Ammonia oxidation into nitrous oxide over Mn/Bi/Al catalystII. Fluidized bed reactor experiments

Носков, А. С.; Zolotarskii, I.A.; Pokrovskaya, S.A.; Kashkin, V.N.; Slavinskaya, Elena M.; Mokrinskii, V.V.; Korotkikh, V. N.

doi:10.1016/j.cej.2004.12.013

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Currently, NH 3 catalytic combustion is primarily utilized in power equipment with small power and strict volume requirements. Ongoing research focuses on catalysts to enhance catalytic combustion efficiency (including Mn/Bi/Al catalysts [155], platinum [156], Ru/Al 2 O 3 [157], and Pt gauzes/oxide monolithic layers [158]) and reactor structure [159]. Flame combustion, on the other hand, is a simple, direct, and rough heating method with high combustion temperature but low combustion efficiency.…”

Section: Research Routes Of Ia-pemfcsmentioning

confidence: 99%

“…Wickham et al [191] developed a selective catalyst combined with surface oxygen atom adsorption treatment technology, promoting the efficient and selective decomposition of NH 3 into N 2 and water. Noskov et al [155] found that the Mn/Bi/Al catalyst exhibited a high selectivity to NO x , reaching up to 88% in a fluidized bed reactor test. In an oxygen/steam environment, Warner et al [156] investigated 95% Pt/5% Rh gauze.…”

Section: Nox Emission and Nh3 Slip In Ia-pemfcsmentioning

confidence: 99%

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Application of NH3 Fuel in Power Equipment and Its Impact on NOx Emissions

Hu,

Liu,

et al. 2024

Energies

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Due to high greenhouse gas emissions, countries worldwide are stepping up their emission reduction efforts, and the global demand for new, carbon-free fuels is growing. Ammonia (NH3) fuels are popular due to their high production volume, high energy efficiency, ease of storage and transportation, and increased application in power equipment. However, their physical characteristics (e.g., unstable combustion, slow flame speed, and difficult ignition) limit their use in power equipment. Based on the structural properties of the power equipment, NH3 fuel application and emissions characteristics were analyzed in detail. Combustion of NH3 fuels and reduction measures for NOx emissions (spark plug ignition, compression ignition, and gas turbines) were analyzed from various aspects of operating conditions (e.g., mixed fuel, fuel-to-exhaust ratio, and equivalence ratio), structure and strategy (e.g., number of spark plugs, compression ratio (CR), fuel injection, and ignition mode), and auxiliary combustion techniques (e.g., preheating, humidification, exhaust gas recirculation, and secondary air supply). The performance of various NH3 fuel cell (FC) types was analyzed, with a focus on the maximum power achievable for different electrolyte systems. Additionally, the application and NOx emissions of indirect NH3 FCs were evaluated under flame and catalytic combustion conditions. The system efficiency of providing heat sources by burning pure NH3, anode tail gas, and NH3 decomposition gas was also compared. Based on a comprehensive literature review, the key factors influencing the performance and emissions of NH3-powered equipment were identified. The challenges and limitations of NH3-powered equipment were summarized, and potential strategies for improving efficiency and reducing emissions were proposed. These findings provide valuable insights for the future development and application of NH3 FCs.

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Section: Research Routes Of Ia-pemfcsmentioning

confidence: 99%

Section: Nox Emission and Nh3 Slip In Ia-pemfcsmentioning

confidence: 99%

Application of NH3 Fuel in Power Equipment and Its Impact on NOx Emissions

Hu,

Liu,

et al. 2024

Energies

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“…17,30,31 Nitrous oxide for such oxidation processes can also be produced on purpose via selective catalytic oxidation of ammonia. 18,32,33 One of the most interesting properties of N 2 O is its ability to react thermally with olefins to form ketones and aldehydes (the so-called ketonization reaction). Such oxidation can occur both in the liquid phase 19,34−39 and in the gas phase 40−42 with a high selectivity, in some cases exceeding 90%.…”

Section: Introductionmentioning

confidence: 99%

“…The use of waste nitrous oxide as a selective oxidizing agent for producing marketable products may serve as an attractive alternative to traditional methods (e.g., thermal or catalytic decomposition ,, ) for the abatement of N 2 O emissions from industrial processes. Separation and purification of N 2 O from waste gases for use in the oxidation processes are described by Solutia and BASF. ,, Nitrous oxide for such oxidation processes can also be produced on purpose via selective catalytic oxidation of ammonia. ,, …”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Selective Oxidation of Butenes in the C4 Fraction by Nitrous Oxide

Parfenov

Иванов

Харитонов

et al. 2022

Ind. Eng. Chem. Res.

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Direct oxidation of n-butenes is the preferred but yet unrealized route to methyl ethyl ketone (MEK). At the same time, N 2 O is a promising selective oxidant for conversion of olefins mainly to ketones. In this work, we studied the possibility of producing MEK via the gas-phase noncatalytic oxidation with N 2 O of butene isomers in the C4 refinery stream from catalytic cracking. The oxidation was performed at 573−823 K and a pressure of up to 2 MPa. NMR and gas chromatography methods were used to identify the reaction products. It was shown that N 2 O selectively oxidizes only butenes in the C4 fraction to form nitrogen and carbonyl products, among which MEK is predominant. The reaction proceeds through the 1,3-dipolar cycloaddition of N 2 O to the CC bond of butenes. The proposed method allows obtaining valuable oxygenates without the separation of the C4 fraction and opens a potential way for the rational utilization of waste N 2 O, a powerful greenhouse gas.

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