Abstract
To improve the catalytic activity of zeolites in cracking of petroleum components for the production of light olefins, ZSM-5–USY composite catalysts modified with transition metals (e.g. Nb, Ni, or W) have been synthesized by an impregnation method. The catalytic performance of the obtained catalysts in the cracking of n-hexane as a model compound of petroleum for the production of light olefins has been evaluated using a fix-bed reactor. The Nb-modified composite zeolite has shown an excellent catalytic activity. The optimal Nb loading for the composite catalyst is 1.5% (1.5% Nb/Z–Y) that provides the highest amount of acid sites. The yield up to 50% and the selectivity up to 68% of the C2–C4 olefins have been achieved at 650°C. The kinetic study of the catalytic n-hexane cracking on 1.5% Nb/ZSM-5–USY has characterized it as the first-order reaction with the apparent activation energy of 115.16 kJ/mol.
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ACKNOWLEDGMENTS
The study was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences “Transformational Technologies for Clean Energy and Demonstration” (project no. XDA21031102), the Innovation Academy for Green Manufacture of the Chinese Academy of Sciences (project nos. IAGM2019A12, IAGM2022D15), CAS Pioneer Hundred Talents Program, and K. C. Wong Education Foundation (project no. GJTD-2018-04).
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Zhang, Y., Jiao, N., Wang, H. et al. Excellent Activity of Nb in Promoting Performance of ZSM-5–USY for the Catalytic Cracking of n-Hexane to Light Olefins. Pet. Chem. 63, 718–729 (2023). https://doi.org/10.1134/S0965544123050043
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DOI: https://doi.org/10.1134/S0965544123050043