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Journal of Natural Gas Chemistry
Manuscript number：20060106 Authors：Antonius Indarto,Jae-Wook Choi,Hwaung Lee,Hyung Keun Song Title：Methane Conversion Using Dielectric Barrier Discharge:Comparison with Thermal Process and Catalyst Effects Referee A: Please further polish the languages of the paper. Referee B: Dielectric barrier discharge is an effective and interesting method for methane conversion. Several research groups have done lots of works in the
field.
This
paper
presented
some
experiments
about
conversion via electric discharge process with the title of
methane "Methane
Conversion Using Dielectric Barrier Discharge: Comparison with Thermal Process and Catalyst Effects". However, as I know, the experiments showed in the paper have little relativity on dielectric barrier discharge, it's only the normal electric discharge process. The reactor of dielectric barrier discharge is slightly different from that of normal electric discharge process (Please read the relative eferences). Normally,
in
the
Dielectric
Barrier
Discharge
process,
there
are
catalysts or other solid materials presented between the cathode and anode. The reactor showed in the paper is more like a corona discharge reactor, because no materials are filled between two electrodes and the catalyst bed is only located in the end of the reactor. Therefore, whether the author may consider revising the title of the paper. More over, there some questions derived from the paper: 1.The catalysts prepared in the experiments were only processed by
calcinations without reductive process. So that the metals on the catalysts showed different values, the Pt and Ru kept mainly Pt0 and Ru0, and Ni kept Ni2+, respectively. It is meaningless to compare the catalytic activity, especially the hydrogenation activity of metal and metal oxide in the discussion section of the paper. 2.In P7, the authors believed that "At a higher flow rate, the collisions are more effective although the percentage of conversion is lower, as seen in Figure 4. More numbers of methane molecules are converted at higher flow rates than that at lower ones.", which is conflicted with the previous discussion: "Lower flow rates will give longer chance for the molecules to collide with energetic species, such as electron.", and the reaction data. As we know, more collisions will lead
to
more
numbers
of
methane
molecules
reacting,
and
higher
conversion of methane followed. However, the results in Figure 3 showed that the conversion of methane decreased with the flow rate increasing. The energy efficiency is mainly depended on the reactor designing.
Journal of Natural Gas Chemistry
Manuscript number：20060106 Authors：Antonius Indarto,Jae-Wook Choi,Hwaung Lee,Hyung Keun Song Title：Methane Conversion Using Dielectric Barrier Discharge:Comparison with Thermal Process and Catalyst Effects Referee A: Please further polish the languages of the paper. Referee B: Dielectric barrier discharge is an effective and interesting method for methane conversion. Several research groups have done lots of works in the
field.
This
paper
presented
some
experiments
about
conversion via electric discharge process with the title of
methane "Methane
Conversion Using Dielectric Barrier Discharge: Comparison with Thermal Process and Catalyst Effects". However, as I know, the experiments showed in the paper have little relativity on dielectric barrier discharge, it's only the normal electric discharge process. The reactor of dielectric barrier discharge is slightly different from that of normal electric discharge process (Please read the relative eferences). Normally,
in
the
Dielectric
Barrier
Discharge
process,
there
are
catalysts or other solid materials presented between the cathode and anode. The reactor showed in the paper is more like a corona discharge reactor, because no materials are filled between two electrodes and the catalyst bed is only located in the end of the reactor. Therefore, whether the author may consider revising the title of the paper. More over, there some questions derived from the paper: 1.The catalysts prepared in the experiments were only processed by
calcinations without reductive process. So that the metals on the catalysts showed different values, the Pt and Ru kept mainly Pt0 and Ru0, and Ni kept Ni2+, respectively. It is meaningless to compare the catalytic activity, especially the hydrogenation activity of metal and metal oxide in the discussion section of the paper. 2.In P7, the authors believed that "At a higher flow rate, the collisions are more effective although the percentage of conversion is lower, as seen in Figure 4. More numbers of methane molecules are converted at higher flow rates than that at lower ones.", which is conflicted with the previous discussion: "Lower flow rates will give longer chance for the molecules to collide with energetic species, such as electron.", and the reaction data. As we know, more collisions will lead
to
more
numbers
of
methane
molecules
reacting,
and
higher
conversion of methane followed. However, the results in Figure 3 showed that the conversion of methane decreased with the flow rate increasing. The energy efficiency is mainly depended on the reactor designing.
