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 CH4 and CO2 was studied over Ni-Fe bimetallic catalyst, in which the composite support of C12A7-O2-in MCM-41 was used. The isotope 13CH4/D2O tracing experiment showed CO mainly comes from 13CHx oxidation reaction and DH comes from CHx and D2O reaction, exhibiting lattice ox-ygen promotes CHX oxidation and water accelerate methane conversion. XPS and TPSR-MS studies exhibited the existence of lattice oxygen in catalysts produces a little H2O 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 CO2 on support and promoted methane dissociation, the H2 signal appears later than CO, indicating the oxidation reaction of CHx occurs after the dissociation of CO2. Besides, TG analysis tells us the H2O may consume C & alpha; on the catalyst in time during the reaction process to remove carbon deposition.

Automated summary

Dry reforming reaction of CH4 and CO2 over Ni-Fe bimetallic catalyst using C12A7-O2-in MCM-41 composite support was studied. Isotope tracing experiment revealed that CO mainly comes from 13CHx oxidation reaction and DH comes from CHx and D2O reaction, indicating the promotion of CHx oxidation by lattice oxygen and acceleration of methane conversion by water. XPS and TPSR-MS studies confirmed the presence of lattice oxygen in catalysts, which produced a small amount of H2O to facilitate a lower starting point. On-line MS investigation showed that trace water addition accelerated the adsorption of CO2 and promoted methane dissociation, with the oxidation reaction of CHx occurring after the dissociation of CO2. Additionally, TG analysis suggested that H2O could consume Cα on the catalyst during the reaction process to remove carbon deposition.