Tomohiro Nozaki

Abstract Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO 2 conversion into value-added chemicals and fuels, CH 4 activation into hydrogen, higher hydrocarbons or oxygenates, and NH 3 synthesis. Other applications are already more established, such as for air pollution control, e.g. volatile organic compound remediation, particulate matter and NO x removal. In addition, plasma is also very promising for catalyst synthesis and treatment. Plasma c

An atmospheric-pressure microplasma reactor was developed for the fabrication of tunable photoluminescent silicon nanocrystals. A mixture of argon, hydrogen, and silicon tetrachloride was activated by a capacitively coupled non-equilibrium plasma generated in a capillary glass tube with a volume less than 1 µl. The microplasma efficiently decomposes silicon tetrachloride into atomic silicon even though the residence time is approximately 100 µs. Supersaturated silicon vapour then leads to gas ph

Energy distribution and heat transfer mechanisms in atmospheric pressure non-equilibrium plasmas were investigated extensively through energy balance analysis, emission spectroscopy of the rotational band of CH (A2Δ→X2Π), and gas chromatographic analysis. Two plasma sources were examined: methane-fed dielectric barrier discharge (DBD) and atmospheric pressure glow-discharge (APG). The DBD features filamentary microdischarges accompanied by surface discharge along a dielectric barrier. As a resul

Using nonthermal plasma (NTP) to promote CO₂ hydrogenation is one of the most promising approaches that overcome the limitations of conventional thermal catalysis. However, the catalytic surface reaction dynamics of NTP-activated species are still under debate. The NTP-activated CO₂ hydrogenation was investigated in Pd₂Ga/SiO₂ alloy catalysts and compared to thermal conditions. Although both thermal and NTP conditions showed close to 100% CO selectivit

Abstract This review presents recent developments of formation techniques related to atmospheric pressure glow discharge. The description specifically emphasizes their application to carbon nanotube (CNT) synthesis based on our recent work. High‐purity vertically aligned single‐walled CNTs are producible only when an atmospheric pressure glow discharge is applied: even moderate pressure such as 20 kPa preferentially synthesizes multi‐walled CNTs. Lower operating pressures are known to produce ca

This study discusses the development of an atmospheric pressure glow discharge enhanced CVD system for the catalytic growth of carbon nanotubes (CNTs). He/H2/CH4 (900 : 100 : 0–20 scc min−1) gas mixture was processed in the barrier discharge reactor operated at 760 Torr. Ni-coated (20 nm) quartz substrate was used up to 600°C to achieve low temperature catalytic growth of CNTs. Special pretreatment of substrate using metal plating technique was employed for uniform growth; minimum requirements f