Effect of preparation procedures on catalytic activity and selectivity of copper-based mixed oxides in selective catalytic oxidation of ammonia into nitrogen and water vapour

Jabłońska, Magdalena; Nocuń, Marek; Gołąbek, Kinga; Palkovits, Regina

doi:10.1016/j.apsusc.2017.06.144

Cited by 37 publications

(22 citation statements)

References 45 publications

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“…suggested incorporation of the latter into the periclase structure has occurred [19]. N2 selectivity) as has been presented by Jabłońska et al [4,20]. Thus, hHighly dispersed CuOx favored high activity and N2 selectivity up to 500 C in NH3-SCO [5].…”

Section: Resultsmentioning

confidence: 59%

“…Cu-Mg-Al-Ox with 5-8 mol.% of copper was found to be optimal for NH3-SCO [4]. Cu-Mg-Al-Ox (Cu/Mg/Al = 5/66/29, mol.%) reached full conversion at 500 C with 86% N2 selectivity.…”

Section: Introductionmentioning

confidence: 97%

“…Cu-Mg-Al-Ox (Cu/Mg/Al = 5/66/29, mol.%) reached full conversion at 500 C with 86% N2 selectivity. The increase in copper loading in Cu-Mg-Al-Ox from 5 to 8 mol.% shifted the temperature for total ammonia conversion to about 100 C lower temperature; however, the selectivity to N2 dropped, especially at temperatures above 450 C [4]. A further decrease of N2 selectivity was observed with increasing copper loading from 10 up to 20 mol.% in Cu-Mg-Al-Ox under ideal (NH3/O2/He) conditions [5].…”

Section: Introductionmentioning

confidence: 99%

“…A further decrease of N2 selectivity was observed with increasing copper loading from 10 up to 20 mol.% in Cu-Mg-Al-Ox under ideal (NH3/O2/He) conditions [5]. Based on XRD, UV-vis-DRS and H2-TPR analyses, the presence of easily reducible highly dispersed CuOx caused the enhanced activity and selectivity to N2 over Cu-Mg-Al-Ox (Cu/Mg/Al = 5-8/66-63/29, mol.%) [4,6]. Another widely studied and one of the most efficient catalysts among transition metal based systems is copper oxide supported on -Al2O3 [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Jabłońska

Wolkenar

Beale

et al. 2018

Catalysis Communications

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Copper-based materials are promising catalysts in the selective catalytic oxidation of ammonia into nitrogen and water vapour (NH3-SCO). XRD, BET, NH3-TPD, H2-TPR and XAFS were used to characterize Cu-Mg-Al-Ox (Cu/Mg/Al = 8/63/29, mol.%) and (10 wt.%)Cu/Al2O3. Cu-Mg-Al hydrotalcite derived mixed metal oxides were obtained by coprecipitation, while Cu/Al 2 O 3 was prepared by incipient wetness impregnation. A highly dispersed copper oxide species formed on Cu-Mg-Al-Ox, while a mixture of highly dispersed and bulk copper oxide species (CuO and CuAl2O4) formed on Cu/Al2O3. The comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in the NH3-SCO gave insight into nature of active species of both copper-based catalysts. Highly dispersed easily reducible copper oxide species and bulk copper oxide species served as active under NH3/O2/N2 and NH3/O2/CO2/H2O/N2 conditions, respectively.

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Section: Resultsmentioning

confidence: 59%

“…Cu-Mg-Al-Ox with 5-8 mol.% of copper was found to be optimal for NH3-SCO [4]. Cu-Mg-Al-Ox (Cu/Mg/Al = 5/66/29, mol.%) reached full conversion at 500 C with 86% N2 selectivity.…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Jabłońska

Wolkenar

Beale

et al. 2018

Catalysis Communications

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“…Two-dimensional layered double hydroxide (LDH)-derived MMOs have recently attracted widespread attention because of their special two-dimensional structures, higher active sites, and specific surface areas [22,23,24]. For example, two-dimensional (2D) Co-Al MMOs that are derived from LDH have been investigated as a potential catalyst for NO x removal at high temperatures of 750 °C in the presence of oxygen and water [25].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Zhao

Wang

et al. 2018

Nanomaterials

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A two-dimensional MnAl-layered double oxide (LDO) was obtained by flash nanoprecipitation method (FNP) and used for the selective catalytic reduction of NOx with NH3. The MnAl-LDO (FNP) catalyst formed a particle size of 114.9 nm. Further characterization exhibited rich oxygen vacancies and strong redox property to promote the catalytic activity at low temperature. The MnAl-LDO (FNP) catalyst performed excellent NO conversion above 80% at the temperature range of 100–400 °C, and N2 selectivity above 90% below 200 °C, with a gas hourly space velocity (GHSV) of 60,000 h−1, and a NO concentration of 500 ppm. The maximum NO conversion is 100% at 200 °C; when the temperature in 150–250 °C, the NO conversion can also reach 95%. The remarkable low-temperature catalytic performance of the MnAl-LDO (FNP) catalyst presented potential applications for controlling NO emissions on the account of the presentation of oxygen vacancies.

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Exploring Dry Reforming of CH₄ to Syngas Using High‐Entropy Materials: A Novel Emerging Approach

Bhaskaran,

Roy

2024

ChemCatChem

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The high global warming potential of natural gas methane necessitates its conversion to valuable products, typically achieved through syngas production, with dry reforming of methane and integrating carbon capture followed by dry reforming of methane standing out among different technologies for methane valorization. However, persistent challenges such as the reverse water gas shift reaction, coke formation, and sintering associated with methane dry reforming have redirected scientific focus toward multi‐metallic catalysts with supports or promoters. High entropy materials have gained attention as promising catalysts because their flexible composition allows fine‐tuning of lattice oxygen reactivity and catalytic activity. Entropy plays a key role in catalysis, and recent research focuses on the enthalpy‐entropy relationship that influences reaction pathways. Alongside entropy, core effects like lattice distortion, sluggish diffusion, and cocktail effects improve catalytic performance by synergistic effects, prevent carbon buildup, and maintain stability at high temperatures, enabling efficient methane conversion. These advancements in high entropy materials drive interest in using entropy‐stabilized systems to address the challenges of methane dry reforming. This review summarizes the recent progress in dry reforming of methane and integrating carbon capture followed by dry reforming of methane using high entropy materials.

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Effect of preparation procedures on catalytic activity and selectivity of copper-based mixed oxides in selective catalytic oxidation of ammonia into nitrogen and water vapour

Cited by 37 publications

References 45 publications

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Exploring Dry Reforming of CH₄ to Syngas Using High‐Entropy Materials: A Novel Emerging Approach

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Effect of preparation procedures on catalytic activity and selectivity of copper-based mixed oxides in selective catalytic oxidation of ammonia into nitrogen and water vapour

Cited by 37 publications

References 45 publications

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Exploring Dry Reforming of CH4 to Syngas Using High‐Entropy Materials: A Novel Emerging Approach

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Exploring Dry Reforming of CH₄ to Syngas Using High‐Entropy Materials: A Novel Emerging Approach