%0 Journal Article
%T Direct Preparation of Hydrogen and Carbon Nanotubes by Microwave Plasma Decomposition of Methane over Fe/Si Activated by Biased Hydrogen Plasma
%A Katsuya Konno
%A Kaoru Onoe
%A Yasuyuki Takiguchi
%A Tatsuaki Yamaguchi
%J Green and Sustainable Chemistry
%P 19-25
%@ 2160-696X
%D 2013
%I Scientific Research Publishing
%R 10.4236/gsc.2013.31004
%X <p>
	<span>Methane was decomposed to hydrogen and carbon nanotubes (CNTs)
by microwave plasma, using Fe/Si catalyst acti</span><span>vated by biased (<span style=\"white-space:nowrap;\">¡ª</span>150
V) hydrogen plasma for various treatment times. Upon exposure to biased
hydrogen plasma, the catalyst surface becomes lumpy within 1 min, coheres
between 5 and 10 min and forms particles after 20 min. The methane conversion
increased up to 93% over the treatment time of 5 min. The hydrogen yield showed
as similar ten</span><span>dency as the methane conversion and kept 83% at treatment time of 5
min. The treatment time up to 1 min increased the amount of deposited carbon,
and after treatment time of 5 min it dropped; then again after treatment time
of 20 min, it increased to reach a maximum value of 22 g</span><sub><span>c</span></sub><span>/g<sub>cat</sub>.
Deposited carbon was found to be consisted of carbon nanotubes. It grew
vertically on the catalyst surface and reached a maximum length of 30.7 nm
after treatment time of 10 min. Multi</span><span>ple types of CNTs were present, and the CNT
diameters decreased with increasing plasma treatment time.</span><span></span> 
</p>
%K Hydrogen
%K Methane Decomposition
%K Carbon Nanotubes
%K Microwave Plasma
%K Methane
%K H2 Plasma Treatment
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=28066