期刊
NEW JOURNAL OF CHEMISTRY
卷 45, 期 8, 页码 3809-3816出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj04961a
关键词
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资金
- National Key R&D Program of China [2018YFE0111000]
- Natural Science Foundation of Guangdong Province of China [2019A1515011971, 2017A030310280]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA 21050400]
- Youth Innovation Promotion Association CAS [2020345]
The hierarchical zeolites doped with different amounts of Ga element were successfully synthesized via an isometric impregnation method. The addition of Ga increased Brønsted-Lewis (B + L) acids, leading to improved benzene, toluene, and xylene (BTX) selectivity and anti-coking properties. The 2%Ga-ZSM-5/SBA-15 zeolite composite showed the best BTX catalytic selectivity, with a BTX yield of 25.52%, demonstrating its potential for practical applications in BTX production and petrochemical industries.
Hierarchical zeolites are promising for the development of biomass catalytic fast pyrolysis; composite molecular sieves with efficient catalytic activity are needed to expand their practical applications. Micro-mesoporous ZSM-5/SBA-15 composite molecular sieves doped with different amounts of Ga element were successfully synthesized via an isometric impregnation method. The physical structures of the prepared materials were characterized by energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and pyrolysis infrared spectroscopy. Based on these analyses, Ga was distributed uniformly on the surface of the composite molecular sieve catalyst. As Ga loading increased, Bronsted-Lewis (B + L) acids increased. Pyrolysis of rice hull was performed using a multi-function catalyst evaluation device and catalytic performance and anti-coking performance were evaluated. Ga-modified ZSM-5/SBA-15 showed better benzene, toluene, and xylene (BTX) catalytic selectivity and anti-coking properties compared to those of undoped catalysts. Additionally, the 2%Ga-ZSM-5/SBA-15 zeolite composite showed the best BTX catalytic selectivity, with a BTX yield of 25.52%, clearly demonstrating its potential for application in BTX production and practical uses in petrochemical industries.
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