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Industrial Aplication of Catalytic Systems for n-Heptane Isomerization
Transformation Processes Program, Mexican Petroleum Institute, Pachuca- Cd Sahagún Road km 7.5, Canacintra Industrial Park, Mineral de la Reforma, Hgo. 42186, Mexico
Transformation Processes Program, Mexican Petroleum Institute, Eje Central Lázaro Cárdenas Norte 152, San Bartolo Atepehuacan, México D. F. 07730, Mexico
Chemical Research Center, Hidalgo State University, Pachuca-Tulancingo Road km 4.5, Mineral de la Reforma, Hgo. 42076, Mexico
* Author to whom correspondence should be addressed.
Received: 5 July 2011; Accepted: 12 July 2011 / Published: 14 July 2011
Abstract: The ideal gasoline must have a high pump octane number, in the 86 to 94 range, and a low environmental impact. Alkanes, as a family, have much lower photochemical reactivities than aromatics or olefins, but only the highly branched alkanes have adequate octane numbers. The purpose of this work is to examine the possibilities of extending the technological alternative of paraffin isomerization to heavier feedstocks (i.e., n-heptane) using non-conventional catalytic systems which have been previously proposed in the literature: a Pt/sulfated zirconia catalyst and a molybdenum sub-oxide catalyst. Under the experimental conditions at which these catalysts have been evaluated, the molybdenum sub-oxide catalyst maintains a good activity and selectivity to isomerization after 24 h, while the Pt/sulfated zirconia catalyst shows a higher dimethylpentanes/methylhexanes ratio, probably due to a lower operating temperature, but also a high formation of cracking products, and presents signs of deactivation after 8 h. Though much remains to be done, the performance of these catalysts indicates that there are good perspectives for their industrial application in the isomerization of n-heptane and heavier alkanes.
Keywords: molybdenum sub-oxides; sulfated zirconia; catalyst; n-heptane isomerization; X-ray diffraction; Raman spectroscopy
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Alemán-Vázquez, L.O.; Cano-Domínguez, J.L.; Torres-García, E.; Villagómez-Ibarra, J.R. Industrial Aplication of Catalytic Systems for n-Heptane Isomerization. Molecules 2011, 16, 5916-5927.
Alemán-Vázquez LO, Cano-Domínguez JL, Torres-García E, Villagómez-Ibarra JR. Industrial Aplication of Catalytic Systems for n-Heptane Isomerization. Molecules. 2011; 16(7):5916-5927.
Alemán-Vázquez, Laura Olivia; Cano-Domínguez, José Luis; Torres-García, Enelio; Villagómez-Ibarra, José Roberto. 2011. "Industrial Aplication of Catalytic Systems for n-Heptane Isomerization." Molecules 16, no. 7: 5916-5927.