Cracking of hydrotreated waste fats and oils over zeolites for renewable propene production. Part I: Cracking of n-paraffinic intermediates derived from the Hydroprocessed Esters and Fatty Acids (HEFA) process.
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| Title: | Cracking of hydrotreated waste fats and oils over zeolites for renewable propene production. Part I: Cracking of n-paraffinic intermediates derived from the Hydroprocessed Esters and Fatty Acids (HEFA) process. |
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| Authors: | Martí, Ferran Torres1 (AUTHOR), Mathieu, Yannick1 (AUTHOR) matyansi@upv.edu.es, Corma, Avelino1 (AUTHOR) acorma@itq.upv.es |
| Source: | Applied Catalysis B: Environment & Energy. Feb2026, Vol. 381, pN.PAG-N.PAG. 1p. |
| Subjects: | Catalytic cracking, Propene, Zeolites, Alkenes, Acid catalysts, Waste recycling, Renewable natural resources |
| Abstract: | Waste vegetable oils and animal fats have emerged as promising renewable feedstocks for the sustainable production of light olefins. In this work, we highlight the potential of applying catalytic cracking to Hydroprocessed Esters and Fatty Acids (HEFA) derived paraffins, as a selective route toward green light olefins. By optimizing the combination of catalyst and reaction conditions, we demonstrate the feasibility of achieving up to 90 % total olefins and 47 % propylene yield through the direct catalytic cracking of HEFA-derived hydrotreated n-paraffinic intermediates. The thermodynamics and kinetics of primary and secondary reactions, including endothermic and exothermic behaviors as well as uni- and bimolecular mechanisms, have been optimized by employing zeolitic catalysts with tailored micropore dimensions, topology, hierarchical porosity, and framework composition. Key factors such as the pre-determined location of acid sites and the presence of secondary porosity were also considered. Furthermore, catalytic performance has been enhanced by recycling a selected fraction of the products within the same reactor, significantly intensifying the production of the desired light olefins. [Display omitted] • HVO can be selectively cracked to light olefins using proper acid catalysts. • ZSM-5, Hierarchical IM-5 and ZSM-12 zeolites emerge as the more selective catalysts. • Optimized conditions yield 66 % light olefins, 34 % propylene in one pass. • C5 + recycling boosts yields to 91 % light olefins and 47 % propylene. • ZSM-5 stands out as the most stable catalyst under cracking conditions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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