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Open AccessArticle

Influence of the Brønsted Acidity on the Ring Opening of Decalin for Pt-USY Catalysts

Instituto de Química, Laboratório de Peneiras Moleculares (LABPEMOL), Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
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Author to whom correspondence should be addressed.
Catalysts 2019, 9(10), 786; https://doi.org/10.3390/catal9100786
Received: 5 August 2019 / Revised: 20 August 2019 / Accepted: 21 August 2019 / Published: 20 September 2019
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
A challenging hot topic faced by the oil refinery industry is the upgrading of low-quality distillate fractions, such as light cycle oil (LCO), in order to meet current quality standards for diesel fuels. An auspicious technological alternative entails the complete saturation of the aromatic structures followed by the selective cleavage of endocyclic carbon-carbon bonds in the formed naphthenic rings (selective ring opening—SRO). This work reports the influence of Brønsted acid sites of platinum-ultra stable Y zeolite (Pt-USY) catalysts in the SRO of decalin as a model naphthenic feed. A maximum combined yield to selective ring opening products (ROP: C10-alkylcycloalkanes + OCD: C10-alkanes) as high as 28.6 wt% was achieved for 1.6Pt-NaUSY-im catalyst. The molar carbon distribution curve of the hydrocracked (C9-) products varied from M-shaped for 1.4Pt-USY-im catalyst, indicating mainly C–C bond cleavage of the ring opening products with one remaining naphthenic ring via carbocations and the paring reaction, to not M-shaped for the 1.6Pt-NaUSY-im catalyst, where carbon-carbon bond cleavage occurs preferentially through a hydrogenolysis mechanism on metal sites. High (hydro)thermal stability and secondary mesoporosity of the 1.6Pt-NaUSY-im catalysts make this system highly prospective for upgrading low-quality real distillate feeds. View Full-Text
Keywords: ring opening; decalin; Pt-USY catalysts; Brønsted acidity ring opening; decalin; Pt-USY catalysts; Brønsted acidity
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MDPI and ACS Style

Oliveira Soares, L.W.; Castellã Pergher, S.B. Influence of the Brønsted Acidity on the Ring Opening of Decalin for Pt-USY Catalysts. Catalysts 2019, 9, 786.

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