{HEAD ~ A process} 8 wherein the hydrogen diffusion membrane and the methanation catalyst of {TAIL ~ the gas separation device} function within similar temperature ranges 
{ HEAD ~ A process } 8 wherein the hydrogen diffusion membrane and the methanation catalyst of { TAIL ~ the gas separation device } function within similar temperature ranges
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH