You can even pyrolyse methane, and the result us pure hydrogen and pure carbon. This is a side reaction to the most commonly process used to produce acetylene f

You can even pyrolyse methane, and the result us pure hydrogen and pure carbon. This is a side reaction to the most commonly process used to produce acetylene from methane, and this can be tuned to produce mostly carbon and hydrogen. The disadvantage of this method is that it is less economical, since only half the hydrogen is produced per unit of methane compared to steam reforming.