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Impact of the Desilication Treatment of Y Zeolite on the Catalytic Cracking of Bulky Hydrocarbon Molecules

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Abstract

Mesoporosity was induced on a USY zeolite by means of an alkaline leaching process. Samples were immersed in 0.05, 0.10 and 0.20 M NaOH solutions during 15 min at room temperature and then were exchanged with NH4 + ions and calcined to yield the acid forms. The formation of mesopores with size ranging from 20 to 100 Å increased with the concentration of NaOH. The modified zeolites were used at 30 wt% to formulate cracking catalysts with an inert SiO2 matrix. The catalytic performance of these catalysts in the conversion of 1,3,5-tri-isopropylbenzene was evaluated in a batch, fluidized bed reactor at 450, 500 and 530 °C, with a catalyst to oil relationship of 4.7 and contact times up to 16 s. The catalysts with the modified zeolites were more active in the cracking of these bulky molecules than the one with the parent, unmodified zeolite; moreover, the selectivity to the products of primary cracking reactions increased. These results reveal an enhanced diffusion of the reactant molecules to the zeolite active sites and of the products out of the catalyst particles.

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Acknowledgments

This work was performed with the financial assistance of University of Litoral (Santa Fe, Argentina), Secretary of Science and Technology, Proj. CAID 2011 #501-201101-00546LI; The National Scientific and Technological Research Council, PIP 1257/09 and the National Agency for Scientific and Technological Promotion, PICT 2010/2123.

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  1. Instituto de Investigaciones en Catálisis y Petroquímica INCAPE (FIQ, UNL –CONICET), Colectora Ruta Nac. Nº 168 km 0 - Paraje El Pozo, 3000, Santa Fe, Argentina

    Juan Rafael García, Marisa Falco & Ulises Sedran

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  1. Juan Rafael García
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  2. Marisa Falco
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  3. Ulises Sedran
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Correspondence to Ulises Sedran.

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García, J.R., Falco, M. & Sedran, U. Impact of the Desilication Treatment of Y Zeolite on the Catalytic Cracking of Bulky Hydrocarbon Molecules. Top Catal 59, 268–277 (2016). https://doi.org/10.1007/s11244-015-0432-7

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