Formation of H2O in the CH4-CO2 dry reforming process and its activation to this reaction over Ni-Fe/MC12A7 catalysts

Dry reforming reaction of greenhouse gas CH 4 and CO 2 was studied over Ni-Fe bimetallic catalyst, in which the composite support of C12A7-O 2- in MCM-41 was used. The isotope 13 CH 4 /D 2 O tracing experiment showed CO mainly comes from 13 CHx oxidation reaction and DH comes from CHx and D 2 O reaction, exhibiting lattice oxygen promotes CH X oxidation and water accelerate methane conversion. XPS and TPSR-MS studies exhibited the existence of lattice oxygen in catalysts produces a little H 2 O to facilitate a lower starting point at the reaction temperature. On-line MS investigation found that the trace water addition in the system accelerated the adsorption of CO 2 on support and promoted methane dissociation, the H 2 signal appears later than CO, indicating the oxidation reaction of CHx occurs after the dissociation of CO 2 . Besides, TG analysis tells us the H 2 O may consume Cα on the catalyst in time during the reaction process to remove carbon deposition.