Synthesis of bulk vanadium oxide with a large surface area using organic acids and its low-temperature NH3-SCR activity

Inomata, Yusuke; Hata, Shinichi; Kiyonaga, Eiji; Morita, Keiichiro; Yoshida, Kazuhiro; Haruta, Masatake; Murayama, Toru

doi:10.1016/j.cattod.2020.06.041

Cited by 19 publications

(11 citation statements)

References 42 publications

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“…We previously showed that vanadium oxide with a bulk crystal structure works as an NH 3 -SCR catalyst at a low temperature (<150°C) with high N 2 selectivity and less SO 2 oxidation activity in contrast to the supported vanadia species 18,19 . Recent studies provided an insight into the effect of the coordination environment, atomic configuration, and vanadium surface density of the catalyst on SCR activity [20][21][22] .…”

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Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

et al. 2021

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NH3-SCR (selective catalytic reduction) is important process for removal of NOx. However, water vapor included in exhaust gases critically inhibits the reaction in a low temperature range. Here, we report bulk W-substituted vanadium oxide catalysts for NH3-SCR at a low temperature (100–150 °C) and in the presence of water (~20 vol%). The 3.5 mol% W-substituted vanadium oxide shows >99% (dry) and ~93% (wet, 5–20 vol% water) NO conversion at 150 °C (250 ppm NO, 250 ppm NH3, 4% O2, SV = 40000 mL h−1 gcat−1). Lewis acid sites of W-substituted vanadium oxide are converted to Brønsted acid sites under a wet condition while the distribution of Brønsted and Lewis acid sites does not change without tungsten. NH4+ species adsorbed on Brønsted acid sites react with NO accompanied by the reduction of V5+ sites at 150 °C. The high redox ability and reactivity of Brønsted acid sites are observed for bulk W-substituted vanadium oxide at a low temperature in the presence of water, and thus the catalytic cycle is less affected by water vapor.

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Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

et al. 2021

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“…Of course, compared to the nice low‐temperature and stable SCR activity of oxide catalysts, such as CeO x or MnO x or VO x on TiO 2 carrier, [47] MIL‐88B(V) had limited high‐temperature stability which the structure changed when the reaction conditions exceed 300 °C and the SCR stable conversion window was relatively narrow. Nevertheless, because MIL‐88B(V) had high SCR reaction selectivity and not bad medium temperature SCR catalytic performance, it can still have application prospects in industrial denitration at medium and low temperatures for industrial kilns and other non‐electric industries, and provided some reference information for the expansion and application research of MOFs materials in the catalytic elimination of pollutants and the material synthesis improvement.…”

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confidence: 99%

Catalytic Performance of MIL‐88B(V) and MIL‐101(V) MOFs for the Selective Catalytic Reduction of NO with NH₃

Zhai

Wei

et al. 2020

ChemCatChem

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In this paper, the SCR properties of MIL‐88B(V) and MIL‐101(V) MOFs materials by hydrothermal synthesis were investigated, and the effect of the coordination and spatial topology of MOFs materials on the coordination state, chemical state and surface properties of V ions, as well as the relationship with SCR catalysis, were discussed. The results showed that the NO conversion of MIL‐88B(V) can be as high as 80 %, while those of MIL‐101(V) can only reach to 20 %, but the SCR reaction selectivity of both were excellent. The coordination structure and spatial topological structure of MOFs materials had a great influence on the coordination state, chemical state and surface properties of V ions, resulting in different SCR catalytic performance. The reaction performance of SCR was related to the structural properties of V3Ox units and followed the E‐R mechanism. The staggered and layer upon layer close‐packed structure of MIL‐88B(V) made the density of V3Ox unit cluster higher and the distance of adjacent V3Ox unit cluster smaller. More V5+ ions and V−O−V bonds can form more Brønsted acid sites, also was conducive to the progress of the SCR reaction. Although MIL‐88B(V) has insufficient high temperature stability, but its good SCR reaction selectivity and SCR catalytic performance at medium and low temperature can still have the application prospect of medium and low temperature industrial denitration in non‐electric industries.

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“…The catalysts used in these applications are copper or iron zeolites 31,32 or vanadium oxide materials. 33 The reduction reaction of NO x with NH 3 can take place according to the standard (1), fast (2), or NO 2 SCR (3) reaction, depending on the NO/NO 2 ratio in the gas stream. 34…”

Section: ■ Examples Of Research Projects Example 1: Carbohydrate Cata...mentioning

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“…In mobile applications such as transport vehicles, the NH 3 is generated by the decomposition of urea which is injected as a 32 wt % aqueous solution into the hot exhaust gas stream. , By doing so the urea is decomposed via pyrolysis and hydrolysis reactions. The catalysts used in these applications are copper or iron zeolites , or vanadium oxide materials . The reduction reaction of NO x with NH 3 can take place according to the standard (1), fast (2), or NO 2 SCR (3) reaction, depending on the NO/NO 2 ratio in the gas stream …”

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Developing a Catalysis Applied Research Community at a University of Applied Sciences: From Educational Setting to High-Quality Research Output

et al. 2021

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In this report we present a method to incorporate applied catalysis research into the multiyear educational undergraduate program of Chemical Engineering at the Rotterdam University of Applied Sciences (UAS). In this way the total student population is introduced to research and thereby contributes to the scientific output of the department, and more students can potentially be encouraged to follow a research career. We discuss the challenges of performing high-level research at a UAS in comparison to dedicated research universities and possible opportunities to make high-level applied research work. The time available to conduct research is a challenge. However, by introducing the research into educational programs the issue of time can be relieved. From our experience, the key factor to gain high-level scientific research output is to let well trained research-lecturers work closely with students in scaffolded projects as has been shown by the publication of several papers in peer reviewed scientific international journals. We also highlight two research projects on carbohydrate catalysis for the production of high-value chemicals and improving the efficiency of selective catalytic reduction systems.

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Synthesis of bulk vanadium oxide with a large surface area using organic acids and its low-temperature NH3-SCR activity

Cited by 19 publications

References 42 publications

Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

Catalytic Performance of MIL‐88B(V) and MIL‐101(V) MOFs for the Selective Catalytic Reduction of NO with NH₃

Developing a Catalysis Applied Research Community at a University of Applied Sciences: From Educational Setting to High-Quality Research Output

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Synthesis of bulk vanadium oxide with a large surface area using organic acids and its low-temperature NH3-SCR activity

Cited by 19 publications

References 42 publications

Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

Catalytic Performance of MIL‐88B(V) and MIL‐101(V) MOFs for the Selective Catalytic Reduction of NO with NH3

Developing a Catalysis Applied Research Community at a University of Applied Sciences: From Educational Setting to High-Quality Research Output

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Product

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Catalytic Performance of MIL‐88B(V) and MIL‐101(V) MOFs for the Selective Catalytic Reduction of NO with NH₃