3D ordered mesoporous Fe-KIT-6 catalysts for methylcyclopentane (MCP)

R.Merkache^a, I. Fechete^a*, M.Maamache^b, M.Bernard^c,d, P. Turek^c,d, K. Al-Dalama^e, F. Garin^a

^aInstitut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé -ICPEES, UMR 7515 CNRS, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France

^b Laboratoire de Physique Quantique et Systí¨mes Dynamiques, Département de Physique, Université Ferhat Abbas Sétif 1, Sétif 19000, Algeria

^cInstitut de Chimie, UMR 7177 CNRS - Université de Strasbourg, 1 rue Blaise Pascal, 67008 Strasbourg cedex, France
^d Fondation IcFRC International Center for Frontier Research in Chemistry, 8 allée Gaspard Monge, F-67000 Strasbourg, France

^e Petroleum Refining Department, Petroleum Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait

Abstract

The ring-opening selectivity of naphthenic compounds is one of the most viable methods for producing transportation fuels high octane / cetane from crude oil. The ring opening of MCP has been the subject of our work on new catalysts (Fe, Ni, and Zn) supported on the mesoporous framework KIT-6 with Ia3d cubic symmetric in an effort to substitute the precious metals. The catalysts were tested at temperatures between 200 and 500 ° C under H2 for 4 h at 500°C. These catalysts were synthesized by different methods of preparations and characterized by XRD, N2 adsorption/desorption isotherms, FT-IR, and EPR spectroscopy.

the isolated  Fe ^{+ 3} ions in tetrahedral coordination and / or octahedral in Mesoporous materials Fe / KIT-6  synthesized by the self assembly method (S + I-) and the grafting method, promote the ring opening reaction of MCP (with the exclusive formation of n-H,) .

The active sites, tetrahedrally coordinated Fe and isolated atomic Fe sites were responsible for the endocyclic C-C bond rupture between substituted secondary-tertiary carbon atoms. At high temperature, the reaction favors the selectivity to cracking and the enlargement of cycle. This result can be attributed to thermodynamic phenomena because aromatization is favored at high temperatures.

This catalyst contained a similar behavior with platinum based catalysts. Our work has made it possible to note that the new catalysts based on oxides supported on the frame KIT-6 may be considered as substituting for precious metals.

[1] D. Teschner, Z. Paal, D. Duprez, Catal. Today 65 (2001) 185.

[2] I. Fechete, B. Donnio, O. Ersen, T. Dintzer, A. Djeddi, F. Garin.applied surface science 257(2011)2791-2800.

[3] A. Boulaoued , I. Fechete , B. Donnio , M. Bernard , P. Turek ,F. Garin.  Microporous and Mesoporous Materials 155 (2012) 131–142.