Abstract
The effect modifying the HZSM-5 zeolite contained in a bizeolite catalyst has on the conversion of hydrotreated vacuum gas oil, vegetable oil, and a vacuum gas oil–vegetable oil mixture under conditions of catalytic cracking is investigated. It is found that modification lowers both the specific surface area and the volume of the meso- and micropores of HZSM-5 zeolite; the higher the phosphorus content, the greater the reduction in the main characteristics of the pore structure of the zeolite. A drop in the total acidity of P/HZSM-5 and a quantitative redistribution of weak and medium-strength acid sites are also observed. Catalytic tests of the zeolites in the cracking process show that phosphorus modification helps increase the total yield of propane–propylene and butane–butylene fractions with high olefin contents. Alkaline treatment of HZSM-5 zeolite with a high SiO2/Al2O3 ratio facilitates the extraction of silicon and increases the specific surface area of mesopores considerably. In addition, weakening of the strong acid sites of the zeolite and/or a change in the accessibility of these sites due to the partial removal of silicon is observed.
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ACKNOWLEDGMENTS
This work was performed as part of a State Task for the Institute of Hydrocarbon Processing, Siberian Branch, Russian Academy of Sciences under the Program for Basic Research of the State Academies of Sciences, 2013–2020, directive V.47, project no. V.47.1.3, state registration in the Unified State Information System for Recording the Results of Research and Development Works no. AAAA-A17-117021450099- 9).
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Doronin, V.P., Lipin, P.V., Potapenko, O.V. et al. Modifying Zeolite ZSM-5 to Increase the Yield of Light Olefins in Cracking Feedstocks of Petroleum and Vegetable Origin. Catal. Ind. 10, 335–343 (2018). https://doi.org/10.1134/S2070050418040050
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DOI: https://doi.org/10.1134/S2070050418040050