The production of hydrogen by the reforming of methanol was studied in a continuously operated
tubular reactor made of the nickel-based alloy Inconel 625. Experiments were performed at
pressures from 25 to 45 MPa and temperatures in the range of 400−600 °C. The concentration
of the aqueous feed varied from 5 to 64 wt % methanol. Residence times under reaction
temperature conditions varied in the range from 3 to 100 s. The main component of the product
gas is hydrogen, with smaller amounts of carbon dioxide, carbon monoxide, and methane.
Methanol conversion is up to 99.9% without addition of a catalyst. Obviously, the heavy metals
on the inner surface of the reactor influence the composition of the product gas and the conversion
rate. Oxidation of the reactor inner surface before gasification turned out to enhance the reaction
rate and to decrease the carbon monoxide concentration.
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