Ammonia Synthesis via Membrane Dielectric-Barrier Discharge Reactor Integrated with Metal Catalyst

IF 2.6 3区 物理与天体物理 Q3 ENGINEERING, CHEMICAL
Visal Veng, Saleh Ahmat Ibrahim, Benard Tabu, Ephraim Simasiku, Joshua Landis, John Hunter Mack, Fanglin Che, Juan Pablo Trelles
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Abstract

The synthesis of ammonia using non-thermal plasma can present distinct advantages for distributed stand-alone operations powered by electricity from renewable energy sources. We present the synthesis of ammonia from nitrogen and hydrogen using a membrane Dielectric-Barrier Discharge (mDBD) reactor integrated with metal catalyst. The reactor used a porous alumina membrane as a dielectric-barrier and as a distributor of H2, a configuration that leads to greater NH3 production than using pre-mixed N2 and H2. The membrane is surrounded by catalyst powder held by glass wool as porous dielectric support filling the plasma region. We evaluated nickel, cobalt, and bimetallic nickel-cobalt as catalysts due to their predicted lower activation energy under non-thermal plasma conditions as determined through Density Functional Theory (DFT) calculations. The catalysts were loaded at 5% by weight on alumina powder. The performance of the catalytic mDBD reactor was assessed using electrical, optical, and spectroscopic diagnostics, as well as Fourier-Transform Infrared spectroscopy. Experimental results showed that the glass wool support suppresses microdischarges, generally leading to greater ammonia production. The Ni-Co/Al2O3 catalyst produced the greatest energy yield of 0.87 g-NH3/kWh, compared to a maximum of 0.82 and 0.78 g-NH3/kWh for the Co/Al2O3 and Ni/Al2O3 catalysts, respectively. Although the differences in performance among the three metal catalysts are small, they corroborate the predictions by DFT. Moreover, the maximum energy yield for bare Al2O3 (no metal catalyst) with dielectric support was 0.38 g-NH3/kWh, for mDBD operation with no metal catalyst or dielectric support was 0.28 g-NH3/kWh, and for standard DBD operation (no membrane, dielectric support, or catalyst) was 0.08 g-NH3/kWh, i.e., 2.1, 3.1, and 11 times lower, respectively, than the maximum energy yield for the Ni-Co/Al2O3 catalyst with dielectric support. The study shows that the integration of dielectric membrane and metal catalyst is an effective approach at enhancing ammonia production in a DBD reactor.

Abstract Image

通过集成金属催化剂的膜介质阻挡放电反应器合成氨
利用非热等离子体合成氨对于以可再生能源电力为动力的分布式独立运行具有明显优势。我们介绍了利用集成金属催化剂的膜介质阻挡放电(mDBD)反应器从氮气和氢气合成氨的过程。该反应器使用多孔氧化铝膜作为电介质屏障和氢气分配器,与使用预混合的 N2 和 H2 相比,这种配置能产生更多的 NH3。膜的周围是催化剂粉末,由玻璃棉作为多孔介电支撑填充等离子体区域。我们评估了镍、钴和双金属镍钴催化剂,因为根据密度泛函理论(DFT)计算,它们在非热等离子体条件下的活化能较低。催化剂以 5%(重量)的比例负载在氧化铝粉末上。催化 mDBD 反应器的性能通过电学、光学、光谱诊断以及傅立叶变换红外光谱进行了评估。实验结果表明,玻璃棉支撑物可抑制微放电,从而提高氨的产量。Ni-Co/Al2O3 催化剂的能量产量最大,达到 0.87 克-NH3/千瓦时,而 Co/Al2O3 和 Ni/Al2O3 催化剂的最大能量产量分别为 0.82 克-NH3/千瓦时和 0.78 克-NH3/千瓦时。虽然三种金属催化剂的性能差异很小,但它们证实了 DFT 的预测。此外,带介电支撑的裸 Al2O3(无金属催化剂)的最大能量产率为 0.38 g-NH3/kWh,无金属催化剂或介电支撑的 mDBD 操作的最大能量产率为 0.28 g-NH3/kWh,标准 DBD 操作(无膜、介电支撑或催化剂)的最大能量产率为 0.08 g-NH3/kWh,分别比带介电支撑的 Ni-Co/Al2O3 催化剂的最大能量产率低 2.1、3.1 和 11 倍。研究表明,介质膜与金属催化剂的结合是提高 DBD 反应器氨生产的有效方法。
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来源期刊
Plasma Chemistry and Plasma Processing
Plasma Chemistry and Plasma Processing 工程技术-工程:化工
CiteScore
5.90
自引率
8.30%
发文量
73
审稿时长
6-12 weeks
期刊介绍: Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.
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