Chemical deactivation of V2O5/WO3–TiO2 SCR catalysts by additives and impurities from fuels, lubrication oils and urea solution

Nicosia, Daniele; Czekaj, Izabela; Kröcher, Oliver

doi:10.1016/j.apcatb.2007.07.032

Cited by 247 publications

(105 citation statements)

References 32 publications

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“…ZnCl 2 , or molten K Zn double salts). The surface area with (65 m 2 /g at 400 °C degassing temperature) and the pore structure of the fresh catalyst are in agreement similar catalysts [28]. The total pore volume and the micropore volume, 0.271 and 0.0028 cm 3 /g are also in agreement with similar catalysts.…”

Section: Discussionsupporting

confidence: 73%

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

Brandin

Odenbrand

2017

Catal Lett

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changes in surface area (8% decrease in BET surface area over 2311 h) and pore structure were small, while the change in activity was considerable. The apparent pre-exponential factor was 1.63 × 10 5 (1/min) in the most deactivated catalyst, compared to 2.65 × 10 6 (1/min) in the fresh catalyst, i.e. a reduction of 94%. The apparent activation energy for the fresh catalyst was 40 kJ/mol, decreasing to 27 kJ/mol with increasing deactivation. Characterization showed that catalytic poisoning is mainly due to decreased acidity of the catalyst caused due to increasing amounts of Na and K.Abstract Catalysts used for selective catalytic reduction were deactivated for various times in a slipstream from a municipal solid waste incineration plant and then characterized. The activity for NO reduction with NH 3 was measured. The Brunauer-Emmett-Teller surface areas were determined by N 2 adsorption from which the pore size distributions in the mesopore region were obtained. Micropore areas and volumes were also obtained. The composition of fresh and deactivated catalysts as well as fly ash was determined by atomic absorption spectroscopy and scanning electron microscopy with energy dispersive X-ray analysis. The

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Section: Discussionsupporting

confidence: 73%

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

Brandin

Odenbrand

2017

Catal Lett

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“…Unfortunately, in practice, many kinds of toxic components such as alkali metal, CaO, As 2 O 3 and SO 2 under complex flue gas conditions often result in the deactivation and lifetime reduction of catalysts, thus its replacement cycle in practical application is shortened dramatically [3][4][5]. Since direct landfill not only endangers environment, brings hazard (V, As, Hg, etc.)…”

Section: Introductionmentioning

confidence: 99%

An efficient novel regeneration method for Ca-poisoning V2O5-WO3/TiO2 catalyst

Chen

et al. 2016

Catalysis Communications

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“…severest poisoning effect on the vanadia-based catalysts [15]. Several authors [4,7,8,15,16] concluded that potassium compounds strongly interacted with the dispersed vanadia species and neutralized the Brønsted acid sites, leading to a decrease of adsorption sites for ammonia, which played a crucial role in the NH 3 -SCR mechanism. Potassium doping would result in severe deactivation.…”

mentioning

confidence: 98%

Potassium poisoning on Cu-SAPO-34 catalyst for selective catalytic reduction of NOx with ammonia

Weng

et al. 2015

Chemical Engineering Journal

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Chemical deactivation of V2O5/WO3–TiO2 SCR catalysts by additives and impurities from fuels, lubrication oils and urea solution

Cited by 247 publications

References 32 publications

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

An efficient novel regeneration method for Ca-poisoning V2O5-WO3/TiO2 catalyst

Potassium poisoning on Cu-SAPO-34 catalyst for selective catalytic reduction of NOx with ammonia

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