The promotion effect of copper doping on the potassium resistance of V/TiO2 catalyst for selective catalytic reduction of NO with NH3

Wang, Peng

doi:10.1007/s11696-017-0219-3

Cited by 9 publications

(5 citation statements)

References 52 publications

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“…Some results ,, showed that the doping of Cu 2+ into SCR catalysts could substantively improve its alkali-poisoning resistance. Kang et al analyzed the influence of CuO doping on the anti-K poisoning ability of CeTiO x catalysts.…”

Section: Antipoisoning Measuresmentioning

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: Antipoisoning Measuresmentioning

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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“…Recently, the doping of transition metal elements such as Mo [10], Fe [11], Mn [12], Cr [13], V [14], and Ni [15] have been investigated for the purpose of enhancing the photocatalytic efficiency of TiO 2 . Wu et al [11] prepared Fe-TiO 2 nanotubes with the ultrasonic impregnation-calcination method.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Xue

Luo

et al. 2020

Coatings

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Mo-doped TiO2 nanotube arrays are prepared successfully by a combined method of direct current (DC) magnetron sputtering and anodic oxidation. The doping amount of Mo can be modified by changing the number of molybdenum blocks on the Ti target while a Ti–Mo alloy film is prepared by magnetron sputtering on a metal Ti substrate, following a Mo-doped TiO2 nanotube array grown by anodization. Morphology test shows that the doping of Mo could inhibit the phase transition and growth of crystal of TiO2. X-ray photoelectron spectroscopy (XPS) results show that Mo has successfully been embedded in the TiO2 crystal lattice and mainly exists in the valence states of Mo6+. Mo-doping samples show slightly increased visible light absorption as the red shift of TiO2 absorption edge with the band gap dropping from 3.24 to 3.16 eV with 0.5 at.% Mo doping. The enhanced photocurrent is demonstrated for a 0.5 at.% Mo-doped TiO2 electrode. Through photoelectric performance testing under UV-visible light irradiation, the nanotube array film with a Mo-doped content of 0.5% produced the maximum photocurrent density, which is about four times the undoped TiO2 nanotube array film, exhibiting a considerable photoelectric effect gain. The controllable Mo doping TiO2 nanotube array film prepared by this combining technique is expected as a promising material for efficient applications in photoelectric conversion.

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“…In the sections above, we discussed the structure of VO x loaded on TiO 2 /SBA-15 and several aspects affecting the NH 3 -SCR activity. Compared to previous VO x -based model systems with similar V loading on SiO 2 , TiO 2 , or SiO 2 + TiO 2 prepared by other techniques, our VO x /TiO 2 /SBA-15 catalyst shows an improved NO x conversion and operation window [5,[119][120][121]. For NH 3 -SCR over supported VO x catalysts, high reactivity has been related to crystalline (anatase) TiO 2 [5,122,123].…”

Section: Structure-activity Relationshipmentioning

confidence: 75%

High Surface Area VOx/TiO2/SBA-15 Model Catalysts for Ammonia SCR Prepared by Atomic Layer Deposition

Shen

Heß

2020

Catalysts

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The mode of operation of titania-supported vanadia (VOx) catalysts for NOx abatement using ammonia selective catalytic reduction (NH3-SCR) is still vigorously debated. We introduce a new high surface area VOx/TiO2/SBA-15 model catalyst system based on mesoporous silica SBA-15 making use of atomic layer deposition (ALD) for controlled synthesis of titania and vanadia multilayers. The bulk and surface structure is characterized by X-ray diffraction (XRD), UV-vis and Raman spectroscopy, as well as X-ray photoelectron spectroscopy (XPS), revealing the presence of dispersed surface VOx species on amorphous TiO2 domains on SBA-15, forming hybrid Si–O–V and Ti–O–V linkages. Temperature-dependent analysis of the ammonia SCR catalytic activity reveals NOx conversion levels of up to ~60%. In situ and operando diffuse reflection IR Fourier transform (DRIFT) spectroscopy shows N–Hstretching modes, representing adsorbed ammonia and -NH2 and -NH intermediate structures on Bronsted and Lewis acid sites. Partial Lewis acid sites with adjacent redox sites are proposed as the active sites and desorption of product molecules as the rate-determining step at low temperature. The high NOx conversion is attributed to the presence of highly dispersed VOx species and the moderate acidity of VOx supported on TiO2/SBA-15.

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The promotion effect of copper doping on the potassium resistance of V/TiO2 catalyst for selective catalytic reduction of NO with NH3

Cited by 9 publications

References 52 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

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

High Surface Area VOx/TiO2/SBA-15 Model Catalysts for Ammonia SCR Prepared by Atomic Layer Deposition

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