Excellent low-temperature NH3-SCR NO removal performance and enhanced H2O resistance by Ce addition over the Cu0.02Fe0.2CeyTi1-yOx (y = 0.1, 0.2, 0.3) catalysts

Ma, Shibo; Tan, Huansheng; Li, Yushi; Wang, Peiqiang; Zhao, Chen; Niu, Xiaoyu; Zhu, Yujun

doi:10.1016/j.chemosphere.2019.125309

Cited by 68 publications

(24 citation statements)

References 40 publications

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“…For the fresh catalyst, the Raman peaks at 141, 196, 396, 515 and 639 cm À1 could be observed and are ascribed to the anatase TiO 2 . [31][32][33] Besides these, an obvious peak at 464 cm À1 can be detected over the fresh catalyst, which may be assigned to the F 2g vibration modes of CeO 2 . 34,35 Furthermore, no characteristic Raman peaks of Fe oxide species are observed over the fresh catalyst, indicating the Fe oxide species exist as amorphous structure or are dispersed well on the TiO 2 support's surface.…”

Section: Results Of Raman Analysismentioning

confidence: 95%

Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

et al. 2020

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Section: Results Of Raman Analysismentioning

confidence: 95%

Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

et al. 2020

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“…However, these catalysts are unsatisfactory due to vanadium toxicity, poor low-temperature activity, and generation of N 2 O at high-temperature. [14][15][16] Various metal containing zeolite catalysts, especially Cu-zeolite catalysts, have exhibited high N 2 selectivity and high de-NO x performance at low temperatures. 10,13,17 However, these catalysts have disadvantages such as poor resistance at high temperatures and deactivation in the presence of water vapor.…”

Section: Introductionmentioning

confidence: 99%

“…21 Cerium is widely used in SCR catalysts due to acidity and high oxygen storage capacity. 14 However, pure CeO 2 has poor activity. Thus, some metals-doped Ce Ti catalysts such as CeO 2 -MnO x , CeO 2 -Fe 2 O 3 , CeO 2 -CuO, CeO 2 -Al 2 O 3 , and CeO 2 -TiO 2 catalysts have been investigated to enhance the activity and high-temperature stability.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Keskin

2021

J of Chemical Tech & Biotech

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BACKGROUND: NO x emissions are very toxic and cause serious adverse environmental effects. NO x reduction technologies have been developed due to the harmful effects of NO x and increasingly stringent emission standards which apply in many countries. Selective catalytic reduction (SCR) is the most effective method of removing NO x from engine exhaust. The suitable active catalysts are important for providing higher NO x conversion efficiencies in the SCR system. Catalyst production methods affect catalytic activity due to change in elemental composition, morphology, dispersion of catalytic elements, and total surface area. In this study, de-NO x performance of Ce/TiO 2 and Au-Ce/TiO 2 catalysts were investigated with real exhaust gases. Tests were carried out within 200-300°C temperature range to evaluate low temperature performance of the catalysts. Cordierite material was used as the support material and pre-treated with hot acid solution to enhance surface area. Ce content of synthesized catalysts with impregnation method was adjusted as 4 wt% and Au content as 0.4, 0.8, and 1.6 wt%. The catalysts were characterized with Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), X-Ray Diffractometer (XRD), and Fourier transform infrared spectroscopy (FT-IR) analysis. RESULTS: Maximum NO x conversion ratios obtained at 300°C with the Ce/TiO 2 , 0.4 Au-Ce/TiO 2 , 0.8 Au-Ce/TiO 2 , and 1.6 Au-Ce/ TiO 2 catalysts were 95.1%, 92%, 92.6%, and 90.2%, respectively. CONCLUSIONS:The results showed that in general, de-NO x effect of the Ce/TiO 2 catalyst was greater than the Au doped Ce/TiO 2 catalysts. Au addition adversely affected surface properties of the catalyst and therefore activity of the Au-Ce/TiO 2 catalysts decreased.

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“…The mechanism study showed that the NH3-SCR reaction follows the Eley-Rideal (E-R) mechanism in the case of the sulfated catalysts. Ma et al [26] also concluded that the Cu0.02Fe0.2-Ce0.2Ti0.8Ox catalyst has excellent H2O and SO2 resistance after modifying with appropriate cerium.…”

Section: Ce Modificationmentioning

confidence: 98%

Recent advances in heighten sulfur resistance of SCR catalysts: A review

Zhao

Zhang

Kang

2021

Environmental Engineering Research

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NOx removal by selective catalytic reduction (SCR) technology is a research hotspot in the field of environmental catalysis, and this method is dominated by catalysts. However, denitrification catalyst is easy to be polluted by the presence of SO2, which seriously restricts its practical industrial application. This review focuses on the latest domestic and foreign research results and advancement in improving sulfur resistance of deNOx catalysts, reveals the sulfur poisoning mechanism and regeneration process, as well as introduces the positive role of quantum chemistry in the field of sulfur resistance. In view of the questions set forth in this review, the future development direction of deNOx catalysts is prospected, which provides valuable scientific guidance for the design and development of efficient and practical sulfur resistant deNOx catalysts.

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Excellent low-temperature NH3-SCR NO removal performance and enhanced H2O resistance by Ce addition over the Cu0.02Fe0.2CeyTi1-yOx (y = 0.1, 0.2, 0.3) catalysts

Cited by 68 publications

References 40 publications

Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Recent advances in heighten sulfur resistance of SCR catalysts: A review

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Excellent low-temperature NH3-SCR NO removal performance and enhanced H2O resistance by Ce addition over the Cu0.02Fe0.2CeyTi1-yOx (y = 0.1, 0.2, 0.3) catalysts

Cited by 68 publications

References 40 publications

Effect of CaCO3on catalytic activity of Fe–Ce/Ti catalysts for NH3-SCR reaction

Effect of CaCO3on catalytic activity of Fe–Ce/Ti catalysts for NH3-SCR reaction

Investigation of deactivation effect of Au addition to Ce/TiO2 catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Recent advances in heighten sulfur resistance of SCR catalysts: A review

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Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

Effect of CaCO₃on catalytic activity of Fe–Ce/Ti catalysts for NH₃-SCR reaction

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions