Effect of Cu doping on the SCR activity over the CumCe0.1-mTiOx (m = 0.01, 0.02 and 0.03) catalysts

Zhang, Tianrui; Ma, Shibo; Chen, Liqiang; Li, Rui; Leng, Xuesong; Li, Yushi; Yuan, Fang; Niu, Xiaoyu; Zhu, Yujun

doi:10.1016/j.apcata.2018.11.025

Cited by 37 publications

(6 citation statements)

References 67 publications

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“…The hardly changed peak position of V 5+ to V 3+ reduction implied that sulfur poisoning did not cause severe impact to the redox property of the VW/Ti-p catalyst. On FeW/Ti, , MnW/Ti, , and CuW/Ti, , it is evident that the first reduction peak was stronger and shifted to higher temperatures. The increase of peak intensity was due to the coupled reduction of metal and sulfate species, which resulted in the increase of H 2 consumption and does not indicate the improvement of the oxidation capacity of the catalyst.…”

Section: Resultsmentioning

confidence: 96%

“…Selective catalytic reduction (SCR) was an efficient NO x elimination technology. − The most widely used industrial catalyst is V 2 O 5 –WO 3 (MoO 3 )/TiO 2 . However, because of some inevitable disadvantages of practical applications, such as the narrow operating temperature window, high conversion of SO 2 to SO 3 , and the toxicity of vanadium pentoxide, , many researchers focused on the development of new vanadium-free SCR catalysts. Elements including manganese (Mn), iron (Fe), cerium (Ce), and copper (Cu) have received attention because of their excellent catalytic performance for NO x removal recently .…”

Section: Introductionmentioning

confidence: 99%

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Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Wang

Wen

et al. 2020

Environ. Sci. Technol.

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In this study, the sulfur resistance and thermal regeneration of a series of MO x −WO 3 /TiO 2 (denoted as MW/Ti, M = Fe, Mn, Cu, V) catalysts were investigated. After in situ sulfur poisoning, the selective catalytic reduction (SCR) activity of the poisoned catalysts was inhibited at low temperatures but was promoted at high temperatures. After thermal regeneration, the FeW/Ti catalyst was more thoroughly regenerated among nonvanadium-based catalysts. To investigate the impacts of sulfur poisoning, characterizations including X-ray diffraction, thermogravimetric analysis, H 2 temperature-programmed reduction, and SO 2 temperatureprogrammed desorption were applied. It was discovered that different sulfur-containing species blocked the adsorption of NH 3 /NO to a distinct extent over all of the catalysts, thus affecting the catalytic activity. The effect depends on which are dominant (NO or NH 3 ) during the reaction at different temperatures. The difference in regeneration depends on the formation of sulfate species. The ratio of M x (SO 4 ) y to NH 4 HSO 4 generated on the catalysts was adopted to assess the possibility of regeneration. The ratios were 0.5, 1.4, 1.5, and 1.7 for VW/Ti, FeW/Ti, CuW/Ti, and MnW/Ti catalysts, respectively. The lower the ratio was, the easier the catalyst could be regenerated. Meanwhile, the sulfate species could be decomposed more easily on the poisoned FeW/Ti catalyst. FeW/Ti is an excellent candidate for low-and medium-temperature NH 3 -SCR among nonvanadium-based catalysts.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Wang

Wen

et al. 2020

Environ. Sci. Technol.

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“…As shown in Figure b, for the CMT-3DOM catalyst, the peak located at 1620 cm –1 belonged to the adsorption of gaseous NO 2 , and that at 1565, 1276 cm –1 both corresponded to monodentate nitrate . The bands at 1251 cm –1 were assigned to bridged nitrate . The peak at 1276 and 1620 cm –1 belonged to monodentate nitrate and gaseous NO 2 molecules both became weaker after Cd, Pb, and Zn poisoning, in which the monodentate nitrate and NO 2 molecules were the key components in the “fast-SCR” reaction. , The decrease in the adsorption amount of monodentate nitrate and NO 2 molecules could obviously decrease the catalytic performance of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Poisoning Mechanism Study of Metal Ions on a Three-Dimensional Ordered Macroporous Structure Ce_0.2Mn_0.2/3DOM-TiO₂ Catalyst for Low-Temperature SCR of NO with NH₃

Tan,

Shen,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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Metallic ions such as Cd, Pb, and Zn are commonly present in nonelectric industry flue gas, resulting in catalyst poisoning and deactivation, thereby hampering the use of SCR technology for flue gas treatment in nonelectric industries. In this paper, the catalyst with a three-dimensional ordered macrophage (3DOM) structure support was prepared to enhance its antipoisoning performance. Additionally, the possible mechanism of catalyst metal ion poisoning was investigated. The XPS results revealed a significant decrease in the catalyst's chemisorbed oxygen content after Cd and Pb poisoning. The NH 3 -TPD analysis indicated a decrease in the acid sites present on the catalyst's surface and a weakening of its redox capacity after Cd poisoning, which led to a degradation of the SCR performance over the CMT--3DOM catalyst. In situ DRIFTS experiments manifested that SCR progression on the CMT-3DOM catalyst followed both L-H and E-R mechanisms. Cd-poisoned catalysts primarily followed the L-H mechanism, while on Pb-and Zn-poisoned catalysts, the E-R mechanism dominated.

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“… [63] Thus, Cu modified CeO 2 −TiO 2 catalyst exhibits a superior low temperature NH 3 −SCR activity in all of the reported studies [25e,63,64] . However, the drawback is that it also causes non‐selective oxidation of NH 3 [63,64b–d] . Accordingly, Cu addition can decrease the catalytic activity at higher temperature [25e,63,64] .…”

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

confidence: 92%

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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Effect of Cu doping on the SCR activity over the CumCe0.1-mTiOx (m = 0.01, 0.02 and 0.03) catalysts

Cited by 37 publications

References 67 publications

Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Poisoning Mechanism Study of Metal Ions on a Three-Dimensional Ordered Macroporous Structure Ce_0.2Mn_0.2/3DOM-TiO₂ Catalyst for Low-Temperature SCR of NO with NH₃

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

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Effect of Cu doping on the SCR activity over the CumCe0.1-mTiOx (m = 0.01, 0.02 and 0.03) catalysts

Cited by 37 publications

References 67 publications

Novel Methods for Assessing the SO2 Poisoning Effect and Thermal Regeneration Possibility of MOx–WO3/TiO2 (M = Fe, Mn, Cu, and V) Catalysts for NH3-SCR

Novel Methods for Assessing the SO2 Poisoning Effect and Thermal Regeneration Possibility of MOx–WO3/TiO2 (M = Fe, Mn, Cu, and V) Catalysts for NH3-SCR

Poisoning Mechanism Study of Metal Ions on a Three-Dimensional Ordered Macroporous Structure Ce0.2Mn0.2/3DOM-TiO2 Catalyst for Low-Temperature SCR of NO with NH3

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

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Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Novel Methods for Assessing the SO₂ Poisoning Effect and Thermal Regeneration Possibility of MO_x–WO₃/TiO₂ (M = Fe, Mn, Cu, and V) Catalysts for NH₃-SCR

Poisoning Mechanism Study of Metal Ions on a Three-Dimensional Ordered Macroporous Structure Ce_0.2Mn_0.2/3DOM-TiO₂ Catalyst for Low-Temperature SCR of NO with NH₃

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