Study on the Catalytic Pyrolysis Mechanism of Lignite by Using Extracts as Model Compounds

Round 1

Reviewer 1 Report

Title: Study on the catalytic pyrolysis mechanism of lignite by using extracts as model compounds

Date: Oct. 25, 2019

This manuscript presents interesting results related to catalytic pyrolysis mechanism of lignite by using extracts from parent coal as model compounds. This paper will contribute to understanding catalytic pyrolysis mechanism for improving productivity. Thus, this paper deserves publication after minor revision. Please see the following comments.

Please check “signal” is correct. (row 63) It is recommended to delete sentence of “Thermogravimetry ~ purposes.”. Please give the model and company of GC×GC-MS. Please revise the location of caption of Fig. 2 from left to the center. Please revise the express of figure. (Fig. 3 and 4) Please give the space in the caption of figure (Fig.6.->Fig. 6.) Please check the order of Figure. (there is no Fig. 7.)

 

Author Response

Comment

This manuscript presents interesting results related to catalytic pyrolysis mechanism of lignite by using extracts from parent coal as model compounds. This paper will contribute to understanding catalytic pyrolysis mechanism for improving productivity. Thus, this paper deserves publication after minor revision. Please see the following comments.

(1). Please check “signal” is correct. (row 63)

(2). It is recommended to delete sentence of “Thermogravimetry ~ purposes.”.

(3). Please give the model and company of GC×GC-MS.

(4). Please revise the location of caption of Fig. 2 from left to the center.

(5). Please revise the express of figure. (Fig. 3 and 4)

(6). Please give the space in the caption of figure (Fig.6.->Fig. 6.)

(7). Please check the order of Figure. (there is no Fig. 7.)

Response:

We are sorry for these mistakes, and now we have changed in the revised manuscript as follows.

“signal” was corrected as “single” (Line 65) The sentence of “Thermogravimetry~purpose” has been deleted in the revised manuscript. In this work, an Agilent 7890B gas chromatograph equipped with a 5977A mass spectrometer (Agilent Technologies, USA) and an extra ZX10542 thermal modulator (ZOEX Corporation, USA) were assembled in a GC×GC-MS system. High purity helium (99.999%) was used as the carrier gas. (Line 105-107) The location of caption of Fig. 2 has been revised from left to the center. The caption of Fig. 4 was revised as “TG-DTG analysis of EX with/without catalyst”. Fig.6. was revised as Fig. 6. Fig. 7 and Fig. 8 have been renumbered in the revised manuscript.

Reviewer 2 Report

The introduction should include what is the impact and novelty of this study. Who will benefit from such a study and why it is important? These issues should be clarified in the introduction, but perhaps also in the abstract.

 

One would expect that Fig.5 would show a higher mass loss in a higher temperature range. Can you delve a bit more on this issue and support your answer with specific literature references?

 

Kinetic analysis section should include the modeling part (equations, solving methodology, parameter estimation and comparison with literature). It is not clear what the different activation energy presents? Activation energy is unique, if there are variations then this is attributed to certain phenomena that need to be listed. Please provide a concrete kinetic analysis with all details needed .  Otherwise, this paper cannot proceed further.

 

 

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The authors imrpoved significantly their manuscript.