Catalytic Effects of Metal-loaded Membrane-like Alumina Tubes on Ammonia Synthesis in Atmospheric Pressure Plasma by Dielectric Barrier Discharge |
| |
Authors: | Takanori Mizushima Kazumi Matsumoto Hironobu Ohkita Noriyoshi Kakuta |
| |
Affiliation: | (1) Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi Aichi, 441-8580, Japan |
| |
Abstract: | Plasma synthesis of ammonia was studied at atmospheric pressure using a dielectric-barrier-discharge-plasma reactor equipped with a metal-loaded membrane-like alumina tube as a catalyst between the electrodes. Introducing the pure alumina into N2–H2 plasma resulted in an increase in the ammonia yield and the further improvement was achieved by loading the alumina with Ru, Pt, Ni, and Fe. These results clearly demonstrate the catalytic effects of the alumina and the metals in the plasma reaction. Temperature-programmed desorption and isotope exchange reaction of nitrogen revealed that plasma-excited N2 molecules were subjected to dissociative adsorptions mainly on the alumina to form atomic N(a) (The suffix “(a)” denotes adsorbed species) species, which were converted into ammonia by H2 plasma. A role of the metals is considered to be acceleration of ammonia formation by the reaction of the alumina-adsorbed N(a) atoms with plasma-activated hydrogen species. |
| |
Keywords: | Atmospheric pressure plasma Plasma synthesis Ammonia Catalysis Membrane-like alumina tube Metal effects |
本文献已被 SpringerLink 等数据库收录! |