Producing hydrogen from hydrogen sulfide

A system comprising:

• a first heat transfer vessel configured to heat a feed stream to a preheat temperature, the feed stream comprising hydrogen sulfide;
• a catalytic reactor downstream of the first heat transfer vessel, the catalytic reactor configured to receive at least a portion of the feed stream from the first heat transfer vessel, the catalytic reactor comprising a catalyst, the catalytic reactor configured to contact the portion of the feed stream with the catalyst, the catalyst configured to, in response to contact with the portion of the feed stream, convert at least a portion of the hydrogen sulfide in the portion of the feed stream into hydrogen and sulfur to form a mixed product stream, the catalytic reactor configured to discharge the mixed product stream, the mixed product stream comprising the hydrogen, the sulfur, and a remaining, unconverted portion of the hydrogen sulfide, wherein the preheat temperature is a temperature that is sufficiently high to maintain a desired reaction temperature within the catalytic reactor;
• and
• a second heat transfer vessel downstream of the catalytic reactor, the second heat transfer vessel configured to receive the mixed product stream, the second heat transfer vessel configured to cool the mixed product stream to a specified temperature at which recombination of the hydrogen and the sulfur into hydrogen sulfide is prevented.