There is provided with the present invention a new process for up grading products resulting from the steam cracking of hydrocarbons which comprises bringing 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 {HEAD ~ 75 to 85% wt} of a Zn ZSM 5 zeolite or {TAIL ~ a Zn ZSM 5 zeolite/asbestos} and recovering the desired products 
of
There is provided with the present invention a new process for up grading products resulting from the steam cracking of hydrocarbons which comprises bringing 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 { HEAD ~ 75 to 85 % wt } of a Zn ZSM 5 zeolite or { TAIL ~ a Zn ZSM 5 zeolite / asbestos } and recovering the desired products
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