 Most methods work by exposing methane to a catalyst (usually nickel) at high temperature and pressure.Steam reforming (SR), sometimes referred to as steam methane reforming (SMR) uses an external source of hot gas to heat tubes in which a catalytic reaction takes place that converts steam and lighter hydrocarbons such as methane, biogas or refinery feedstock into hydrogen and carbon monoxide (syngas).Syngas reacts further to give more hydrogen and carbon dioxide in the reactor.