Please suggest an effective catalytic route for removing carbon dioxide from our SMR hydrogen?

Response to a question in the Catalysis 2021 Q&A feature

Tom Ventham
Unicat BV / G. W. Aru.

Article Summary

Tom Ventham, Sales & Technical, Europe and Africa, Unicat / G. W. Aru - tom.ventham@gwaru.com
Hydrogen production is a complex, multi-unit process that must be optimised through the design phases to operation, to ensure it fulfils the objectives set out. Carbon dioxide is a by-product of SMR reforming reactions. Carbon dioxide is also generated through the water gas shift reaction taking place in HTS, MTS, or LTS reactors to increase hydrogen yield.

Post-processing of the SMR CO2 rich stream will either happen using a PSA system to purify the hydrogen product and release CO2 as purge gas typically routed to the reformer furnace or fuel gas network, or a methanator to catalytically react CO and CO2 to methane using a nickel or ruthenium based catalyst. In ammonia plants and other larger syngas production units, a Benfield system can be found to remove CO2 from the syngas stream. In terms of a purely catalytic route, the methanator catalysts Unicat can offer as part of the MC-range are an attractive solution to refiners looking to remove carbon dioxide from the SMR hydrogen stream.

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