There is provided with the present invention {HEAD ~ a new process} for up grading products resulting from the steam cracking of hydrocarbons which comprises bringing {TAIL ~ the steam} cracking reaction products in contact with a catalyst comprising a mixture of from 2.5 to 7.5% wt of Cr2 O3, 5 to 17.5% wt of Al2 O3 and 75 to 85% wt of a Zn ZSM 5 zeolite or a Zn ZSM 5 zeolite/asbestos and recovering the desired products 
There is provided with the present invention { HEAD ~ a new process } for up grading products resulting from the steam cracking of hydrocarbons which comprises bringing { TAIL ~ the steam } cracking reaction products in contact with a catalyst comprising a mixture of from 2.5 to 7.5 % wt of Cr2 O3 , 5 to 17.5 % wt of Al2 O3 and 75 to 85 % wt of a Zn ZSM 5 zeolite or a Zn ZSM 5 zeolite / asbestos and recovering the desired products
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