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

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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ChemInform Abstract: Performance of Silica-Supported Copper Oxide Sorbents for SO /NO - Removal from Flue Gas. Part 2. Selective Catalytic Reduction of Nitric Oxide by Ammonia.

ChemInform ◽

10.1002/chin.199227286 ◽

2010 ◽

Vol 23 (27) ◽

pp. no-no

Author(s):

J. H. A. KIEL ◽

A. C. S. EDELAAR ◽

W. PRINS ◽

W. P. M. VAN SWAAIJ

Keyword(s):

Nitric Oxide ◽

Copper Oxide ◽

Selective Catalytic Reduction ◽

Flue Gas ◽

Catalytic Reduction ◽

No Removal

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Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Catalysts ◽

10.3390/catal9020205 ◽

2019 ◽

Vol 9 (2) ◽

pp. 205 ◽

Cited By ~ 5

Author(s):

Hao Zhou ◽

Mengyao Ge ◽

Huishuang Zhao ◽

Shiguo Wu ◽

Mengyu Li ◽

...

Keyword(s):

Nitric Oxide ◽

Ion Exchange ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Kinetic Studies ◽

Fe2o3 Nanoparticles ◽

Iron Species ◽

Hydrothermal Aging ◽

Lean Burn ◽

Preparation Methods

Fe/Beta catalysts were used for the selective catalytic reduction of nitric oxide with propylene (C3H6-SCR) under lean-burn conditions, which were prepared by liquid ion-exchange (LIE), solid-state ion-exchange (SIE), and incipient wet-impregnation (IWI) methods. The iron species on Fe/Beta were characterized and identified by a combination of several characterization techniques. The results showed preparation methods had a significant influence on the composition and distribution of iron species, LIE method inclined to produce more isolated Fe3+ ions at ion-exchanged sites than IWI and SIE method. C3H6-SCR activity tests demonstrated Fe/Beta(LIE) possessed remarkable catalytic activity and N2 selectivity at temperature 300–450 °C. Kinetic studies of C3H6-SCR reaction suggested that isolated Fe3+ species were more active for NO reduction, whereas Fe2O3 nanoparticles enhanced the hydrocarbon combustion in excess of oxygen. According to the results of in situ DRIFTS, more isolated Fe3+ sites on Fe/Beta(LIE) would promote the formation of the key intermediates, i.e., NO2 adspecies and formate species, then led to the superior C3H6-SCR activity. The slight decrease of SCR activity after hydrothermal aging of Fe/Beta(LIE) catalyst might be due to the migration of isolated Fe3+ ions into oligomeric clusters and/or Fe2O3 nanoparticles.

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