Improved activity and significant SO2 tolerance of samarium modified CeO2-TiO2 catalyst for NO selective catalytic reduction with NH3

Liu, Hao; Fan, Zhongxuan; Sun, Chuanzhi; Yu, Shengwen; Feng, Shuai; Wei, Chen; Chen, Dezhan; Tang, Changjin; Gao, Fei

doi:10.1016/j.apcatb.2018.12.001

Cited by 335 publications

(148 citation statements)

References 67 publications

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“…The aforementioned peaks manifested the generation of surface sulfate species. According to the literatures, the peaks in the range of 1150‐1200 cm ‐1 for the Ce‐containing samples were attributed to the bulk‐like sulfate species . Thus, the peak at 1181 cm ‐1 indicated the formation of bulk‐like sulfate species over the Ce/Ti sample surface .…”

Section: Resultsmentioning

confidence: 79%

“…In the case of Ce/Ti, the O 2 desorption profiles were observed over the wide temperature range from 50 °C to 800 °C. The α peak (~147 °C) was ascribed to the desorption of surface chemical adsorbed oxygen . The β peak (~480 °C) could be assigned to the desorption of chemically adsorbed O 2 ‐ and O ‐ species, originated from the surface oxygen defects .…”

Section: Resultsmentioning

confidence: 99%

“…Raman results further illuminated that the addition of Co promoted the dispersion of CeO 2 particles on catalyst surface and well dispersed CeO 2 and Co 3 O 4 on catalyst surface could be obtained when the Co 3 O 4 /TiO 2 mass ratio was 0.3. This might enhance the interaction among active species/sites …”

Section: Resultsmentioning

confidence: 99%

“…The α peak (~147 °C) was ascribed to the desorption of surface chemical adsorbed oxygen . The β peak (~480 °C) could be assigned to the desorption of chemically adsorbed O 2 ‐ and O ‐ species, originated from the surface oxygen defects . Additionally, the γ peak (~650 °C) corresponded to the desorption of surface lattice oxygen .…”

Section: Resultsmentioning

confidence: 99%

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Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Zhang

Cao

et al. 2020

Applied Organom Chemis

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The Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation was used for efficient elemental mercury oxidation in flue gas. Results indicated that Co doping greatly enhanced the activity and SO2 resistance of the CeO2‐TiO2 catalyst. In the presence of 5% O2, 500 ppm NO, 800 ppm SO2 and 3% H2O at 200 °C, the Hg0 removal efficiency of CeCo3/Ti could maintain at about 87% for a relatively long time. Characterizations of catalysts (BET, XRD, Raman spectroscopy, TEM, H2‐TPR, O2‐TPD, XPS, TG‐MS and SO2‐DRIFTS) were carried out to reveal the mechanism of Co modification on the redox ability, SO2 resistance and resultant mercury oxidation removal performance of catalyst. It was found that an interaction of Ce with Co promoted the dispersion of CeO2, increased chemisorbed oxygen concentration, and improved the oxygen storage capacity and the reducibility of catalyst, which was beneficial to the improvement of Hg0 oxidation removal. Hg0 would adsorb onto the catalyst and react with surface active oxygen species replenished by gas‐phase O2 to be oxidized via Mars‐Maessen mechanism. SO2 consumed the surface active oxygen species and resulted in the reduction of Ce4+ to Ce3+, which induced the deactivation of catalyst. The introduced Co in CeO2‐TiO2 catalyst exerted the function of protecting Ce4+ from being poisoned by SO2 and thus promoted the sulfur resistance and Hg0 removal performance of the catalyst in the presence of SO2.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Zhang

Cao

et al. 2020

Applied Organom Chemis

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“…observed that Sm can improve the NH 3 −SCR performance of both Ce−Ti mixed oxides and TiO 2 /CeO 2 catalyst [25i,77] . The incorporation of Sm into Ce−Ti mixed oxides can improve the reducibility, oxygen storage capacity (OSC) and the ability of NO x adsorption and NH 3 activation (shown in Figure 9a), which enhances NH 3 −SCR activity; The redox cycles (Sm 2+ +Ce 4+ ⇌Sm 3+ +Ce 3+ ) can decrease the sulphation of catalyst via inhibiting the electron transferring from the adsorbed SO 2 to Ce 4+ , resulting in high SO 2 durability of Sm−Ce−Ti catalyst (Figure 9b) [25i] . For Sm modified TiO 2 /CeO 2 catalysts, doping of Sm into CeO 2 species can improve the adsorption of NH 3 and NO x on the catalyst surface by having a balance between surface redox properties and surface acidity, which increases the activity [77] .…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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Selective catalytic reduction of NOx with NH3 (NH3−SCR) is one of the widely used process to abate NOx emission from both stationary and mobile sources. Recently, CeO2−TiO2 based NH3−SCR catalysts due to their excellent medium and high temperature activities, high N2 selectivity and environmentally friendly, have attracted much attention as great candidate to replace the commercial VOx−TiO2 based NH3−SCR catalysts. During the past years, extensive works have been done to achieve the industrial commercialization of CeO2−TiO2 based NH3−SCR catalyst. In this review, we summarize the recent studies on the mechanism, deactivation, preparation and modification of CeO2−TiO2 catalyst. The focus of this review is the modification strategies on improving the catalytic performance of CeO2−TiO2 catalyst. By comparing the effect of different modification strategies on the catalytic performance of CeO2−TiO2 catalyst, the perspectives and challenges of CeO2−TiO2 based catalyst for NH3−SCR of NOx are discussed.

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Porous washcoat structure in CeO₂ modified Cu‐SSZ‐13 monolith catalyst for NH₃‐SCR with improved catalytic performance

et al. 2022

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A series of CeO2 modified Cu‐SSZ‐13 monolith catalysts were prepared by embedding CeO2 into the washcoat of Cu‐SSZ‐13 monolith catalyst through solvent combustion method. These CexCu‐SSZ‐13 catalysts were studied in the selective catalytic reduction (SCR) of NO with NH3, among which the Ce2Cu‐SSZ‐13 catalyst exhibited the best low‐temperature activity, hydrothermal stability, and sulfur resistance. The physicochemical properties of the catalysts were characterized using multiple methods. Results showed that the acidity, redox capacity, and ammonia adsorption capacity significantly enhanced after CeO2 modification, thus leading to the high performance of Ce2Cu‐SSZ‐13 catalyst. Furthermore, the introduction of CeO2 induced the fast SCR reaction by promoting the oxidation of NO to NO2. Analog calculation suggested that the porous structure generated via solvent combustion in the washcoat effectively increased the diffusion rate of reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFT) analysis showed that Brønsted acid sites were the main active center and the reaction followed Eley–Rideal mechanism.

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Improved activity and significant SO2 tolerance of samarium modified CeO2-TiO2 catalyst for NO selective catalytic reduction with NH3

Cited by 335 publications

References 67 publications

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Porous washcoat structure in CeO₂ modified Cu‐SSZ‐13 monolith catalyst for NH₃‐SCR with improved catalytic performance

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Improved activity and significant SO2 tolerance of samarium modified CeO2-TiO2 catalyst for NO selective catalytic reduction with NH3

Cited by 335 publications

References 67 publications

Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Porous washcoat structure in CeO2 modified Cu‐SSZ‐13 monolith catalyst for NH3‐SCR with improved catalytic performance

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Product

Resources

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Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Porous washcoat structure in CeO₂ modified Cu‐SSZ‐13 monolith catalyst for NH₃‐SCR with improved catalytic performance