Dry Reforming of Methane (DRM) is a widely studied reaction which uses CO2
to produce synthesis gas (CO+H2
) with H2
/CO ~ 1. Since the process uses a waste stream (CO2
), this reaction system has received considerable attention from industry and academia like. However, there are still significant challenges in the path of its commercialization. This work addresses the life-cycle analysis viewpoint looking at the overall CO2
balance of the DRM process1
. All major sources of CO2
emissions as well as credits are accounted for based on available greenhouse gas emissions database from GREET. The reformer modeling was based on Gibbs Free Energy Minimization Principle2
. It was found that for the production of high H2
/CO ratio syngas, the DRM process helps in reduction in overall CO2
emissions and operating costs only when coupled with a post-DRM processing step where the excess CO is removed. Without this additional step (which will add to the capital costs), the DRM process produces a low-quality synthesis gas (H2
/CO ~ 1). This synthesis gas has limited utility and hence the DRM process cannot compete with existing established processes of syngas production like Steam Methane Reforming where H2
/CO ratios are above 3. The estimated reduction in terms of CO2
emissions on an industrial scale is presented for the DRM coupled with post-CO removal.
(1) Afzal, S.; Sengupta, D.; Sarkar, A.; El-Halwagi, M. M.; Elbashir, N. O. Optimization Approach to the Reduction of CO2 Emissions for Syngas Production Involving Dry Reforming. ACS Sustain. Chem. Eng. 2018, 6, 7532âˆ’7544.
(2) Noureldin, M. M. B.; Elbashir, N. O.; El-Halwagi, M. M. Optimization and Selection of Reforming Approaches for Syngas Generation from Natural/Shale Gas. Ind. Eng. Chem. Res. 2014, 53 (5), 1841â€“1855.