《Table 2 Analysis of products formed over Mg-MCM-48 catalyst》

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《"Study on Synthesis of Mesoporous M-MCM-48(M=Zr,Mg) and Its Activity for Isomerization of n-Heptane"》

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Notes:1) Including 2-MH and 3-MH；2) Including 2，2-DMP，2，3-DMP，2，4-DMP，and 3，3-DMP；and 3) R-ratio of multibranched to monobranched isoheptanes

In the course of n-heptane isomerization，the analysis of products formed over the Mg-MCM-48 catalyst is demonstrated in Table 2.The products of n-heptane isomerization mainly consisted of 2-MH，3-MH，2，2-DMP，and 2，3-DMP with only a small amount of branched chain products（DMP），while the cleavage products were composed mostly of C3 and C4 alkanes.The ratio of the multi-branched heptane isomers and the mono-branched heptane isomers remained at about 0.8，indicating that the n-heptane hydroisomerization reaction over Mg-MCM-48gave rise to the high-octane gasoline components.The ratio of the multi-branched to the mono-branched isoheptanes trended down with the increase of reaction temperature，denoting that the cracking of multi-branched isomers was easier than that of the mono-branched isomers.Because there are no hydrocarbons having the carbon number more than seven in the cracked products，it is inferred that the isomerization reaction is carried out mainly according to the mechanism of single molecular reaction，rather than the bimolecular reaction mechanism proposed by Blomsma[30].