Catalytic conversion of lignite pyrolysis volatiles for enriching light aromatics over B-ZSM-5

被引：0
|
作者：
Yang Z. [1 ]
Cao J. [1 ]
Zhu C. [1 ]
Liu T. [1 ]
Zhao X. [1 ]
机构：
[1] Jiangsu Province Engineering Research Center of Fine Utilization of Carbon Resources (Ministry of Education), China University of Mining & Technology, Xuzhou
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 11期
关键词：
Aromatics; B-HZSM-5; Catalyst; Lignite pyrolysis; Mass transfer; Stability; Zeolites;
D O I：
10.11949/0438-1157.20210973
中图分类号：
学科分类号：
摘要：
Under different alkaline conditions, the B-HZSM-5 (B-H5) catalyst was hydrothermally synthesized to catalyze the pyrolysis of lignite volatiles to produce light aromatics in situ. X-ray diffraction (XRD), scanning electron microscope(Gemini SEM 500), temperature programmed desorption of ammonia (NH3-TPD), and N2 adsorption-desorption were used to characterize the morphology, acidity and textural properties of xB-HZSM-5. The higher weak acid content and the higher crystallinity of Na-xB-H5(added NaOH) were obtained under a stronger alkaline solution. Compared with parent ZSM-5, the weak acidity assigned to the B-OH-Si groups of Na-xB-H5 provided more active sites to absorb ethylene and propylene to promote methylation and alkylation processes. The highest alkylbenzene yield was obtained (11.4 mg/g) over Na-0.69B-H5 (B content was 0.69 g) with higher crystallinity, sufficient active sites and hierarchical micro/mesopore. However, the excess B also brought a negative effect on aromatization due to the reduced rate of stronger acid and weak acid. The Na-xB-H5 provided a great prospect to enhance the catalyticperformance of lignite vapors by the introduction of B in the framework of H5. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：5633 / 5642
页数：9
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