Exploring the pyrolysis of tar-rich coals under the catalysis of cerium-modified magnetic core-shell HZSM-5

Authors

ZHOU Anning, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an 710021, ChinaFollow
ZHANG Zhi, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
CHEN Yongan, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
ZHANG Huaiqing, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
BAI Zhuangwei, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
SHI Zhiwei, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an 710021, China
HE Xinfu, School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an 710021, China

Abstract

Objective Tar-rich coals are valuable resources integrating coal, tar, and gas properties. Catalytic pyrolysis serves as a significant approach for achieving green and low-carbon development of tar-rich coals. However, the research and development of efficient and recyclable catalysts for the pyrolysis of tar-rich coals remains highly challenging. Methods With HZSM-5@SiO₂@MgFe₂O₄ (HSMF) as the raw material, this study prepared HZSM-5@SiO₂@MgFe₂O₄ (mHSMF) with a hierarchical porous structure using the hydrothermal method and alkali modification, followed by the preparation of cerium-modified mHSMF (5-CeO₂/mHSMF) using the precipitation method. Employing a fixed-bed reactor, this study investigated the regulatory effects of 5-CeO₂/mHSMF on the pyrolysis products of tar-rich coals from the Shenfu block, along with the anti-carbon deposition performance of 5-CeO₂/mHSMF. Results and Conclusions The results indicate that the CeO₂-based modification of HSMF was conducive to the formation of a hierarchical porous structure comprising micropores and mesopores on the surface of HSMF. Through pyrolysis at 650°C in the N₂ atmosphere for 1 hr using 5-CeO₂/mHSMF as a catalyst, the coals exhibited a tar yield of 13.38%, equivalent to a tar yield of 176% in the Gray-King assay. Compared to the pyrolysis of raw coals, the catalytic pyrolysis exhibited increases in the aliphatic-hydrocarbon and benzene-compound contents in tar of 3.04% and 3.07%, respectively and an increase in the H₂ and CH₄ content in coal gas of 10.49%. Through CeO₂-based modification, the catalyst enhanced the anti-carbon deposition performance by 86.1%, with carbon deposits of merely 11.60 mg/g and tending to form a stable graphitized structure. Overall, 5-CeO₂/mHSMF manifests significant regulation of the distribution and composition of the products from the catalytic pyrolysis of coals in the Shenfu block, along with encouraging anti-carbon deposition performance and magnetic recyclability.

Keywords

tar-rich coal, pyrolysis, magnetic catalyst, cerium-based modification, anti-carbon deposition, oil and gas quality improvement

DOI

10.12363/issn.1001-1986.24.01.0003

Recommended Citation

ZHOU Anning, ZHANG Zhi, CHEN Yongan, et al. (2024) "Exploring the pyrolysis of tar-rich coals under the catalysis of cerium-modified magnetic core-shell HZSM-5," Coal Geology & Exploration: Vol. 52: Iss. 7, Article 15.
DOI: 10.12363/issn.1001-1986.24.01.0003
Available at: https://cge.researchcommons.org/journal/vol52/iss7/15

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