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ankang276

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Clearly, there was no significant change in the zeolite micropore
size distribution upon addition of Mg, although there was a small
reduction in micropore volume (Table 1).The pore size distribution data
of Fig. 2 shows the reduced volume associated with the mesopores in the
range 30¨C50 Å for the 2%Mg¨CMo2C/HY compared to the Mo2C/HY and the
HY alone. Together these data suggest that the MgO/K2O (the metal oxides
formed during calcination) are located throughout the zeolite mesopores
outside of the zeolite micropores. The size of the Mo2Ccrystallites
(Table 1) confirm that the Mo2C was located outside of the zeolite
micropores and so the reduction in the micropore volume must be due
to pore-mouth blocking by Mo2C or MgO/K2O crystals.

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