Effects of Cu Species on Liquid-Phase Partial Oxidation of Methane with H2O2 over Cu-Fe/ZSM-5 Catalysts
Round 1
Reviewer 1 Report
I recommend the publication of this paper in the Catalysts after a major revision according to the following comment:
1- Surface analysis by XPS spectroscopy and measurement of iron and copper concentrations in the catalysts is valuable and suggested.
2- SEM-EDX analysis is suggested to do for the catalysts.
Author Response
Please see the attached file.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The manuscript concerns a important and interesting problem i.e. production of oxygenstes from methane with H2O2. The research was well planed, well realized and well described.
I propose to accept it "as is"
Author Response
We appreciate the reviewer's kind comments.
Reviewer 3 Report
The paper titled with “Effects of Cu species on liquid-phase partial oxidation of methane with H2O2 over Cu-Fe-ZSM-5 catalysts”, presented interesting scientific work. The work described the adapting Fe-ZSM-5 support by Cu ions in two phases as heterogeneous and homogeneous one. The catalysts prepared by different synthetic methods such as: ion exchange (two phases) and wet impregnation. Different techniques were used for characterized the solid materials. Moreover, the catalysts were applied in the liquid-phase oxidation of methane by using H2O2 as an oxidant source. However, I am recommending to publish this work in the journal of catalysts after major revision.
The comments as following:
in the introduction part (lines 43-50): you discussed about the enzymatic systems for methane oxidation, then you presented an examples based on metal/ion deposited on the supports like zeolite, carbon and so on....
you should modified and make it more clear the difference bio/heterogeneous catalytic systems
in the introduction why ZSM-5 zeolite support should be mentioned
for the BET data in table 1; its clearly that after deposited the metal ions on the zeolite the textural parameters changed like micorpore volume/area this is need interpretations (as example H-ZSM-5 ( 0.12 cm3/g ) ) why decreased after Cu and Fe insertion and so on......the extract information will help to explain the other data in the draft also, the isotherm profiles of the prepared catalysts are important which were missing here!
is it the amount of the Cu in the reaction are the same in both heterogeneous (Cu-ZSM-5 catalyst family) catalyst and homogeneous one. and how you controlled. please added all this information in the manuscript.
you cannot mixed the flow reactions with batch reactions due to their substantial differences….i am suggesting to branched the part of catalytic activity in two parts
please try to keep the notation in the same manner in all the manuscript, sometimes Cu-Fe-ZSM-5 and other times Cu-Fe/ZSM-5.
how you proved that the metal ions on your support has highly dispersed? XPS and/or SEM/TEM can improve the work XRD is needed
In the discussion part (catalytic activity), and analysis of the products is not well written and presented. its hard to follow and understood.
any reaction tests with different H2O2 amounts you made
i am suggestion to introduce the discussion with the result which can be more useful to understood and also to follows.
Author Response
Please see the attached file.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The manuscript has been revised according to comments. I suggest that the manuscript in its current form be accepted for publication in Catalysts.
Reviewer 3 Report
I believe the draft does not need any further modifications.
