Abstract
A series of amorphous SiO2-Al2O3 composites oxides with varying content of SiO2 were prepared by sol-gel method and used as the supports of Rh-based catalysts. The as-prepared catalysts were evaluated in the cracking reaction of methycyclohexane at high temperature of 600–750°C and high pressure of 4MPa. It was found that Rh/SiO2-Al2O3 catalysts exhibited better cracking activity than thermal cracking in parallel operating conditions. That was in good consistent with a substantial increment of strong Lewis acid sites in these Rh/SiO2-Al2O3 catalysts. Furthermore, catalytic activity of these Rh-supported catalysts greatly depended on the content of SiO2, which firstly increased with the content of SiO2, till 60wt.%, and then declined when SiO2 occupied the overwhelming majority (85wt.% and 100wt.%) in the catalysts. Particularly, Rh/S60 (the mass fraction of SiO2 is 60wt.%) achieved the best catalytic performance with regard to the gas yield, methycyclohexane conversion and heat sink which was respectively increased by 56.1%, 16.0%, 0.28MJ/kg in comparison to thermal cracking at 675°C.
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