h2 production conference presentation

8/6/2019 h2 Production Conference Presentation

1/18

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

CCChhheeemmmiiicccaaalllPPPrrroooccceeessssss EEEnnngggiiinnneeeeeerrriiinnnggg RRReeessseeeaaarrrccchhh IIInnnssstttiiitttuuuttteee

CCCeeennntttrrreee fffooorrrRRReeessseeeaaarrrccchhh aaannndddTTTeeeccchhhnnnooolllooogggyyyHHHeeellllllaaasss

AAArrriiissstttoootttllleee UUUnnniiivvveeerrrsssiiitttyyyooofffTTThhheeessssssaaalllooonnniiikkkiii

DDDeeepppaaarrrtttmmm eeennntttooofffCCChhheeemmmiiicccaaalllEEEnnngggiiinnneeeeeerrriiinnnggg

International Conference on HInternational Conference on H22 Production 2011Production 2011

V. Kyriakou

, C. Athanasiou, I. Garagounis, A. Skodra and M. Stoukides


2/18

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


3/18

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


4/18

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


5/18

Operation modes: a) Open circuit , b) Fuel cell mode, c) Proton pumping mode

Proton Conducting Cell


6/18

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


7/18

2 CH4 2 H2 + C2H4

CH4

C + 2 H2

Methane Dimerization in a Proton

Conducting Membrane Reactor

Side reaction:

CellO

verall Reaction:


8/18

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


9/18

ExperimentalExperimental


10/18

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)


11/18

5Ce5Ce--5Na5Na22WOWO44/SiO/SiO22-Au (Open Circuit Studies)

Dominant product is CO2

H2 incr as it CH4

Elimination of H2 at ig O2


12/18

5Ce5Ce--5Na5Na22WOWO44/SiO/SiO22-Au (Closed Circuit Studies)

FS = Separated 2/ Produced 2

2 increase with current


13/18

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


14/18

La0.6Sr0.4Co0.8Fe0.2O3 (Open Circuit Studies)

Comparable C2 - CO2

Hig er formatio rate of H2


15/18

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


16/18

La0.6Sr0.4Co0.8Fe0.2O3(Cogeneration Preliminary Studies)

Positive affection of current

Lo o er ensities


17/18

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


18/18

Thank you for your attentionThank you for your attention

h2 production conference presentation

Documents