Catalytic pyrolysis of waste plastics using acid catalysts

The catalytic pyrolysis process using acid catalysts with specific microporous materials enhances C2-C4 olefin yield and reduces undesirable by-products, addressing inefficiencies in thermal pyrolysis methods for plastic waste recycling.

WO2026128794A1 Publication Date: 2026-06-18EXXONMOBIL TECHNOLOGY & ENGINEERING CO
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
EXXONMOBIL TECHNOLOGY & ENGINEERING CO
Filing Date
2025-12-12
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing thermal pyrolysis methods for recycling plastic waste are inefficient in producing high yields of olefins, particularly C2-C4 olefins, and result in significant production of undesirable by-products such as aromatics, methane, and coke.

⚗Method used

A catalytic pyrolysis process using an acid catalyst with microporous materials having pore openings between 0.3 nm and less than 0.45 nm, such as zeolites like SSZ-13 and SAPO-34, to convert plastic waste into olefin products with enhanced C2-C4 olefin yields and reduced production of aromatics and methane.

🎯Benefits of technology

The process increases C2-C4 olefin yield by at least 10% while decreasing liquid olefin production by at least 20% compared to thermal pyrolysis, with minimal increases in methane and coke, thereby improving the efficiency of olefin production from plastic waste.

✦ Generated by Eureka AI based on patent content.

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Abstract

Provided herein are catalytic pyrolysis processes for conversion of a plastic waste to an olefin product where at least a portion of the plastic waste is pyrolyzed in the presence of an acid catalyst comprising a microporous material having a pore opening between 0.3 nm and less than 0.45 nm in diameter to form the olefin product comprising a liquid olefin product of C9+ olefin and a gas olefin product of C2 olefin, C3 olefin, and C4 olefin.
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