Plasma-assisted catalytic formation of ammonia in N2-H2 plasma on a tungsten surface

被引:41
作者
Ben Yaala, Marwa [1 ]
Saeedi, Arsalan [1 ]
Scherrer, Dan-Felix [1 ]
Moser, Lucas [1 ]
Steiner, Roland [1 ]
Zutter, Marco [1 ]
Oberkofler, Martin [2 ]
De Temmerman, Gregory [3 ]
Marot, Laurent [1 ]
Meyer, Ernst [1 ]
机构
[1] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland
[2] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
[3] ITER Org, Route Vinon Sur Verdon,CS 90 046, F-13067 St Paul Les Durance, France
基金
瑞士国家科学基金会;
关键词
ABSOLUTE DENSITY-MEASUREMENTS; MICROWAVE-DISCHARGE; VIBRATIONAL KINETICS; NH3; DECOMPOSITION; PYROLYSIS; RADICALS; ELECTRON; NITRIDE; MIXTURE;
D O I
10.1039/c9cp01139k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Plasma catalysis has drawn attention in the past few decades as a possible alternative to the Haber-Bosch process for ammonia production. In particular, radio frequency plasma assisted catalysis has the advantage of its adaptability to the industrial scale. However, in the past years, very few experimental studies have focused on the synthesis of ammonia from nitrogen/hydrogen radio frequency plasma. As a consequence, to date, there has been little agreement about the complex mechanisms underlying the radio frequency plasma-catalyst interactions. Gaining such an understanding is therefore essential for exploiting the potential of radio frequency plasma catalysis for ammonia production. In this study, we present results of ammonia formation from a nitrogen/hydrogen radio frequency plasma both without and with a tungsten catalyst for different initial nitrogen ratios. High yields of ammonia up to 32% at 25/75% of nitrogen/hydrogen were obtained using a combination of radio frequency low pressure plasma and a W surface as a catalyst. Furthermore, based on chemical analysis of the catalytic surface composition, a formation pathway of ammonia via the Eley-Rideal mechanism between adsorbed nitrogen and hydrogen from the gas phase is presented.
引用
收藏
页码:16623 / 16633
页数:11
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