According to EIA, petroleum refineries in the US Gulf Coast rely more and more on merchant suppliers, instead of their own production, to provide the hydrogen used to reduce the sulphur content of fuel. Namely, with the demand for distillate fuel oil increasing, and sulphur content regulations becoming stricter, refineries need to use more hydrogen.
Hydrogen demand is expected to continue to increase as IMO regulations, that limit the sulphur content in marine fuels, apply on January 1, 2020.
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https://safety4sea.com/eia-us-gulf-coast-refinery-hydrogen-demand-met-by-merchant-suppliers/