h2 production conference presentation
TRANSCRIPT
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Production of HProduction of H22 and Cand C22 Hydrocarbons from MethaneHydrocarbons from Methane
in a Proton Conducting Solid Electrolyte Cellin a Proton Conducting Solid Electrolyte Cell
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International Conference on HInternational Conference on H22 Production 2011Production 2011
V. Kyriakou
, C. Athanasiou, I. Garagounis, A. Skodra and M. Stoukides
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OutliOutli
Goal and approach of this researchGoal and approach of this research
Solid state membrane reactorsSolid state membrane reactors
DimerizationDimerization of methaneof methane
Experimental ResultsExperimental Results
ConclusionsConclusions
Future workFuture work
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The development of a novel approach of upgrading
methane towards either:
simultaneous production/separation
of H2 and C2 hydrocarbons
cogeneration of electrical power and C2
hydrocarbons
The Goal of this ResearchThe Goal of this Research
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The reaction was studied in solid state
proton (H+) conducting cells, which would
operate either as:
H+ pumps
chemical cogenerative fuel cells
The ApproachThe Approach
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Operation modes: a) Open circuit , b) Fuel cell mode, c) Proton pumping mode
Proton Conducting Cell
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Conversion of methane to versatile industrialraw materials, such as ethane or ethylene:
2 CH4 + 1/2 2 C2H6 + H2O
2 CH4 + 2 C2H4 + 2 H2O
CH4 + 22 CO2 + 2 H2O
Selectivity to C2's decreases with increasing conversion and thus,the C2 yield is usually limited
To achieve industrially acceptable C2 yields, numerous catalysts
and reactor designs have been tested including solid electrolyte
membrane reactors
Oxidative Coupling of Methane
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2 CH4 2 H2 + C2H4
CH4
C + 2 H2
Methane Dimerization in a Proton
Conducting Membrane Reactor
Side reaction:
CellO
verall Reaction:
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Overall: 2 H2O + 3 CH
46 H
2+ C
2H
4+ CO
2Overall: 3 O
2+ 3 CH
44 H
2O+ C
2H
4+ CO
2
Fuel Cell modeProton Pumping mode
Cell Operation
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ExperimentalExperimental
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Reactor head
Working Electrode-
Catalyst
Counter
Electrode
SZY proton conductor
Double Chamber Cell Reactor
Glass
Sealant
YSZ tube
Quartz tube
Cooling
Water
Reactants Products
N2 or Air (FC)N2 , H2 or
Air, H2O (FC)
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5Ce5Ce--5Na5Na22WOWO44/SiO/SiO22-Au (Open Circuit Studies)
Dominant product is CO2
H2 incr as it CH4
Elimination of H2 at ig O2
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5Ce5Ce--5Na5Na22WOWO44/SiO/SiO22-Au (Closed Circuit Studies)
FS = Separated 2/ Produced 2
2 increase with current
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5Ce5Ce--5Na5Na22WOWO44/SiO/SiO22-Au (Summary)
Significant C2 rate improvement with O2 addition
Dominant product was CO2 in all cases
drastic increase of 2 Current application
constant C2 rates
Non-conductive catalyst
PEROVSKITES
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La0.6Sr0.4Co0.8Fe0.2O3 (Open Circuit Studies)
Comparable C2 - CO2
Hig er formatio rate of H2
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La0.6Sr0.4Co0.8Fe0.2O3 (Closed Circuit Studies)
Al st c l t s arati f H
C s a d H i cr as with curr t
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La0.6Sr0.4Co0.8Fe0.2O3(Cogeneration Preliminary Studies)
Positive affection of current
Lo o er ensities
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Conclusions
LSCF is better from good but not conductive C2 catalysts
Very good 2 separation with LSCF perovskite
Cogeneration also improved the C2 production rates
More perovskites to be tested
igher concentration of steam
Thinner electrolytes
Future Work
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Thank you for your attentionThank you for your attention