Alkaline Earth Carbonate Engineered Pt Electronic States for High-Efficiency Propylene Oxidation at Low Temperatures

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The author did a great job, clear text, well supported by experimental data widely referenced by the literature, but I need to point out three small flaws.

First, the author mentions this process as being catalytic, but how is this catalyst recovered? And how many times can it be used. Considering that it is a catalyst, it should not be consumed by the process.

Second, in Figures 7 and 8 in vertical column the nomenclature needs to be altered to transmittance (a.u.)

And finally, in Figure 4.2, the black curve for Pt-MgCO3 does not appear to have linear behavior. Are the data correct? Because in Journal of Molecular Liquids 190 (2014) 146–150, the author shows that a very small difference in the curve adjustment changed the entire interpretation.

Author Response

Please check the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

In their work "Alkaline-Earth Carbonate Engineered Pt Electronic States for High-Efficiency Propylene Oxidation at Low Temperatures" (catalysts-3750481) the authors describe the preparation of samples of the formal composition Pt/MCO3 (M = Mg, Ca, Ba) by the wet impregnation method with a platinum content of about 1%. In this case, the authors manage to quite reliably determine the structural features of the particles using X-ray methods, Ramond spectroscopy, and scanning electron microscopy (SEM), and the mentioned methods demonstrate a correlation. After the authors obtained a catalyst with a platinum content of 1%, the authors compared the powder diffraction patterns of the catalyst and the initial carbonates (Figure 1, a). Visually, the powder diffraction patterns are absolutely identical, perhaps only small peaks at the noise level. The question arises - does a small percentage of added platinum really not affect at least a slight amorphization of the initial carbonates? If so, then this method of analysis is not the best for the obtained catalytic systems.

I propose to analyze the diffraction patterns using additional mathematical calculations - use the Rietveld method, bring the difference in the diffraction patterns and make sure that they really correspond. Although the mentioned issues do not affect the content of the article, they should still be taken into account in the future development of this topic, as well as the question of the electronic structure of the platinum atom, which, presumably, controls the transfer of electrons in catalytic processes. In my opinion, the work is quite worthy and can be published in Catalysts.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf