Preparation of MgCl2-Supported Ziegler-Natta Catalysts via New Surfactants Emulsion for Propylene Polymerization
Round 1
Reviewer 1 Report
The manuscript entitled “Preparation of MgCl2-supported Ziegler-Natta Catalysts via new surfactants emulsion for Propylene Polymerization” by Jiang et al., is a short but interesting piece of work in the field of supported Ziegler-Natta catalyst for propylene polymerization.
The manuscript seems well-written and the results accurately presented.
The experimental work, including the catalyst preparation and characterization has been properly carried out and the evidences given to support the results look acceptable on the bases of the multiple techniques employed in the characterization of all materials prepared, such as scanning electron microscopy, laser particle size analyser, energy-dispersive X-ray spectrometry, powder X-ray diffraction, and FTIR and GC-MS studies.
Having said this, I cannot recommend publication for this work in Catalysts in its current form on the bases of the following major points:
- The authors should introduce a Chart presenting the catalytic process studied in order to make the reader easier to follow the results presented later on.
- The authors claim that the catalyst used for the bulk polymerization of propylene exhibits high catalytic activity, high stereospecificity, and high hydrogen response-ability on the bases of only one experimental run included on Table 2. I would recommend to study the effect of different reaction parameters such as catalyst loading, as well as time and temperature reaction.
- The pictures included on Figure 12 should be resized and increased.
- More recent References of interest for readers should be incorporated in the Bibliography Section, since the newest one is from 2018.
Author Response
Responses to the comments of Reviewer 1:
Question: The authors should introduce a Chart presenting the catalytic process studied in order to make the reader easier to follow the results presented later on.
Response: We have drawn a chart for the description of the study and inserted it into the abstract section of the manuscript.
Question: The authors claim that the catalyst used for the bulk polymerization of propylene exhibits high catalytic activity, high stereospecificity, and high hydrogen response-ability on the bases of only one experimental run included on Table 2. I would recommend to study the effect of different reaction parameters such as catalyst loading, as well as time and temperature reaction.
Response: We have added the effect of reation temperature in the manuscript.
Question: The pictures included on Figure 12 should be resized and increased.
Response: We have remove Figure and Figure 12.
Question: More recent References of interest for readers should be incorporated in the Bibliography Section, since the newest one is from 2018.
Response: We have added four recent papers related to the content of manuscripts, and their numbers are [4], [11], [20].
Reviewer 2 Report
This is an excellent and well researched manuscript that investigates various procedures and reagents to obtain optimal spherical catalyst microparticles. The beneficial effect in producing spherical catalyst particles by adding both a emulsion stabilizer and a turbulence reducer was dramatically shown in the SEM images in Figure 1. The detailed analysis of the catalyst by using a battery of physical techniques and their interpretation is excellent. I only have one very minor comment: Figure 1 should be labelled. The manuscript is otherwise ready for publication.
Author Response
Responses to the comments of Reviewer 2:
Question: Figure 1 should be labelled.
Response: We have marked the surfactant used on Figure 1 to make it easier for readers to read.
Round 2
Reviewer 1 Report
The manuscript entitled “Preparation of MgCl2-supported Ziegler-Natta Catalysts via new surfactants emulsion for Propylene Polymerization” by Jiang et al., has been clearly improved attending to the referee’s comments.
For this reason, I recommend publication for this work in Catalysts in its current form.
Minor points. I would have included the Char in the Introduction section as Chart 1 rather than in the Abstract Section.
Author Response
Question: The authors should introduce a Chart presenting the catalytic process studied in order to make the reader easier to follow the results presented later on.
Response: We have drawn a chart for the description of the study and inserted it into the introdcution section of the manuscript.
Question: The authors claim that the catalyst used for the bulk polymerization of propylene exhibits high catalytic activity, high stereospecificity, and high hydrogen response-ability on the bases of only one experimental run included on Table 2. I would recommend to study the effect of different reaction parameters such as catalyst loading, as well as time and temperature reaction.
Response: We have added the effect of reation temperature in the manuscript.
Question: The pictures included on Figure 12 should be resized and increased.
Response: We have remove Figure and Figure 12.
Question: More recent References of interest for readers should be incorporated in the Bibliography Section, since the newest one is from 2018.
Response: We have added four recent papers related to the content of manuscripts, and their numbers are [4], [11], [20].
Reviewer 2 Report
The manuscript is improved after the authors have made suggested changes. I recommend publication.
Author Response
Question: Figure 1 should be labelled.
Response: We have marked the surfactant used on Figure 1 to make it easier for readers to read.
