Effect of Ce/Zr Composition on Structure and Properties of Ce1−xZrxO2 Oxides and Related Ni/Ce1−xZrxO2 Catalysts for CO2 Methanation
, Dmitriy I. Potemkin 1, Vladimir N. Rogozhnikov 1, Olga A. Stonkus 1, Anna M. Gorlova 1,2, Nadezhda A. Nikitina 1,3, Evgeniy A. Suprun 1, Andrey S. Brayko 1, Vladimir A. Rogov 1 and Pavel V. Snytnikov 1Round 1
Reviewer 1 Report
The manuscript “Effect of Ce/Zr composition on structure and properties of Ce1-xZrxO2 oxides and related Ni/Ce1-xZrxO2 catalysts for CO2 methanation “describes the classical Pechini synthesis of mixed oxides and their characterization as catalysts for CO methanation. The manuscript is well written in a detailed and reasonable manner. The methods for characterization are appropriately chosen and the results are correctly interpreted. The conclusions are based on the experimental results presented in the manuscript. I recommend publishing this manuscript as it is.
Author Response
We are very grateful to the reviewer for consideration of our manuscript.
Reviewer 2 Report
In this manuscript, the authors report CeZrOx oxides supported Ni catalysts for CO2 methanation. The effect of Ce/Zr ratio on structural information of the solid solution supports with respect to crystal strain, redox ability, etc. has been investigated. Its effect on the catalytic properties of the supported Ni catalysts has also been revealed. Careful characterization results support the conclusions, and therefore, this manuscript can be published after solving several minor issues.
(1) For XRD analyses, Rietveld refinement needs relatively high signal to noise ratio for the diffraction peaks. It would be better to provide the experimental details, including the signal intensity, the Rietveld fitting parameter and differences between the fitted and experimental patterns.
(2) It would be great if a 10% Ni/CeO2 catalyst was adopted as the reference for comparing the structural and catalytic properties with Ni/Ce1-xZrxO2 catalysts.
(3) The catalytic stability in a long-term reaction should be evaluated on an optimal catalyst.
(4) The structure stability of the selected catalysts against the reaction is not shown in this work, for instance, the size distribution of the active Ni0 particles in the spent catalysts after the reactions.
Author Response
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