Ammonia synthesis over γ-Al2O3 pellets in a packed-bed dielectric barrier discharge reactor

Zhu, Xinbo; Hu, Xueli; Wu, Xiqiang; Cai, Yuxiang; Zhang, Hongbin; Tu, Xin

doi:10.1088/1361-6463/ab6cd1

Cited by 52 publications

(34 citation statements)

References 38 publications

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“…The rate of ammonia desorption is strongly influenced by the acidity of the support material. A more basic support is associated with a higher rate of ammonia production as ammonia can desorb more easily . Besides the use of catalysts, addition of other gaseous compounds also showed improvements.…”

Section: Plasmas At Atmospheric Pressure Involving H2mentioning

confidence: 99%

Fundamental Properties and Applications of Dielectric Barrier Discharges in Plasma‐Catalytic Processes at Atmospheric Pressure

Ollegott

Wirth

Oberste‐Beulmann

et al. 2020

Chemie Ingenieur Technik

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The combination of a nonthermal plasma and a heterogeneous catalyst provides unique opportunities for chemical transformations. High densities of reactive species, such as ions, radicals or vibrationally excited molecules, are generated by electron collisions and initiate a multitude of chemical reactions in the gas phase. By shifting the reaction site from the gas phase to the surface of the catalyst, the selectivity of these reactions can be significantly enhanced. Dielectric barrier discharges (DBDs) are a promising plasma source for these kinds of applications due to their non‐equilibrium conditions and their simple construction. This review provides a brief introduction to the breakdown mechanism and the various geometries of DBDs and presents several plasma‐catalytic DBD applications.

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Section: Plasmas At Atmospheric Pressure Involving H2mentioning

confidence: 99%

Fundamental Properties and Applications of Dielectric Barrier Discharges in Plasma‐Catalytic Processes at Atmospheric Pressure

Ollegott

Wirth

Oberste‐Beulmann

et al. 2020

Chemie Ingenieur Technik

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“…13 Zhu et al also hypothesized that electronically excited metastable N 2 aids in the adsorption processes. 18 Bai et al assumed ionization to be detrimental for NH 3 formation. 14 Akay and Zhang argued that NH plasma radicals are most likely created between N and H 2 and that NH 3 can be formed by further hydrogenation reactions in the gas phase.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Catalytic Ammonia Synthesis in a DBD Plasma: Role of Microdischarges and Their Afterglows

et al. 2020

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Plasma-catalytic ammonia synthesis is receiving ever increasing attention, especially in packed bed dielectric barrier discharge (DBD) reactors. The latter typically operate in the filamentary regime when used for gas conversion applications. While DBDs are in principle well understood and already applied in the industry, the incorporation of packing materials and catalytic surfaces considerably adds to the complexity of the plasma physics and chemistry governing the ammonia formation. We employ a plasma kinetics model to gain insights into the ammonia formation mechanisms, paying special attention to the role of filamentary microdischarges and their afterglows. During the microdischarges, the synthesized ammonia is actually decomposed, but the radicals created upon electron impact dissociation of N 2 and H 2 and the subsequent catalytic reactions cause a net ammonia gain in the afterglows of the microdischarges. Under our plasma conditions, electron impact dissociation of N 2 in the gas phase followed by the adsorption of N atoms is identified as a rate-limiting step, instead of dissociative adsorption of N 2 on the catalyst surface. Both elementary Eley−Rideal and Langmuir−Hinshelwood reaction steps can be found important in plasma-catalytic NH 3 synthesis.

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“…224,225 An afterglow normally describes the effluent of a plasma reactor. However, the term is sometimes used more broadly to indicate that ( plasma) species are no longer exposed to The listed plasma reactors are dielectric barrier discharge (DBD), 96,131,142,[143][144][145][146][147][148][149][150][151][152][153][154][155][156][157][158][159][160][161][162][163][164][165][166][167][168][169] (low pressure) glow discharge (GD), 170,171,[172][173][174][175][176][177][178][179]180 microwave plasma (MW), [181][182][183][184][185]…”

Section: Discharge Typesmentioning

confidence: 99%

“…A drawback of a DBD reactor without a packing is the high ratio between plasma volume and surface area for catalytic reactions. Therefore, most authors introduced packing materials, such as oxides, 143,146,155,161,162,167,199,281 dielectric materials, 146,149,161,166 and ferro-electrics. 147 Introducing a packing material can lower the discharge power required to ignite the plasma.…”

Section: Performance In Various Types Of Plasma Reactorsmentioning

confidence: 99%

Plasma-driven catalysis: green ammonia synthesis with intermittent electricity

et al. 2020

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Ammonia synthesis over γ-Al₂O₃ pellets in a packed-bed dielectric barrier discharge reactor

Cited by 52 publications

References 38 publications

Fundamental Properties and Applications of Dielectric Barrier Discharges in Plasma‐Catalytic Processes at Atmospheric Pressure

Fundamental Properties and Applications of Dielectric Barrier Discharges in Plasma‐Catalytic Processes at Atmospheric Pressure

Plasma-Catalytic Ammonia Synthesis in a DBD Plasma: Role of Microdischarges and Their Afterglows

Plasma-driven catalysis: green ammonia synthesis with intermittent electricity

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