Property influence and poisoning mechanism of HgCl2 on V2O5-WO3/TiO2 SCR-DeNO  catalysts

Kong, Ming; Liu, Qingcai; Jiang, Lijun; Guo, Fuqiang; Ren, Shan; Yao, Lu; Yang, Jian

doi:10.1016/j.catcom.2016.07.011

Cited by 15 publications

(4 citation statements)

References 32 publications

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“…As introduced in Section 2.5, alkaline and alkaline earth metals have a negative effect. Following the study of Chen et al [63], further investigations on alkali ions as well as on other poisoning species have drawn great attention: Hg [64][65][66], alkali metals [66][67][68][69][70], P [69], Cr [69], Cu [69], Mg [69], Ca [69,71], and As [72]. The main poisoning elements and corresponding reasons for catalysts' deactivation are listed in Table 5.…”

Section: Deactivation or Poisoning Mechanismmentioning

confidence: 99%

“…[71] As As 2 O 5 dense layers derived from the ab-As 2 O 3 oxidized of by chemisorption oxygen on catalyst surface prevent NH 3 adsorption and active sites recovery. [72] Kong et al [64] investigated the HgCl 2 deactivation mechanism over V 2 O 5 -WO 3 /TiO 2 SCR catalysts. The results showed that HgCl 2 caused an agglomeration of active components, the BET surface area decreased significantly, and the reaction of HgCl 2 with Brønsted acid sites (V-OH) occurred.…”

Section: Kclmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhang

Pantaleo

et al. 2019

Catalysts

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Researchers in the field of the selective catalytic reduction (SCR) of nitrogen oxides (NOx: NO, NO2, or N2O) by NH3 are still greatly challenging the optimization of low-temperature activity and selectivity, high-temperature stability, resistance to alkali metals and other poisoning agents, such as Hg, As, etc. The present study reviews the research progress, related to the latest 20 years, on WO3–V2O5-based catalysts that are expected to overcome the catalytic performances of the current SCR catalytic devices. In details, the effects of the synthesis methods, chemical composition, type of supports (metal oxides, molecular sieves, and filters), doping elements, or metal oxides added as promoters of WO3–V2O5-based catalysts and, finally, the influence of SO2 and H2O in the reaction mixture are addressed. The importance of understanding the deactivation mechanism in the presence of several poisoning agents is also emphasized, which should be taken into consideration for the design of new catalysts.

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Section: Deactivation or Poisoning Mechanismmentioning

confidence: 99%

Section: Kclmentioning

confidence: 99%

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

Zhang

Pantaleo

et al. 2019

Catalysts

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“…165 It has been proved that heavy metals could lead to the deactivation of vanadiumbased SCR catalysts. 166 Kong et al 167 found that the Brønsted acid sites of a V-W/TiO 2 catalyst were impacted when mercury chloride was introduced. Actually, there is little heavy metal ions found in the downstream of the precipitator because the heavy metal ions usually exist in the y ash.…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

et al. 2017

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“…Yu et al [14,15] suggested that SO 2 in the flue gas promoted the activity of K-and Pb-poisoned catalysts. Kong et al [16] discovered that new acid sites generated on the SCR catalyst by loading HgCl 2 . Our recent work indicated SO 2 and HCl can promote the activity of Pb-poisoned SCR catalyst [4].…”

Section: Introductionmentioning

confidence: 99%

Poisoning Effects of Phosphorus, Potassium and Lead on V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with NH3

Miao

et al. 2020

Catalysts

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The poisoning effect of single elements on commercial V2O5-WO3/TiO2 catalysts has been studied in the past decades. In this study, the combined effects of two multi-element systems (phosphorus-potassium and phosphorus-lead) on V2O5-WO3/TiO2 catalysts were studied by diverse characterizations. The results show that potassium and lead can result in the deactivation of catalysts to different degrees by reacting with active acid sites and reducing the amount of V5+. However, phosphorus displays slight negative influence on the NOx conversion of the catalyst due to the comprehensive effect of reducing V5+ amount and generating new acid sites. The samples poisoned by phosphorus–potassium and phosphorus–lead have higher NOx conversion than that by potassium or lead, because doped potassium or lead atoms may react with new acid sites generated by phosphate, which liberates more V–OH on the surface of catalysts and reduces the poisoning effects of potassium or lead on vanadium species and active oxygen species.

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Property influence and poisoning mechanism of HgCl2 on V2O5-WO3/TiO2 SCR-DeNO catalysts

Cited by 15 publications

References 32 publications

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

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

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

Poisoning Effects of Phosphorus, Potassium and Lead on V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with NH3

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Property influence and poisoning mechanism of HgCl2 on V2O5-WO3/TiO2 SCR-DeNO catalysts

Cited by 15 publications

References 32 publications

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

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

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOx with NH3: reaction mechanism and catalyst deactivation

Poisoning Effects of Phosphorus, Potassium and Lead on V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with NH3

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A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation