Methanol to Gasoline (MTG): Preparation, Characterization and Testing of HZSM-5 Zeolite-Based Catalysts to Be Used in a Fluidized Bed Reactor

Round 1

Reviewer 1 Report

See attached comments.

Comments for author File: Comments.pdf

Author Response

Thank you very much for your valuable comments.

In the attached Word document we describe the changes made to the manuscript based on your suggestions.

Author Response File: Author Response.pdf

Reviewer 2 Report

The research topic of the manuscript is the focus of Catalysts journal. It devoted to the preparation of ZSM-5-based catalysts for the Methanol To Gasoline (MTG) process. It is well known catalysts to the known process. In this case, an analysis of the published results and an emphasis on the novelty of the work done is required. Unfortunately, this manuscript has serious flaws and requires a major revision.

Below I will outline the main reasons for this decision.

1 In order to accommodate the industrial catalyst requirements, the zeolite is shaped by wet extrusion using bentonite as a binder and alumina as inert filler. Synthesis procedures and characterization of the catalysts can be found elsewhere. It is traditional approach to synthesis of zeolite-based catalysts. What is the novelty of applied approach in this work? What filler and binder content is usually used in these cases? I recommend adding this discussion.

2 What is the aqueous dispersion of colloidal alumina (Alfa Aesar, 20 wt.%, dp~50 nm)? It is colloidal a-Al2O3 or pseudo-boehmite with chemical composition corresponding to (AlO(OH) or Al{2}O{3}.H{2}O) as in “Aluminum oxide, 20% in H2O, colloidal dispersion” (Alfa Aesar, CAS 1344-28-1)? I recommend pointing out CAS number for all chemicals used.

3 The main problem of use of such catalysts in a fluidized bed reactor is their mechanical destruction. What are the requirements for the strength and stability of the catalysts? How many hours should they work? What are the activity requirements? This should be discussed in Introduction or Results and discussion parts.

4 Is catalysts testing 225 minutes long (Fig. 6) enough to conclude that they are stable in this process? Comparison with the initial H-ZSM-5 is required.

5 The article contains unnecessarily detailed information on the preparation of catalysts and methods of their study. This section may be shortened.

6 But, unfortunately, important details of the used catalytic reactor and the conditions of the catalytic experiment are missing. How was the composition of the reaction mixture analyzed? Was there a heat pretreatment of the catalyst before the experiment? And etc…

7 Is it possible to compare the obtained results on activity with the literature data?

Author Response

Thank you very much for your valuable comments.

In the attached Word document we describe the changes made to the manuscript based on your suggestions.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The authors answered all my questions. I recommend the article for publication.