<p>The accumulation of waste plastics in both terrestrial landfills and marine environments has escalated into a significant environmental concern. An innovative and sustainable approach is introduced by converting such refuse into valuable fuels. This study elucidates the development of Kanshablite A (FeO₆ AlO₆PO₄ AlPO₄), a novel catalyst synthesized through a straightforward sol–gel method utilizing tetraethylenepentamine (TEPA) as a structuring agent. Through X-ray diffraction (XRD) analysis, a new hybrid crystalline architecture comprising cubic (FeO₆), orthorhombic (AlO₆PO₄), and monoclinic (AlPO₄) phases was confirmed. The structural characteristics revealed a mesoporous nature with a pore diameter of 12.5&#xa0;nm and a Brunauer–Emmett–Teller (BET) surface area of 188.8&#xa0;m²&#xa0;g⁻¹, making it amenable to catalytic applications. Subsequent investigations employing Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), ultraviolet–visible diffuse reflectance spectroscopy (UV-DRS), and high-resolution transmission electron microscopy (HRTEM) confirmed the existence of Fe²⁺ within an octahedral coordination in the cubic FeO₆ phase, alongside notable thermal stability and well-defined porosity. Kanshablite A demonstrated remarkable catalytic performance in the degradation of polypropylene (PP) and low-density polyethylene (LDPE) mixtures, achieving 100% conversion efficiency coupled with favorable selectivity for liquid hydrocarbons. The physicochemical properties of the produced liquid fuel closely resembled those of commercial diesel, characterized by either wax formation or minimal gaseous by-products and carbon residues. Owing to its distinctive structural attributes, extensive surface area, and extraordinary catalytic efficiency, Kanshablite A holds significant potential as a sustainable catalyst for the efficient transformation of waste plastics into economically valuable liquid fuels.</p> Graphical abstract <p></p>