P2-877Zero-CO2-emission Hydrogen from CH4:Equilibrium analysis for reactor designKey Words:Dry Reforming of Methane, Water Gas Reaction, Reverse Water Gas Reaction Dry Reforming of Methane (DRM) is a reaction that convert two green gasses; methane (CH4) and carbon dioxide (CO2) into hydrogen (H2) and carbon monoxide (CO). H2can beextracted and used as energy source while CO can be turned back into CO2and solid carbon (C) using Boudardreaction. The CO2can be recycled back into the system while solid C can be used as material for other purposes.⚫WGR and RWG are faster than DRM reactor for commercial Ru based catalyst.⚫Unextracted H2that reenters the DRM reactor will consume CO2, negatively affecting the mass balance.⚫Unextracted CO that reenters the DRM reactor is beneficial for DRM reactor and limit the RWG reaction.ConclusionMethodologyEffect of recycled, unextracted H2⚫Investigate kinetic of other catalyst that has better selectivity towards DRM⚫Extract H2 from the combination of DRM and Boudard reactorFuture PlanIntroductionWater Gas Reaction (WGR) and Reverse Water Gas Reaction (RWG) are two side reactions that occur simultaneously in DRM reactor that reduces the efficiency of DRM reactor to function as hydrogen generator. We investigated the kinetic of DRM, WGR and RWG reactions and successfully modelled the reaction to predict the behavior. This enables us to build a working, predictable and controllable DRM reactor.Theme underDiscussionHydrogen Production Catalyst Material Group, GREEN HAZRUL ADZFAR BIN SHABRIE-mail：： SHABRI.hazruladzfarbin@nims.go.jpDRM reactor equilibriaEffect of recycled, unreacted CO•Reaction occurring in DRM reactor;.•Unreacted CO that reenter the DRM reactor will be involved in faster WGR reaction and shift the equilibrium backward for RWG. This limits the conversion of H2to H2O. •CO was not found to affect DRM equilibrium.•To ensure high CH4conversion at DRM reactor, CO gas can act as medium gas together with recycled CO2.•Unextracted H2that reenter the DRM reactor will be involved in faster RWG reaction and compete with DRM reaction and consume CO2reactant faster than DRM. •To ensure high CH4conversion at DRM reactor, CO2need to be added at equimolar ratio of recycled H2.•Unextracted H2 will be 90% converted to H2O, wasting precious H2gas and disrupt mass balance.•In an ideal DRM reactor, equimolar input of CH4and CO2 can be used to ensure high conversion of CH4•In non-ideal condition, due to RWG and WGR reaction, CH4to CO2ratio need to be set at higher than 1:1.2 ratio to ensure high conversion of CH4.•Due to RWG reaction as well, CH4to CO2ratio need to be set lower than 1:1.5 ratio to ensure high production of H2.DRMCH4+CO2→2H2+2CORWG H2+CO2→H2O + COWGR H2O + CO →H2+CO2CH4+CO2→2H2+2CO2CO→CO2+ CCH4CO2H2COH2CO2CH2•Kinetic experiment was performed on Ruthenium based catalyst to investigate the kinetic of DRM, WGR and RWG.•Kinetic parameter were estimated using numerical optimization. •Similarlythe dynamic of the DRM reactor and hence the equilibrium of DRM, RWG and WGR were investigated using numerical method.DRM REACTOR•Rate equation used.•Rate of changes of chemical species.
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