Catalyst system and process for chemically treating a carbon-containing feedstock using the catalyst system

A process for chemically treating a carbon-containing feedstock, the process comprising:

• contacting the carbon-containing feedstock with a hydrogen-containing stream in the presence of a catalyst system, the catalyst system comprising:
• (a) at least one transition metal or transition metal sulfide supported on an oxide-containing support having a low acidity, and
• (b) an acidic zeolite,
• to produce an alkane-containing product stream.

A process for depolymerizing a polymer-based feedstock, comprising:

• reacting a polymer-based feedstock with a hydrogen-containing stream in the presence of a catalyst system, the catalyst system comprising:
• (a) at least one transition metal or transition metal sulfide supported on an oxide-containing support having a low acidity, and
• (b) an acidic zeolite,
• to depolymerize the polymer-based feedstock and form an alkane-containing product stream.

A method for selectively converting a polymer-based feedstock to a liquid naphtha product, comprising:

• reacting a polymer-based feedstock with a hydrogen-containing stream in the presence of a catalyst system comprising:
• (a) at least one transition metal or transition metal sulfide supported on an oxide-containing support having a low acidity, and
• (b) an acidic zeolite,
• to depolymerize the polymer-based feedstock and form a liquid naphtha product containing at least 50% by weight of C4-C12 hydrocarbons;
• less than 10% by weight of solid product stream;
• and optionally less than 10% by weight of diesel or kerosene product,
• wherein the reaction temperature ranges from about 300-450° C. and hydrogen pressure ranges from about 5 to 100 bar.