n -Heptane and methylcyclohexane transformation over a HMCM-22 zeolite. Origin of the features typical of large-or of medium-pore zeolites |
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| Authors: | Patrícia Matias José Manuel Lopes Sébastien Laforge Patrick Magnoux Michel Guisnet and Fernando Ram?a Ribeiro |
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| Institution: | (1) IBB - Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;(2) Laboratoire de Catalyse en Chimie Organique, 40 Av. du Recteur Pineau, 86022 Poitiers, France |
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| Abstract: | The main features of methylcyclohexane (mch) and n-heptane (n-C7) transformation at 350°C were compared for fresh samples of HMWW, HMFI and HFAU zeolites. With both reactions, the behavior
of HMWW was between those of the medium HMFI and large pore HFAU zeolites. Thus, the values of turnover frequency (TOF) and
of the TOFmch/n-C7 ratio were similar with HMWW and HMFI and much higher with HFAU. In contrast, small differences were found between product
distributions over HMWW and HFAU but large differences between HMWW and HMFI. These observations can be explained by alkane
transformation in the large supercages with 10-MR apertures of HMWW: the narrow apertures limit diffusion of the mch within
the supercages, but not the diffusion of the products which are therefore typical of the transformation within large cages
hence without any steric limitation. |
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| Keywords: | H-MCM-22 H-USY H-MFI methylcyclohexane and n-heptane cracking |
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