Abstract
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 oxygen 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 Cα on the catalyst in time during the reaction process to remove carbon deposition.
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