Environmental considerations have brought about a rapid phaseout of lead additives and a braking of MTBE in gasoline. So the other means such as isomerization of normal alkanes in light naphtha have to be employed to achieve high octane number. Recently, molybdenum oxides (MoO_x) treated in H_2 at 623K-673K has attracted much attention because of the high catalytic activity and selectivity for n-heptane isomerization. Matsuda et al have reported that MoO_x with a maximum porosity around 0.8 nm in diameter obtained from H_2 reduction at 623 K for 12h or longer time was more active and selective for isomerization of n-heptane compared with 0.5wt% Pt/USY zeolite. And they have suggested that the MoO_x possesses a bifunctional property, which is responsible for the higher isomerization activity. In this paper, we report MoO_x and Ni-MoO_x catalysts with meso-porosity maximum distribution used in the n-heptane isomerization reaction.
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