Carbon Capture Utilization and Storage in Methanol Production Using a Dry Reforming-Based Chemical Looping Technology

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Date
2022
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American Chemical Society
Abstract

This further investigates the concept of gas switching dry reforming (GSDR) that efficiently converts the two major greenhouse gases (CO2 and CH4) into a valuable product (syngas) for gas-to-liquid (GTL) syntheses. The proposed GSDR is based on chemical looping technology but avoids external circulation of solids (metal oxides) by alternating the supply of reducing and oxidizing gas into a single fluidized bed reactor to achieve redox cycles. Each cycle consists of three steps where a metal oxide/catalyst is first reduced using GTL offgases to produce CO2 (and steam) that is supplied to the next reforming step to produce syngas for GTL processes. The metal oxide is then reoxidized in the third step associated with heat generation (through the exothermic oxidation reaction of the metal oxide and air) to provide the heat needed for the endothermic dry methane reforming step. Experimental demonstrations have shown that a syngas H-2/CO molar ratio between 1 and 2 suitable for methanol production could be achieved. A further demonstration shows that pressure has negative effects on gas conversion. Following the successful experimental campaign, process simulations were completed using ASPEN to show how the GSDR process can be integrated into a methanol (MeOH) production plant.

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Keywords
INTEGRATED CO2 CAPTURE, GAS SWITCHING COMBUSTION, SYNGAS PRODUCTION, HYDROGEN-PRODUCTION, TECHNOECONOMIC ASSESSMENT, OXYGEN CARRIER, REACTOR, GENERATION, DIOXIDE, STEAM, Energy & Fuels, Engineering, Chemical
Citation
Ugwu, A., Osman, M., Zaabout, A., & Amini, S. (2022). Carbon Capture Utilization and Storage in Methanol Production Using a Dry Reforming-Based Chemical Looping Technology. In Energy & Fuels (Vol. 36, Issue 17, pp. 9719–9735). American Chemical Society (ACS). https://doi.org/10.1021/acs.energyfuels.2c00620