In situ FT-IR study of highly dispersed MnO x /SAPO-34 catalyst for low-temperature selective catalytic reduction of NO x by NH 3

Yu, Changming; Huang, Bichun; Dong, Lijie; Chen, Feng; Liu, Xiaoqing

doi:10.1016/j.cattod.2016.06.025

Cited by 91 publications

(44 citation statements)

References 58 publications

(95 reference statements)

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“…Meanwhile, the bands at, 3242 and 3120 cm −1 could be ascribed to the N-H stretching vibration of coordination NH 3 , and the bands at 1259 cm −1 (symmetric bending vibration of NH 3 on Lewis acid sites) and 1102 cm −1 (NH 3 species adsorbed on Lewis acid sites) also appeared [20,23,24]. The intensities of the peaks of NH + 4 species (1690, 1460 and 1408 cm −1 ) and -NH 2 species (1525 cm −1 ) first increased and then decreased in the temperature range of 250-350 • C. There were peaks at 960 and 930 cm −1 (NH 3 of gaseous state or weak adsorption state) under 300 • C. Yu et al [25] stated that the following reactions probably took place in the reaction:…”

Section: Characterizationsmentioning

confidence: 93%

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Chen

Qin

et al. 2019

Catalysts

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A sulfated sintered ore catalyst (SSOC) was prepared to improve the denitration performance of the sintered ore catalyst (SOC). The catalysts were characterized by X-ray Fluorescence Spectrometry (XRF), Brunauer–Emmett–Teller (BET) analyzer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared spectroscopy (DRIFTS) to understand the NH3-selective catalytic reduction (SCR) reaction mechanism. Moreover, the denitration performance and stability of SSOC were also investigated. The experimental results indicated that there were more Brønsted acid sites at the surface of SSOC after the treatment by sulfuric acid, which lead to the enhancement of the adsorption capacity of NH3 and NO. Meanwhile, Lewis acid sites were also observed at the SSOC surface. The reaction between −NH2, NH 4 + and NO (E-R mechanism) and the reaction of the coordinated ammonia with the adsorbed NO2 (L-H mechanism) were attributed to NOx reduction. The maximum denitration efficiency over the SSOC, which was about 92%, occurred at 300 °C, with a 1.0 NH3/NO ratio, and 5000 h−1 gas hourly space velocity (GHSV).

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Section: Characterizationsmentioning

confidence: 93%

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Chen

Qin

et al. 2019

Catalysts

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“…In this study, the extraordinary activity of catalysts prepared using sonochemical preparation route was proposed. In the literature, the activity of USY and ZSM-5 catalyst was previously discussed [18,19,22,23]. However, over the cited literature reference, the copper/zeolite catalysts were prepared by classical ion-exchange method.…”

Section: Discussionmentioning

confidence: 99%

DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

et al. 2017

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Abstract:Metallic supports play an important role as structured reactor internals. Due to their specific properties including enhanced heat and mass transport, high mechanical resistivity and elimination of local hot-spots, they are commonly used in gas exhaust abatement from stationary and automotive industries. In this study, the performance of three structured supports with deposited Cu/USY (Ultrastabilised Y-zeolite) for deNO x abatement were modelled. Based on kinetic and flow resistance experimental results, the one-dimensional (1D) model of structured reactor was developed. The performance of the structured reactors was compared by the length of the reactor necessary to achieve an arbitrary 90% NO x conversion. The performed simulations showed that the sonochemically prepared copper USY and ZSM-5 zeolites deposited on metallic supports may be successfully used as catalysts for deNO x process.

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“…Moreover, the addition of Fe enhanced the redox properties of the catalyst which accelerated the electron transfer. 8,17 Based on the XPS analysis results, the high ratios of Mn 4+ /Mn 3+ or Mn 2+ , Ce 4+ / Ce 3+ , and Ti 4+ /Ti 3+ could form dual redox cycles as shown in eqn (2) and (3), which accelerated the electron transfer and improved the NH 3 -SCR performance. 8…”

Section: Resistance To So 2 Poisoning On Fe Doped Ce-mn/tio 2 Catalystsmentioning

confidence: 99%

“…Nitrogen oxides (NO, NO 2 , N 2 O) are mainly emitted from power plants and vehicles from the combustion of N-containing fossil fuels. [1][2][3] These nitrogen oxides cause severe pollution to the environment and negative human health effects. [4][5][6][7] Technology involving the selective catalytic reduction (SCR) of NO x with NH 3 (NH 3 -SCR) has grown in recognition as the most effective and the most widely used method.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, using catalysts aer a desulfurization scrubber in the presence of lower dust and sulfur concentrations has been shown to be a signicantly superior method. This method increases the catalyst lifetime because a majority of the SO 2 and dust have been removed so that the deactivation of the catalyst does not readily take place. 10 The fundamental goal for downstream denitrication technology is to develop a SCR catalyst that possesses a high activity within lower-temperature ranges, possesses a strong anti-sulfur performance, and is vanadiumfree to be environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

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Facile preparation of high-performance Fe-doped Ce–Mn/TiO₂ catalysts for the low-temperature selective catalytic reduction of NO_x with NH₃

Cao

et al. 2017

RSC Adv.

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A Ce-Mn-Fe/TiO 2 catalyst has been successfully prepared using a single impregnation method, and excellent low-temperature NH 3 -SCR activity was demonstrated in comparison with other typical SCR catalysts including Mn-Ce/TiO 2 and metal-doped Mn-Ce/TiO 2 . The crystal structure, morphology, textural properties, valence state of the metals, acidity and redox properties of the novel catalyst were investigated comprehensively by X-ray diffraction (XRD), N 2 adsorption and desorption analysis, X-ray photoelectron spectroscopy (XPS), NH 3 -temperature-programmed desorption (NH 3 -TPD), and H 2temperature-programmed reduction (H 2 -TPR). The Fe-doped Ce-Mn/TiO 2 catalyst boosted the lowtemperature NH 3 -SCR activity effectively under a broad temperature range (100-280 C) with a superior NO conversion rate at low temperatures (100 C, 96%; 120-160 C, $100%). Fe doping caused this improvement by enlarging the catalyst pore volume, improving the redox properties, and increasing the amount of acidic sites. These properties enhanced the ability of the catalyst to adsorb NH 3 and improved the low-temperature SCR performance, especially at temperatures lower than 150 C. Moreover, redox cycles of Ce, Mn, and Ti (Mn 4+ + Ce 3+ 4 Mn 3+ + Ce 4+ , Mn 4+ + Ti 3+ 4 Mn 3+ + Ti 4+ ) also played an important role in enhancing the low-temperature SCR efficiency by accelerating the electron transfer.The excellent NH 3 -SCR result is promising for developing environmentally-friendly and more effective industrial catalysts in the future.

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In situ FT-IR study of highly dispersed MnO x /SAPO-34 catalyst for low-temperature selective catalytic reduction of NO x by NH 3

Cited by 91 publications

References 58 publications

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

Facile preparation of high-performance Fe-doped Ce–Mn/TiO₂ catalysts for the low-temperature selective catalytic reduction of NO_x with NH₃

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In situ FT-IR study of highly dispersed MnO x /SAPO-34 catalyst for low-temperature selective catalytic reduction of NO x by NH 3

Cited by 91 publications

References 58 publications

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

Facile preparation of high-performance Fe-doped Ce–Mn/TiO2 catalysts for the low-temperature selective catalytic reduction of NOx with NH3

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Facile preparation of high-performance Fe-doped Ce–Mn/TiO₂ catalysts for the low-temperature selective catalytic reduction of NO_x with NH₃