Catalysts for NOx selective catalytic reduction by hydrocarbons (HC-SCR)

Mrad, Raya; Aissat, Aissa; Cousin, Renaud; Courcot, Dominique; Siffert, Stéphane

doi:10.1016/j.apcata.2014.10.021

Cited by 137 publications

(66 citation statements)

References 71 publications

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“…The presence of those acid sites could play an important role on the enhancement of the catalytic activity. Many studies [25][26][27] showed that the activity and the selectivity in HC-SCR depend on the presence of a certain degree of acidic sites. Hamada et al [28] attributed the lower activity in the presence of Fe to the presence of large iron oxide particles catalyzing only propene oxidation.…”

Section: Catalytic Testmentioning

confidence: 99%

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Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

et al. 2015

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Section: Catalytic Testmentioning

confidence: 99%

“…acetone). These surface species will react and lead to the formation of NCO and CN species which are then converted to N 2 via the oxidation or the hydrolysis of these nitrogen-containing species [25]. CO 2 and H 2 O are also formed.…”

Section: Catalytic Testmentioning

confidence: 99%

Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

et al. 2015

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“…In comparison, hydrocarbons (HC) like C 2 H 4 and C 3 H 8 have high reducibility, low cost and user‐friendliness, and would not cause ammonia sulphate deposits in HRSG. Recent research has shown that hydrocarbon reductants could offer good performance for deNO X activity …”

Section: Introductionmentioning

confidence: 99%

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

et al. 2019

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Current state‐of‐the‐art NH3‐SCR technology based on vanadium catalysts suffers problems associated with NH3 slip and poisoning of the catalyst and blockage of heat recovery steam generators (HRSG). If environmentally‐friendly catalysts capable of efficient operation at lower temperatures could be developed that used a reductant other than NH3, the issues with current state‐of‐the‐art SCR could be significantly lessened. Hence, in this study, activated carbon (AC) supported copper oxide‐based catalysts for SCR while using C2H4 as a reductant was discussed. Reaction testing of catalysts demonstrated high initial NO conversion with steeply declining activity over 2 h of testing when C2H4 was used as the reductant; in comparison, with the same catalyst and NH3 as the reductant, stable, long‐term NO conversion was achieved, but at a lower rate than the initial reactivity with C2H4. As a consequence, catalyst characterization studies were performed to assess deactivation mechanisms when C2H4 was the reductant. These studies included x‐ray diffraction, BET surface area and porosity, temperature programmed reduction, scanning electron microscopy, Raman spectroscopy and x‐ray photoelectron spectroscopy of both fresh and deactivated catalysts. The analytical results showed the surface area and porosity of the catalyst remained unchanged and the initially highly‐dispersed Cu species became agglomerated and more crystalline during reaction testing. Furthermore, carbon black was also detected on the catalyst surface after testing, presumably formed during the decomposition of C2H4. Both agglomeration of the active Cu species and blockage by carbon deposits would decrease the availability of active sites and lead to decreased catalytic activity.

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“…Meanwhile, the three-way catalyst with carbon monoxide (CO) and hydrocarbon is also used in mobile sources to remove NO from gasoline, but this technology is limited to diesel and lean-burn gasoline engines. In the SCR of NO, a reducing agent must be introduced into the system in order to successfully convert NO into nitrogen (N 2 ), inert gases such as ammonia (NH 3 ), and urea [5]. The reaction system reduces the Gibbs free energy values initiated by the reducing agent; the introduction of oxygen also contributes to this occurrence.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [9] reviewed low-temperature SCR on metal oxide and zeolite catalysts with a focus on catalyst performance and taking into account other possible mechanisms. Meanwhile, Mrad et al [5] reviewed and summarised the use of a hydrocarbon catalyst in the SCR of NO. However, not much effort has been made to summarise the progress of catalyst synthesis methods to achieve catalytic activity at low-temperature SCR.…”

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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Catalysts for NOx selective catalytic reduction by hydrocarbons (HC-SCR)

Cited by 137 publications

References 71 publications

Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

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

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Catalysts for NOx selective catalytic reduction by hydrocarbons (HC-SCR)

Cited by 137 publications

References 71 publications

Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

Propene oxidation and NO reduction over MgCu–Al(Fe) mixed oxides derived from hydrotalcite-like compounds

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C2H4 reductant

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

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Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant