Selective catalytic reduction of NO with NH3 over Cr-ZSM-5 catalysts: General characterization and catalysts screening

Ayari, Faouzi; Mhamdi, Mourad; Álvarez-Rodríguez, J.; Guerrero-Ruı́z, A.; Delahay, Gérard; Ghorbel, Abdelhamid

doi:10.1016/j.apcatb.2013.01.026

Cited by 41 publications

(28 citation statements)

References 61 publications

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“…(2) 1.210 g TEPA was added to solution and stirred for 1.0 h. (3) 0.7000 g NaOH and 0.5140 g NaAlO 2 (equals to about 0.2107 g Al 2 O 3 ) were added and stirred for 60 min. (4) 3.600 mL silica sol (equals to about 1.228 g SiO 2 ) was stirred with the solution for 3 h. (5) The mixed solution was transferred to Teflon-lined autoclaves and the crystallization reaction was carried out at 140 8C for 96 h. Then the product was washed and dried at 1008C for 12 h. (6) The product was treated in the nitric acid solution (pH = 1) at 80 8C for 12 h. Then it was separated by vacuum filtration, washed, and dried at 100 8C for 12 h. (7) The product was calcined at 550 8C for 4 h. By changing the mole ratios of Cu-TEPA/Al 2 To study the hydrothermal stability, the zeolite was treated in air flow containing 10 vol.% H 2 O of 25.0 mL·min À1 for 24 h at 750 8C. In order to study the anti-sulfur performance, the selected sample was treated in the gas atmosphere of 100 ppm SO 2 /Ar at 350 8C for 16 h. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 NH 3 -SCR activity measurement: The NH 3 -SCR activity of the Cu-SSZ-13 was measured in the micro reactor.…”

Section: Methodsmentioning

confidence: 99%

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

2018

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The Cu‐SSZ‐13 catalysts with different copper content are prepared by one‐pot method and changing the mole ratio of Cu‐tetraethylenepentamine/Al2O3. Cu‐SSZ‐13 catalyst with 3.25 wt.% Cu exhibits excellent catalytic activity (operation temperature window of 145–490 °C), adaptability to high GHSV (gas hourly space velocity) and hydrothermal stability in NH3‐SCR reaction. The results of XRD Rietveld refinement coupled with H2‐TPR and EPR show that three active Cu2+ species (Cu1, Cu2 and Cu3) locate in various sites in the CHA (chabazite) structure and play different action in NH3‐SCR reaction. Cu1 species situated close to an eight‐membered‐ring play a crucial role in the low temperature activity for its optimum reduction ability. While Cu3 species located in the center of the hexagonal prism are the most stable and its content basically remains unchanged after SO2 pretreatment, which contributes to the excellent SO2 resistance.

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Section: Methodsmentioning

confidence: 99%

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

2018

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“…Chromium based catalysts, e.g. amorphous and crystalline Cr 2 O 3, chrome supported on TiO 2, Al 2 O 3, Cr–MnOx mixed‐oxide, and Cr exchanged ZSM‐5 catalysts have been extensively studied over the last decade for the SCR of NO with NH 3 . They are quite promising catalysts for low‐temperature SCR operations.…”

Section: Introductionmentioning

confidence: 94%

“…The texture of PILC depends greatly on the pillars. Chromium oxide is not only a frequently used pillar, but also a SCR catalyst because of its large range of oxidation numbers and relative acidity . Chromium based catalysts, e.g.…”

Section: Introductionmentioning

confidence: 99%

Co-catalytic effect of Al-Cr pillared montmorillonite as a new SCR catalytic support

Chen

Cen

Feng

et al. 2016

J. Chem. Technol. Biotechnol.

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BACKGROUND It is of great interest to use pillared clay (PILC) as a cheap support for a selective catalytic reduction (SCR) catalyst. Al‐Cr pillared clay (AlCr‐PILC) has high thermal stability due to the introduction of polycations of Al. As a support, AlCr‐PILC may show a co‐catalytic effect in SCR processes because chromium oxide itself is an active SCR catalyst. The aim of this work is to investigate the potential of AlCr‐PILC as a new low temperature SCR catalyst support. RESULTS A series of AlCr‐PILC with Al:Cr molar ratio varying from 0:4 to 4:0 were successfully synthesized to support manganese and cerium active phase. MnCe/AlCr(2:2)‐PILC exhibited the highest NOx conversion close to 100% at 200–300 °C, and more than 90% N2 selectively over a wide temperature window of 140–300 °C. The catalytic activity of MnCe/AlCr‐PILC in terms of both NOx conversion and N2 selectivity is much higher than those of MnCe/Al‐PILC, MnCe/Cr‐PILC, AlCr‐PILC, and the simple mixed MnCeAlCr, indicating the co‐catalytic effect of AlCr‐PILC support. CONCLUSION AlCr‐PILC is a very promising low‐temperature SCR catalyst support. The XRD, XPS, and H2‐TPR measurements prove that the co‐catalytic effect of AlCr‐PILC occurred via the strong interaction between MnCe and the AlCr‐PILC support. © 2016 Society of Chemical Industry

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“…Metal‐based ZSM‐5 zeolites were investigated as SCR catalysts in the beginning of 1990s, and quickly gained attention because of the comparable, or even superior performance on comparison with the commercialized V 2 O 5 ‐WO 3 /TiO 2 catalysts . In the past few decades, many transition metals (Cu, Fe, Cr, Mn, etc.) promoted ZSM‐5 catalysts have been utilized for NH 3 ‐SCR after the precursory work by Iwamoto and Hamada on Cu‐ZSM‐5.…”

Section: Current Zeolite‐based Nh3‐scr Materialsmentioning

confidence: 99%

Zeolitic Materials for DeNO_x Selective Catalytic Reduction

2017

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Selective catalytic reduction (SCR) of NOx has been proven to be the most efficient technique for the removal of NOx (deNOx) from flue gas of stationary sources and diesel engine exhaust of mobile sources. Among various SCR catalysts, zeolites are considered as the most promising candidates for heavy‐duty trucks owing to their benign nature, very high NOx conversion and N2 selectivity, as well as excellent hydrothermal stability at high temperatures. In recent years, a tremendous number of research articles have reported on the evolution of zeolitic materials for deNOx, which makes a critical review timely to provide inspiration for future development. This paper first gives a chronological progress of zeolite catalysts specifically highlighting the CHA zeolites, the hotspot of present research and application, followed by a summary on the synthesis of CHA zeolites, the structure–activity relationships, as well as the reaction mechanisms and kinetics. Last but not least, a critical outlook is given together with expected research directions in developing zeolite‐based catalysts for deNOx.

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Selective catalytic reduction of NO with NH3 over Cr-ZSM-5 catalysts: General characterization and catalysts screening

Cited by 41 publications

References 61 publications

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

Co-catalytic effect of Al-Cr pillared montmorillonite as a new SCR catalytic support

Zeolitic Materials for DeNO_x Selective Catalytic Reduction

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Selective catalytic reduction of NO with NH3 over Cr-ZSM-5 catalysts: General characterization and catalysts screening

Cited by 41 publications

References 61 publications

A New Insight into Active Cu2+ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NOx Reduction by NH3

A New Insight into Active Cu2+ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NOx Reduction by NH3

Co-catalytic effect of Al-Cr pillared montmorillonite as a new SCR catalytic support

Zeolitic Materials for DeNOx Selective Catalytic Reduction

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Product

Resources

About

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

Zeolitic Materials for DeNO_x Selective Catalytic Reduction