The activity and mechanism study of Fe–Mn–Ce/γ-Al 2 O 3 catalyst for low temperature selective catalytic reduction of NO with NH 3

Cao, Fan; Su, Sheng; Xiang, Jun; Wang, Pengying; Hu, Song; Sun, Lei; Zhang, Anchao

doi:10.1016/j.fuel.2014.08.060

Cited by 189 publications

(61 citation statements)

References 41 publications

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“…For Fe(0.2)-Ti catalysts, three deconvoluted reduction peaks were displayed in the temperature range of 200-800˝C, reflecting the reductive nature of the iron species. The reduction peaks centered at 354 and 394˝C, which indicated greater intensity, can be assigned to the reduction of Fe 2 O 3 to Fe 2+ [5,22,23]. The splitting signal we detected may have been due to the various interactions of Fe with Ti or the reduction of Fe 3+ located in different sites within the catalyst structure [22].…”

Section: H 2 -Tpr Resultsmentioning

confidence: 71%

“…After Ce doping, the H 2 -TPR profile of Fe(0.2)-Ce(0.4)-Ti catalysts showed enhanced reduction peaks. The reduction peaks at 370˝C and 402˝C, which were similar to that of Fe(0.2)-Ti catalysts, were attributed to the reduction of Fe 2 O 3 to Fe 2+ while the peaks at 466˝C can be regarded as the reduction of the uppermost layer of Ce 4+ to Ce 3+ [23][24][25]. The broad reduction peaks at 628˝C can potentially be ascribed to the reduction of Fe 2+ to Fe 0 and the deeper interior of CeO 2 and bulk CeO 2 [4,25,26].…”

Section: H 2 -Tpr Resultsmentioning

confidence: 73%

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Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Wang

Zhang

et al. 2016

Catalysts

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Abstract:A series of Fe-Ce-Ti catalysts were prepared via co-precipitation method to investigate the effect of doping Ce into Fe-Ti catalysts for selective catalytic reduction of NO with NH 3 . The NO conversion over Fe-Ce-Ti catalysts was considerably improved after Ce doping compared to that of Fe-Ti catalysts. The Fe(0.2)-Ce(0.4)-Ti catalysts exhibited superior catalytic activity to that of Fe(0.2)-Ti catalysts. The obtained catalysts were characterized by N 2 adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (H 2 -TPR), temperature programmed desorption (NH 3 -TPD), Fourier transform infrared (FT-IR) spectrophotometry, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The data showed that the introduction of Ce results in higher surface area and better dispersion of active components on the catalyst surface and enhances the amount of surface acid sites. The interactions between Fe and Ce species were found to improve the redox ability of the catalyst, which promotes catalytic performance at low temperature. The XPS results revealed that Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ coexisted on the catalyst surface and that Ti was in 4+ oxidation state on catalyst surface. Ce doping increased the atomic ratio of Fe/Ti and Ce/Ti and enhanced the surface adsorbed oxygen species. In addition, Fe(0.2)-Ce(0.4)-Ti catalyst also showed better tolerance to H 2 O and SO 2 and up to 92% NO conversion at 270˝C with 200 ppm SO 2 added over 25 h, which suggests that it is a promising industrial catalyst for mid-low temperature NH 3 -selective catalytic reduction (SCR) reaction.

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Section: H 2 -Tpr Resultsmentioning

confidence: 71%

Section: H 2 -Tpr Resultsmentioning

confidence: 73%

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Wang

Zhang

et al. 2016

Catalysts

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“…Nevertheless, NO conversion by Mn-Ce/Al2O3 decreased quickly to 58% when SO2 and H2O were introduced into the gas flow simultaneously and the NO conversion was nearly stable over the next 124 h. The NO conversion then increased quickly to 70%, after the SO2 and H2O were removed. Meanwhile, the passivation effect was noticeably enhanced in the copresence of SO2 and H2O because in the atmosphere with O2 and H2O, SO2 reacts with NH3 to form (NH4)2SO4 and NH4HSO4, which are deposited on the catalyst surface, resulting in its deactivation [14]. According to the above results, it can be concluded that the Mn-Ce/Al2O3 catalyst exhibits some degree of SO2 and H2O resistance and that SO2 has a more significant inhibiting effect on the NH3-SCR catalytic activity than H2O [22,23].…”

Section: Effects Of So2 and H2o On No Removal Activitymentioning

confidence: 99%

“…Manganese oxides (MnO x ) have been extensively studied and proven to be highly active for low-temperature SCR of NO with NH 3 since they contain various types of labile oxygen species, which are essential for completing the catalytic cycle [12][13][14][15][16]. Researchers have also developed various Mn-based catalysts, such as MnO x /Al 2 O 3 [15], MnO x /TiO 2 [16,17] andMn-Ce-SnO 2 [18].…”

Section: Introductionmentioning

confidence: 99%

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

et al. 2018

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Honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 , with and without SO 2 and/or H 2 O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NO x conversion at 100 • C in the absence of SO 2 . However, SO 2 reduces the catalytic activity (80% to 72%) of the honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts under identical conditions. This finding demonstrated that the catalyst exhibited high activity at low temperature and excellent SO 2 resistance in the presence of 50 ppm SO 2 . The fresh and sulfated honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. Characterization results indicated that the deactivation by SO 2 was primarily the result of the deposition of ammonium hydrogen sulfate and sulfated CeO 2 on the catalyst surface during the SCR process. The formed sulfates depressed the catalytic activity via the blocking of pores and the occupation of active sites. Additionally, the competitive adsorption between SO 2 and NH 3 always decreased the catalytic activity.

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“…In the literature, abundant catalysts at low temperature have been explored such as transitional metals (Mn, Cu, Ce, Fe, Co, Mo) [10–13], novel metals (Pt, Pd) [14], and metal ion-exchange zeolite catalysts [15]. The Mn-based catalyst is one of the most active metal oxide catalysts for high N 2 selectivity at low temperature and is recognised by many researchers as a potential alternative for the common catalyst.…”

Section: Introductionmentioning

confidence: 99%

A review of carbon-based and non-carbon-based catalyst supports for the selective catalytic reduction of nitric oxide

Anthonysamy

Afandi

Khavarian

et al. 2018

Beilstein J. Nanotechnol.

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Various types of carbon-based and non-carbon-based catalyst supports for nitric oxide (NO) removal through selective catalytic reduction (SCR) with ammonia are examined in this review. A number of carbon-based materials, such as carbon nanotubes (CNTs), activated carbon (AC), and graphene (GR) and non-carbon-based materials, such as Zeolite Socony Mobil–5 (ZSM-5), TiO2, and Al2O3 supported materials, were identified as the most up-to-date and recently used catalysts for the removal of NO gas. The main focus of this review is the study of catalyst preparation methods, as this is highly correlated to the behaviour of NO removal. The general mechanisms involved in the system, the Langmuir–Hinshelwood or Eley–Riedeal mechanism, are also discussed. Characterisation analysis affecting the surface and chemical structure of the catalyst is also detailed in this work. Finally, a few major conclusions are drawn and future directions for work on the advancement of the SCR-NH3 catalyst are suggested.

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The activity and mechanism study of Fe–Mn–Ce/γ-Al 2 O 3 catalyst for low temperature selective catalytic reduction of NO with NH 3

Cited by 189 publications

References 41 publications

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

A review of carbon-based and non-carbon-based catalyst supports for the selective catalytic reduction of nitric oxide

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