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Aromatics with 6 to 9 carbon atoms can be converted catalytically with hydrogen on bifunctional zeolites, such as Pd/H-ZSM-5, into a high-quality steamcracker feed, thereby opening a direct route for the utilisation of surplus pyrolysis gasoline.

A “cracking” good performance: Cycloalkanes, which are easily accessible from the surplus aromatic products of petrochemistry, can be converted under hydrogen into a steamcracker feed consisting mainly of n‐alkanes. The highest yields are obtained on zeolite H‐ZSM‐5 with tiny amounts of noble metals—a catalyst with a new type of cracking performance.

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