Process for interconversion of olefins with modified beta zeolite

A method for interconverting olefins in an olefin-rich hydrocarbon stream, the method comprising:

• contacting the olefin-rich hydrocarbon stream with a catalyst system in an olefin interconversion unit to produce an interconverted effluent comprising ethylene and propylene, wherein the contacting is conducted at a reaction temperature from 450° C. to 750° C., a reaction pressure from 1 bar to 5 bar, and a residence time from 0.5 seconds to 1000 seconds,
• wherein:
• the olefin-rich hydrocarbon stream is a hydrocarbon stream containing at least 20% by mass olefins, based on the total mass of the hydrocarbon stream;
• the catalyst system comprises a framework-substituted beta zeolite;
• and
• the framework-substituted beta zeolite has a modified *BEA framework, the modified *BEA framework comprising a *BEA aluminosilicate framework modified by substituting a portion of framework aluminum atoms of the *BEA aluminosilicate framework with beta-zeolite Al-substitution atoms independently selected from the group consisting of titanium atoms, zirconium atoms, and hafnium atoms.