This isn't strictly a LENR-related discussion. You might have read that Rossi now apparently uses graphene in his QuarkX. Whether true or not, I somehow suspected that in an atmosphere of hot atomic hydrogen, which would be quite reactive, this would lead to the formation of various hydrocarbons (CH4, C2H2, etc), so I started researching the subject. According to some sources (not many so far) while this is definitely the case at low to medium temperatures (at least with graphite) it seems that above roughly 1000-1200°K hydrocarbon formation is strongly slowed or inhibited.
So my question is: does anybody have information or other sources contradicting what I seem to understand here?