New insights into the deactivation mechanism of V2O5-WO3/TiO2 catalyst during selective catalytic reduction of NO with NH3: synergies between arsenic and potassium species

Li, Lin; Chen, Lin; Kong, Ming; Liu, Qingcai; Ren, Shan

doi:10.1039/c9ra07545c

Cited by 20 publications

(8 citation statements)

References 43 publications

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Section: Mechanism Of Alkali Metal Poisoning On Scr Catalystmentioning

confidence: 99%

Alkali Metal Poisoning and Regeneration of Selective Catalytic Reduction Denitration Catalysts: Recent Advances and Future Perspectives

Tang

et al. 2022

Energy Fuels

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NO x produced by various combustion devices can cause serious harm to the environment and human health. Selective catalytic reduction (SCR) denitration technology is the most widely used postcombustion denitrification technology due to its high denitration efficiency, mature technology, and no harmful products. However, the alkali metals (e.g., K, Na, Ca, Mg) in combustion flue gas can poison the SCR catalyst, resulting in catalyst deactivation and deterioration of the SCR denitration system. Therefore, studying the alkali metal poisoning mechanism and antipoisoning measures of the SCR catalyst is crucial for increasing the service life of a catalyst and reducing the operation cost of a SCR denitration system. In this review, the research advances in the poisoning mechanisms of alkali metals for SCR catalysts (mainly including vanadium-based catalysts, manganese-based catalysts, copper-based catalysts, cerium-based catalysts, iron-based catalysts) were reviewed systematically. Various antialkali metal poisoning measures and mechanisms (e.g., doping metals and nonmetals, using appropriate supports, designing novel structures) were summarized. In addition, some regeneration measures for alkali metal poisoning SCR catalysts were also commented on. The results demonstrate that the deposits of alkali metals on SCR catalysts can reduce the specific surface area and pore volume of the catalyst and also destroy the active sites on the catalyst surface, which eventually lead to poisoning of the catalyst. The doping of the catalyst with other elements, rational design of catalyst structures, and effective use of catalyst supports can effectively improve the antipoisoning ability of the SCR catalyst. Water washing, acid washing, and electrophoresis treatment are some common methods for the regeneration of alkali-poisoned catalysts.

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Section: Mechanism Of Alkali Metal Poisoning On Scr Catalystmentioning

confidence: 99%

Alkali Metal Poisoning and Regeneration of Selective Catalytic Reduction Denitration Catalysts: Recent Advances and Future Perspectives

Tang

et al. 2022

Energy Fuels

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“…Synergetic poisoning effect of arsenic with potassium was evaluated in [185,186]. Results indicated that the coeffect of As + K was more dramatic than the additive effect of a single poison.…”

Section: Arsenic Poisoningmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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“…Two new peaks appeared at 940.5 and 1116.3 cm –1 at 25 and 40 °C; the former was assigned to the presence of As–O from the arsenic oxide product, 35 and the latter was assigned to the bonds of the Lewis (L) acid sites. 36 O 2 may participate in the chemical adsorption of hydrogen arsenide by adsorbing at L acid sites on the surface of Cu/Ac to convert to O β . 33 This indicated that a chemical adsorption process mainly occurred on the Cu/AC surface when the reaction temperature was 25 and 40 °C.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Role of Copper Species-Modified Active Carbon by Low-Temperature Roasting on the Improvement of Arsine Adsorption

Chen¹,

Feng

Xie

et al. 2022

ACS Omega

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Traditional adsorbents undershot the expectations for arsine (AsH 3 ) removal under low-temperature operation conditions in the industry. In this study, the copper (Cu) precursor was used to modify activated carbon and yield novel adsorbents by low-temperature roasting for high-efficiency removal of AsH 3 . The best conditions were determined as impregnation with 2 mol/L Cu(NO 3 ) 2 adsorbent and roasting at 180 °C. At a reaction temperature of 40 °C and an oxygen content of 1%, the AsH 3 removal efficiency reached over 90% and lasted for 40 h and the best capacity of 369.6 mg/g was obtained with the Cu/Ac adsorbent. The characterization results showed the decomposition of Cu(NO 3 ) 2 during the low-temperature roasting process to form surface functional groups. The formation of the important intermediate Cu 2 (NO 3 )(OH) 3 in the decomposition of Cu(NO 3 ) 2 into CuO plays a role in the good regeneration performance of the Cu/Ac adsorbent using water washing and the gas regeneration method. The results of in situ diffuse reflectance infrared Fourier transform spectroscopy combined with X-ray photoelectron spectroscopy demonstrated that the interaction of trace oxygen with Lewis (L) acid sites increased chemisorbed oxygen by 17.34%, significantly promoting the spontaneity of AsH 3 oxidation reaction. These results provide a friendly economic method with industrial processes practical for AsH 3 removal.

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New insights into the deactivation mechanism of V₂O₅-WO₃/TiO₂ catalyst during selective catalytic reduction of NO with NH₃: synergies between arsenic and potassium species

Abstract: Synergies between arsenic (As) and potassium (K) species in the deactivation of V2O5-WO3/TiO2 catalyst were investigated.

Cited by 20 publications

References 43 publications

Alkali Metal Poisoning and Regeneration of Selective Catalytic Reduction Denitration Catalysts: Recent Advances and Future Perspectives

Alkali Metal Poisoning and Regeneration of Selective Catalytic Reduction Denitration Catalysts: Recent Advances and Future Perspectives

Tungsten-Based Catalysts for Environmental Applications

Investigation of the Role of Copper Species-Modified Active Carbon by Low-Temperature Roasting on the Improvement of Arsine Adsorption

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