A process for the production of syngas, the process comprising (i) reacting at least a portion of carbon dioxide with hydrogen within an initial reactor to produce an initial product stream including carbon monoxide, water, unreacted carbon dioxide, and unreacted hydrogen; and (ii) reacting at least a portion of the unreacted carbon dioxide and unreacted hydrogen within a reactor downstream of the first reactor to thereby produce a product stream including carbon monoxide, water, unreacted carbon dioxide, and unreacted hydrogen.

A hydrogen purification system includes a dryer system having a plurality of dryers each having an adsorption bed for drying hydrogen gas configured to adsorb moisture in the adsorption bed from the hydrogen gas in an adsorption mode. The dryer is configured to remove moisture from the adsorption bed in a regeneration mode. The plurality of dryers includes a first dryer group having a first dryer and a second dryer. The hydrogen purification system includes a conduit system configured to connect the plurality of dryers to a hydrogen gas feed and to a hydrogen gas discharge. The first dryer and the second dryer are arranged in parallel in the adsorption mode allowing parallel flow of the hydrogen gas through the first dryer and the second dryer. The first dryer and the second dryer are arranged in series in the regeneration mode allowing series flow of regeneration gas through the first dryer and the second dryer.