The influence of poisoning on the deactivation of DeNOx catalysts

Kiełtyka, Marcin; Dias, Ana Paula Soares; Kubiczek, Henryk; Sarapata, Bartosz; Grzybek, Teresa

doi:10.1016/j.crci.2015.05.004

Cited by 12 publications

(12 citation statements)

References 42 publications

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“…where, ∆x is the relative loss of activity, x the conversion, and indices 0 and t stand for times of exposure [81]. The blockage of active sites as a result of poisoning are discussed in detail elsewhere [62,[79][80][81][82][83]. Table 4 shows the types, treatment, and causes of catalyst deactivation.…”

Section: Catalyst Deactivationmentioning

confidence: 99%

“…The term NOx is referred to as the oxides of nitrogen (NO, NO 2 , NO 3 , N 2 O 3 , N 2 O 4 , N 2 O 5 , NO, and NO 2 ) [10]. NO 2 comprises of 95% of NOx produced as a result of combustion processes and is stated to contribute to air emissions by several researchers [81,124,130]. NO 2 is a red-brown gas that can readily form nitric acid when it is reacted with H 2 O.…”

Section: Nox Removal From Flue Gasmentioning

confidence: 99%

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Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

et al. 2020

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The emission of untreated environmental harmful gases such as sulfur and nitrogen oxide (SOx and NOx) emissions is considered old fashioned, since industries are compelled by governments and legislations to meet the minimum threshold before emitting such substances into the atmosphere. Numerous research has been done and is ongoing to come up with both cost-effective equipment and regenerable catalysts that are adsorbent—or with enhanced sorption capacity—and with safer disposal methods. This work presents the general idea of a monolith/catalyst for environmental application and the technicality for improving the surface area for fast and efficient adsorption–desorption reactions. The chemical reactions, adsorption kinetics, and other properties, including deactivation, regeneration, and the disposal of a catalyst in view of environmental application, are extensively discussed.

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Section: Catalyst Deactivationmentioning

confidence: 99%

Section: Nox Removal From Flue Gasmentioning

confidence: 99%

Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

et al. 2020

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“…Despite many advantages, catalysts tend to lose their activity over time. Kiełtyka et al [2] indicated, that in a typical coal-fired power plant with biomass co-firing, V 2 O 5 −WO 3 /TiO 2 commercial catalyst can lose 10% of its activity already after 2000 h of operation, and 20% after nearly 5000 h. According to Zheng et al [3], the rate of deactivation of V 2 O 5 −WO 3 /TiO 2 catalyst installed on a straw-fired boiler can be as high as 1% per day of operation. Eventually catalytic layers need to be replaced every 2-3 years (in commercial installations), and new ones are relatively expensive [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The major reason for V 2 O 5 −WO 3 /TiO 2 catalyst deactivation is, however, related to interactions with alkali metals present in flue gas. As the temperature required by the V 2 O 5 −WO 3 /TiO 2 catalyst is relatively high, the most common position of the SCR installation is upstream of the dust collector (called a high-dust SCR)[2,6,85]. Because of that, the catalyst surface interacts with alkali and earth alkali metals carried out by the flue gas stream.…”

mentioning

confidence: 99%

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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“…At the same time co-firing of coal and biomass -the method used to reduce CO2 emissions -has a negative effect on the operation of the SCR catalyst placed in the front of dust collector because of alkali and alkaline earth elements present in biomass and, consequently, in the fly ash. It leads to deterioration of the catalyst by poisoning reaction centres [2]. Placing the catalyst downstream of the dust collector would therefore allow for more efficient operation and longer catalysts life.…”

Section: Introductionmentioning

confidence: 99%

The influence of the modification of acidic montmorillonites with polyacrylamide and copper deposition on SCR-NH3 catalytic performance

et al. 2017

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Abstract. The aim of this work was to study the influence of the modification of montmorillonites by carbonaceous and Al species as well as copper deposition. Commercial acid-treated montmorillonites, K5 and K30 (Sigma-Aldrich GmBH), were modified and used as catalysts in Selective Catalytic Reduction process of nitrogen oxides by ammonia. The characterisation was carried out by low-temperature nitrogen sorption, Fourier-transform-infrared spectroscopy and X-ray diffraction. Catalytic performance in SCR-NH3 of so-modified montmorillonites was compared under the following conditions: mass of catalyst: 200 g, flow 100 cm 3 /min, reaction mixture: 800 ppm NO, 800 ppm NH3, 3 % O2, and He. The modification with copper and polyacrylamide led to the increase in NO conversion. The studied catalysts showed low N2O formation.

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The influence of poisoning on the deactivation of DeNOx catalysts

Cited by 12 publications

References 42 publications

Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

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

The influence of the modification of acidic montmorillonites with polyacrylamide and copper deposition on SCR-NH3 catalytic performance

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