research of vanadium-based modification will help to obtain safe, environmentally friendly, efficient, and economical catalysts.

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“…For SCR catalysts, V 2 O 5 /TiO 2 catalysts have attracted much attention due to their low temperature activity and environmental friendliness [5]- [10]. Therefore, the study of modified V 2 O 5 /TiO 2 catalytic system has great practical significance [11].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance of Ti3+ Self-Doped V2O5-TiO2 Catalysts for Selective Catalytic Reduction with NH3

Zhang¹,

Zhao²,

Dou³

et al. 2020

MSCE

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Ti 3+ self-doping modified V 2 O 5 /TiO 2 catalyst was prepared by sol-gel and impregnation methods and used for selective catalytic reduction (SCR) of NO x with NH 3. Results showed that Ti 3+ self-doped V 2 O 5 /TiO 2 catalyst performed the better catalytic activity. And X-ray diffraction and scanning electron microscopy were used to evaluate the phase composition and morphology of the prepared catalyst. The effects of calcinations temperature of the support, oxygen concentration, [NH 3 ]/[NO] molar ratio and the GHSV on the denitration performance were investigated. It was found that more than 80% NO x conversion was obtained at 210˚C when the O 2 volume fraction was 5%, the NO concentration was 500 ppm, the [NH 3 ]/[NO] molar ratio = 1 and the GHSV was 23,885 h −1. The results showed that the catalytic activity increased first with the increasing of O 2 concentration and [NH 3 ]/[NO] molar ratio, then remained stable. At the same time, the stability of the catalyst was also studied at the temperature of 210˚C. The reaction continued for 750 minutes, and the catalytic activity remained above 80%, indicating that the catalyst has a good stability. Moreover, the Ti 3+ self-doped V 2 O 5 /TiO 2 catalyst also showed good SO 2 and H 2 O resistance. Therefore, these findings provide important information to better understand the application of the prepared catalyst.

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Effect of pore structure of TiO 2 on the SO 2 poisoning over V 2 O 5 /TiO 2 catalysts for selective catalytic reduction of NO x with NH 3

Cited by 40 publications

References 28 publications

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Catalytic Performance of Ti<sup>3+</sup> Self-Doped V<sub>2</sub>O<sub>5</sub>-TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction with NH<sub>3</sub>

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Effect of pore structure of TiO 2 on the SO 2 poisoning over V 2 O 5 /TiO 2 catalysts for selective catalytic reduction of NO x with NH 3

Cited by 40 publications

References 28 publications

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Catalytic Performance of Ti&lt;sup&gt;3+&lt;/sup&gt; Self-Doped V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;-TiO&lt;sub&gt;2&lt;/sub&gt; Catalysts for Selective Catalytic Reduction with NH&lt;sub&gt;3&lt;/sub&gt;

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Catalytic Performance of Ti<sup>3+</sup> Self-Doped V<sub>2</sub>O<sub>5</sub>-TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction with NH<sub>3</sub>