Enrichment of Aromatic Hydrocarbon from Hydrotreated Light Coker Gas Oil over a Bimetallic Zeolite Catalyst

This study introduces a catalytic process to maximize aromatic compounds, especially BTX, from low-value light coker gas oil (LCGO), a viable feedstock for petrochemicals. This aligns with the concept of converting crude oil to chemicals.

Abstract

In order to address the crude-to-chemicals concept, it is imperative to transform low-value refinery streams into high-value petrochemicals. In this regard, the enhancement of aromatic hydrocarbons, particularly BTX from light coker gas oil (LCGO), is a critical step for future petrochemical complexes. A key aspect of this study was the development of a catalytic process to produce aromatics through successive hydrotreating followed by reforming of light coker gas oil (LCGO). A ZnCo-based bifunctional zeolite catalyst shows >73% paraffin conversion with 52.1% light aromatics selectivity. The study of the local structure and surface characteristics of the bimetallic catalyst reveals significant metal–support interactions, along with the presence of spinel phases in conjunction with ZnO and Co₃O₄. Additionally, ZnCo/ZSM-5 catalysts demonstrate superior acidity and an optimal balance of medium-strength Brønsted acid sites and high Lewis acid sites, which likely account for the improved BTX selectivity and reduced coke formation.

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