Aachen PK 2003 – wissenschaftliches Programm
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P: Plasmaphysik
P 18: Plasma Wall Interaction
P 18.3: Vortrag
Freitag, 21. März 2003, 11:10–11:30, FO1
Production of ammonia measured in N2-H2 plasma — •Jean-Pierre van Helden, Wiebe Wagemans, Peter Vankan, Timon Rutten, Daan Schram, and Richard Engeln — Department of applied physics, Eindhoven University of Technology, Eindhoven, Netherlands
In this contribution we focus on the formation of new molecules from atomic sources, investigating the efficiency and formation mechanism. We show that by using an atomic nitrogen and hydrogen source, ammonia can be formed efficiently.
To gain a better knowledge of the plasma-surface interactions that take place during the formation of stable molecules, we have investigated the formation of ammonia in N2-H2 plasma in more detail. Since plasma is used to produce the radicals for the ammonia production and the wall is used as a catalyst, the process is called plasma-activated catalysis. We will present results of the production of ammonia in expanding plasma generated from mixtures of atomic hydrogen and nitrogen. In case the plasma is generated from a mixture of hydrogen and nitrogen, 11% of the total background pressure is measured to be ammonia. The ammonia density is measured by a sensitive absorption technique, i.e. cavity-enhanced absorption. The results are obtained at pressures between 10 and 200 Pa. The measured ammonia density has a linear dependence on the pressure, which indicates that ammonia is mainly produced at the vessel wall.