Abstract
The hydroconversion of normal renewable diesel fractions appears as a pivotal process in the production of bio-fuel derived from lipids. The adaptability of bio-fuel product distribution to align with market demand necessitates the utilization of catalysts with superior performance in long-chain alkane hydroconversion. The hydroconversion performance of the model compound hexadecane over Pt/SAPO-11 catalysts was comprehensively investigated. The accessibility α of B acidity in Pt/SAPO-11 catalysts was determined using Py and DMPy-IR, and its impact on hexadecane hydroconversion was addressed. This study revealed that the shape selectivity mechanism in long-chain alkane hydroconversion on Pt/SAPO-11 catalysts involves the combination of the transition state and product shape selectivity catalysis. Pt/SAPO-11-S1, with the largest accessibility factor α, reached unprecedented maximum yield levels of 68 %, 87 %, and 37 % for multibranched C16H34 isomers, total C16H34 isomers, and jet fuel fractions, respectively. Additionally, Pt/SAPO-11-S1 exhibited excellent performance for isomerization and jet fuel production in actual renewable diesel hydroconversion. It demonstrates the potential of Pt/SAPO-11 catalysts featuring accessible B acidity in renewable diesel hydroconversion.
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