Solid-oxide fuel cells can operate on light hydrocarbons such as propane and methane without a reformer, or can run on higher hydrocarbons with only partial reforming, but the high temperature and slow startup time of these fuel cells are problematic for automotive applications.
22.
However, at the moment hydrogen gas is produced by steam reforming light hydrocarbons, a process which produces a mixture of gases that also contains CO ( 1 3 % ), CO 2 ( 19 25 % ), and N 2 ( 25 % ).
