ORIGINAL RESEARCH
Study on the Preparation of Hydrogen-Rich Fuel Gas from Mixed Pyrolysis of Coal by Alkaline Earth Metal Oxide Supported γ-Al2O3 Catalyst
Chen Jihao 1,2,3
,
 
Xia Fei 1,3
,
 
Li Yue 1,2,3
,
 
Li Juan 1,3
,
 
Tong Meng 1,3
 
 
 
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1
Shaanxi Coal Geological Engineering Technology Co., Ltd., Xi’an 710054,China
2
Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an, 710021, China
3
Shaanxi Coal Geological Laboratory Co., Ltd., Xi’an, 710054, China
CORRESPONDING AUTHOR
Chen Jihao   

Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, China
Submission date: 2021-04-03
Final revision date: 2021-09-02
Acceptance date: 2021-09-10
Online publication date: 2022-05-16
Publication date: 2022-06-20
 
Pol. J. Environ. Stud. 2022;31(4):3121–3129
 
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ABSTRACT
In this experiment, γ-Al2O3 was used as the carrier, and the alkaline earth metal oxide supported γ-Al2O3catalyst was prepared by an equal volume impregnation method. The coal sample and the catalyst were mixed and pyrolyzed through a fixed pyrolysis bed to produce hydrogenrich fuel gas and tar. The effects of pyrolysis conditions on hydrogen rich fuel gas components and tar were studied by changing the final pyrolysis temperature (450ºC, 500ºC, 550ºC, and 600ºC) and constant pyrolysis time (3 min, 5 min, 10 min and 15 min); MgO, CaO, SrO and BaO were used as active components, and the alkaline earth metal oxide supported γ-Al2O3catalyst was prepared and roasted by muffle furnace, and then the effects of alkaline earth metal oxides on hydrogen rich fuel gas components and tar were studied. The catalyst was characterized by XRD and BET, and the pyrolysis mechanism of coal and catalyst was studied. The results show that: (1) When the final temperature was 600ºC, the maximum tar was 0.32g, and the maximum gas was 1.44g. The CH4 content was the largest from 450ºC to 550ºC, and the hydrogen content was the maximum at 600ºC. (2) The content of hydrogen at the final temperature 600ºC was the highest, and the oil yield was basically unchanged. (3) SrO/γ-Al2O3and BaO/γ-Al2O3catalyst had a good effect on coal pyrolysis to produce hydrogen rich fuel gas. (4) The specific surface areas of γ-Al2O3and BaO/γ-Al2O3were similar, but the XRD characterization showed that the BaO/γ-Al2O3catalyst contained more BaO active components, so BaO/γ-Al2O3has better catalytic cracking effect.
eISSN:2083-5906
ISSN:1230-1485