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 aromatic synthesis over zeolites: direct CO2-to-aromatics conversion, and CO2-oxidative dehydrogenation and aromatization pathways. The CO2 utilization for aromatics synthesis was discussed from catalyst components, active sites, the role of CO2 in reaction mechanisms, as well as the aromatics selectivity regulation. Lastly, we proposed the challenges and opportunities that lie ahead for advancing aromatics production with the utilization of CO2.