Exploration of surface properties of Sb-promoted copper vanadate catalysts for selective catalytic reduction of NOX by NH3

Kim, Jongsik; Kwon, Dong Wook; Lee, Somin; Ha, Heon Phil

doi:10.1016/j.apcatb.2018.05.024

Cited by 61 publications

(61 citation statements)

References 73 publications

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“…Sample Co and Mo had higher NO x conversion rates than sample V and W would be because of the stronger interaction of Co/Mo with Mn/Ce to form multi‐metallic oxides. The Metal‐Oxygen‐Metal (M‐O‐M) linkage in a multi‐metallic oxides lead to sufficient surface defects for the adsorp/activation of the NO and NH 3 . It was reported that Mo depressed NH 3 desoption from acid sites, modified surface acidity, promoted NH 3 oxidation but decreased N 2 selectivity .…”

Section: Resultsmentioning

confidence: 99%

“…The Metal-Oxygen-Metal (M-O-M) linkage in a multi-metallic oxides lead to sufficient surface defects for the adsorp/activation of the NO and NH 3 . 41 It was reported that Mo depressed NH 3 desoption from acid sites, modified surface acidity, promoted NH 3 oxidation but decreased N 2 selectivity. 26 Researches using MoO 3 dopped Ce Zr and Mn Zr oxides for NH 3 -SCR found that MoO 3 could improve activity, change redox property and increase surface acidity.…”

Section: Resultsmentioning

confidence: 99%

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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“…The O=WO 4 site enhances the surface acidity of the catalyst and promotes the adsorption of NH 3 [12]. Tungsten oxide as a promoter has two primary roles in catalysis: it restrains the generation of bulk polymeric V aggregates and retains Brønsted acid sites at high temperatures [21]. …”

Section: Nh3-scr Reaction Mechanism Of Vanadium-based Catalystmentioning

confidence: 99%

“…By introducing copper species, strong acid sites are increased. It is worth noting that Lewis acid sites are the strong acid sites in Cu–V/TiO 2 catalyst [21,41]. …”

Section: Performance Improvement Of Vanadium Based Catalystsmentioning

confidence: 99%

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Zhang

Chen

et al. 2018

Materials

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Selective catalytic reduction of NOx with NH3 is one of the most widely used technologies in denitration. Vanadium-based catalysts have been extensively studied for the deNOx process. V2O5/WO3(MoO3)TiO2 as a commercial catalyst has excellent catalytic activity in the medium temperature range. However, it has usually faced several problems in practical industrial applications, including narrow windows of operation temperatures, and the deactivation of catalysts. The modification of vanadium-based catalysts will be the focus in future research. In this paper, the chemical composition of vanadium-based catalysts, catalytic mechanism, the broadening of the temperature range, and the improvement of erosion resistance are reviewed. Furthermore, the effects of four major systems of copper, iron, cerium and manganese on the modification of vanadium-based catalysts are introduced and analyzed. It is worth noting that the addition of modified elements as promoters has greatly improved the catalytic performance. They can enhance the surface acidity, which leads to the increasing adsorption capacity of NH3. Surface defects and oxygen vacancies have also been increased, resulting in more active sites. Finally, the future development of vanadium-based catalysts for denitration is prospected. It is indicated that the main purpose for the research of vanadium-based modification will help to obtain safe, environmentally friendly, efficient, and economical catalysts.

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“…34 Among metal vanadates, copper vanadates are suitable photocatalysts due to their narrow band gap (B2 eV), strong response to visible light, excellent catalytic properties and environmental benignity. Depending on the different preparation methods and molar ratio of CuO and V 2 O 5 , different crystal phases such as CuV 2 O 6 , [35][36][37] Cu 2 V 2 O 7 , 38 Cu 3 V 2 O 8 , and Cu 5 V 2 O 10 39 can be obtained according to the coordination of vanadium in a square pyramid or tetrahedron, 24,40 as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Phase-dependent photocatalytic selective oxidation of cyclohexane over copper vanadates

et al. 2022

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Exploration of surface properties of Sb-promoted copper vanadate catalysts for selective catalytic reduction of NOX by NH3

Cited by 61 publications

References 73 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Phase-dependent photocatalytic selective oxidation of cyclohexane over copper vanadates

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Exploration of surface properties of Sb-promoted copper vanadate catalysts for selective catalytic reduction of NOX by NH3

Cited by 61 publications

References 73 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Research Status and Prospect on Vanadium-Based Catalysts for NH3-SCR Denitration

Phase-dependent photocatalytic selective oxidation of cyclohexane over copper vanadates

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Product

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR