Dual resistance to alkali metals and SO<sub>2</sub>: vanadium and cerium supported on sulfated zirconia as an efficient catalyst for NH<sub>3</sub>-SCR

Gao, Shan; Wang, Penglu; Yu, Feixiang; Wang, Haiqiang; Wu, Zhongbiao

doi:10.1039/c6cy01502f

Cited by 45 publications

(31 citation statements)

References 74 publications

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“…The bands at 606 cm −1 and 515 cm −1 can be attributed to the Fg2 symmetry mode and the peak at 472 cm −1 corresponds to the Eg mode [30][31][32][33]. The spectrum of the CeO2 was associated with one intense peak at 465 cm −1 , which can be assigned to the symmetric O-Ce-O stretching mode of CeO2 [34][35][36]. In addition, two weak bands can be found at around 263 cm −1 and 612 cm −1 .…”

Section: Characterizationmentioning

confidence: 97%

“…Based on these results and earlier studies [47,48], it can be proven that a mixed oxide of Co2AlO4 was formed. In the case of CoAlCe, the peak at 456 cm −1 appears due to the symmetric O-Ce-O stretching mode (F2g) of CeO2 [34,35]. Shyu et al [37] observed the appearance of peaks at 250, 268, 288, 383, 558, 623, 739, 772 and 840 cm −1 for CeO2/Al2O3.…”

Section: Characterizationmentioning

confidence: 99%

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On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

et al. 2020

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Contaminated methanol has very good potential for being utilized in formaldehyde production instead of its destructive abatement. The activities, selectivities and stabilities of cobalt–alumina and cobalt–alumina–ceria catalysts prepared by the hydrotalcite-method were investigated in formaldehyde production from emissions of methanol and methanethiol. Catalysts were thoroughly characterized and the relationships between the characterization results and the catalytic performances were drawn. The preparation method used led to the formation of spinel-type structures in the form of Co2AlO4 based on x-ray diffraction (XRD) and Raman spectroscopy. Ceria seems to be present as CeO2, even though interaction with alumina is possible in the fresh catalyst. The same structure is maintained after pelletizing the cobalt–alumina–ceria catalyst. The cobalt–alumina–ceria catalyst was slightly better in formaldehyde production, probably due to lower redox temperatures and higher amounts of acidity and basicity. Methanol conversion is negatively affected by the presence of methanethiol; however, formaldehyde yields are improved. The stability of the pelletized catalyst was promising based on a 16 h experiment. During the experiment, cobalt was oxidized (Co2+ → Co3+), cerium was reduced (Ce4+ → Ce3+) and sulfates were formed, especially on the outer surface of the pellet. These changes affected the low temperature performance of the catalyst; however, the formaldehyde yield was unchanged.

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Section: Characterizationmentioning

confidence: 97%

Section: Characterizationmentioning

confidence: 99%

On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

et al. 2020

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“…[53] Several bands at 1419, 1374, 1360, 1343 and 1109 cm À 1 are detected after 20 min. The peaks at 1419 and 1109 cm À 1 are attributed to tridentate sulfates and bulk-like sulfate species, [7,55] respectively. Above results shows that the bands at 1300-1400 cm À 1 of 10 %MnO x À CeO 2 /P-CA attributed to sulfate species emerge earlier and are much stronger than that of 10 %MnO x À CeO 2 /CA.…”

Section: Samplesmentioning

confidence: 99%

Promotion of Phosphorus on Carbon Supports for MnO_x−CeO₂ Catalysts in Low‐Temperature NH₃−SCR with Enhanced SO₂ Resistance

Yang

Jin

et al. 2021

ChemistrySelect

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MnOx−CeO2/P‐CA catalysts were prepared via incipient wetness impregnation of Mn(NO3)2 ⋅ 4H2O and Ce(NO3)3 ⋅ 6H2O over phosphorus‐doped carbon aerogels (P‐CA) for selective catalytic reduction of NO by NH3 (NH3−SCR). The results show that P doping on carbon support significantly promotes the NH3−SCR performance of MnOx−CeO2/P‐CA catalysts. P modification can improve the hydrophilicity of carbon support and facilitate the dispersion of MnOx−CeO2 components on carbon surface, which enhances the electronic interactions between MnOx and CeO2. The optimal catalyst 10 %MnOx−CeO2/P‐CA shows higher surface acidity, more Mn4+ and Ce3+, and a larger amount of surface chemisorbed oxygen (Oα) than that of 10 %MnOx−CeO2/CA catalyst. As a result, even though in the company of SO2, more NO can be adsorbed and oxidized over the 10 %MnOx−CeO2/P‐CA catalyst to generate more NO complexes, alleviating the suppression of SO2 on the SCR reaction via Langmuir‐Hinshelwood (L−H) mechanism, and thus the SO2 resistance is enhanced.

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“…The catalyst has better resistance to SO 2 , H 2 O, and alkali metal than the vanadium-based commercial catalyst. Gao et al [52] used sulfided zirconia as a catalyst support and added Ce:V = 1:1 to obtain a CeVSZ(x) catalyst. The support provides too many acidic sites to react with the alkali metal and delay the acidity reduction.…”

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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Dual resistance to alkali metals and SO₂: vanadium and cerium supported on sulfated zirconia as an efficient catalyst for NH₃-SCR

Abstract: Vanadium and cerium supported on sulfated zirconia is an efficient SCR catalyst with dual resistance toward both potassium and SO2 poisoning.

Cited by 45 publications

References 74 publications

On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

Promotion of Phosphorus on Carbon Supports for MnO_x−CeO₂ Catalysts in Low‐Temperature NH₃−SCR with Enhanced SO₂ Resistance

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

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Dual resistance to alkali metals and SO2: vanadium and cerium supported on sulfated zirconia as an efficient catalyst for NH3-SCR

Abstract: Vanadium and cerium supported on sulfated zirconia is an efficient SCR catalyst with dual resistance toward both potassium and SO2 poisoning.

Cited by 45 publications

References 74 publications

On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions

Promotion of Phosphorus on Carbon Supports for MnOx−CeO2 Catalysts in Low‐Temperature NH3−SCR with Enhanced SO2 Resistance

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

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Resources

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Dual resistance to alkali metals and SO₂: vanadium and cerium supported on sulfated zirconia as an efficient catalyst for NH₃-SCR

Promotion of Phosphorus on Carbon Supports for MnO_x−CeO₂ Catalysts in Low‐Temperature NH₃−SCR with Enhanced SO₂ Resistance