CO2 utilization for aromatics synthesis over zeolites

Abstract

Aromatic hydrocarbons are essential petrochemical intermediates traditionally produced through naphtha reforming, where feedstock costs account for a substantial portion of total manufacturing expenses. Expanding the range of raw materials for aromatics production is therefore highly desirable. The direct utilization of CO₂ or co-conversion with the abundant light alkanes from shale gas to produce aromatic hydrocarbons has both environmental and economic advantages in terms of reducing greenhouse gases and aromatics production costs. In this perspective, we have reviewed two CO₂-based pathways for aromatics synthesis over zeolites: direct CO₂-to-aromatics conversion, and CO₂-oxidative dehydrogenation and aromatization pathways. CO₂ utilization for aromatics synthesis was discussed from the viewpoints of catalyst components, active sites, and the role of CO₂ in reaction mechanisms, as well as aromatics selectivity regulation. Lastly, we proposed the challenges and opportunities that lie ahead for advancing aromatics production with the utilization of CO₂.