the externally supplied natural gas was mixed with steam and then put into the reforming reactor at 800°C and 1.3 MPa. The products of the steam reforming reaction were cooled to 350°C and then entered into the water–gas conversion reactor, where carbon monoxide (CO) and H2O were converted into carbon dioxide (CO2) and hydrogen. Then the hydrogen was separated by pressure swing adsorption (PSA) When utilizing this data set for life cycle assessment (LCA), users must account for the upstream environmental impacts associated with natural gas extraction and processing. Also, the inclusion of by-product allocation for CO2 produced in the process should be considered. If the hydrogen is used as a feedstock, the consequential environmental impacts of its downstream applications must also be included in the LCA.