new concepts for optimized hydrogen storage in mofs · 2005-05-23 · new concepts for optimized...
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New Concepts for Optimized Hydrogen Storage in MOFs
Project ID #STP52 Yaghi
Omar M. Yaghi and Adam J. MatzgerDepartment of Chemistry
University of MichiganAnn Arbor, MI 48109
May 23, 2005This presentation does not contain any proprietary or confidential information
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Overview
• Project start date1/1/2005
• Project end date12/31/2008
• Percent complete2%
• Technical barriers addressed• B) Weight and Volume• C) Efficiency• M) Hydrogen Capacity and
Reversibility• Technical targets by YR 2010
• Gravimetric capacity: 6.0%• Volumetric capacity: 4.5%• Operating ambient temp.: -30/50 °C• Total project funding
• DOE share: $1.60M• Contractor share: $0.35M
• Funding received in FY04• $0.00
• Funding for FY05• $37,500 (estimated)
Timeline
Budget
Barriers
• Juergen Eckert (Los Alamos)• Randall Q. Snurr
(Northwestern University)• Joseph T. Hupp (Northwestern
University)
Partners (planned FY06)
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ObjectivesTo develop next generation, highly porous metal-organic framework materials (MOFs) that meet or
exceed DOE targets for on-board H2 storage.Improve mass and volumetric H2 density in MOFs.
Utilize strategies for design of materials with high thermal stability and architectural stability.Utilize new concepts for synthesis of materials with extraordinary surface areas (>2000 m2/g) Develop strategies for synthesis of MOFs having minimal open space but very high surface areas.
Employ MOFs in reversible H2 storage systems.Measure H2 uptakes under full range of temperatures and pressures as specified in the DOE freedomCAR guidelines.Down-select best materials for scale-up.
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Implement three major strategies that minimizes open space while increasing total surface area for H2 binding.
Increase surface areas by increasing exposed edges in framework comprising MOF.Use catenated networks.Impregnation of large pores to produce new internal sorption sites and higher surface area.
Equilibrium H2 uptake as a function of structure.Measure H2 uptakes under full range of conditions designated in DOE YR 2010 targets.Use Raman spectroscopy to elucidate H2 interaction with new materials.
Design and Approach
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MOFs as H2 Storage Materials
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Synthetic Strategy to High Surface Area MOFs
Exposing latent edges dramatically increases surface area.
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H2 Storage Capacity at RT & 10 bar
IRMOFIRMOF--6 (B)6 (B)
MOFMOF--5 (A)5 (A)Graphite carbonGraphite carbon
Active carbonActive carbon
Volumetric Apparatus [mg HVolumetric Apparatus [mg H22/g]/g]IRMOFIRMOF--8 (C)8 (C)
0 5 10 15 200
4
8
12
16
Gravimetric Apparatus [mg HGravimetric Apparatus [mg H22/g]/g]
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Structure of Zn4O(1,3,5-benzenetribenzoate)3
MOF-177: SA (Langmuir) = 4,500 m2/g, Vp = 1.59 cm3/g
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Low Pressure, Low Temperature H2 Sorption
IRMOF-1
IRMOF-8
MOF-1770
2
4
6
8
10
12
14
16
18
0 200 400 600 800
T = 77 K
Pressure (Pressure (TorrTorr))
Gra
vim
etric
Upt
ake
(mg/
g)G
ravi
met
ric U
ptak
e (m
g/g)
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Large Free Volume in Catenated Networks: The role of Secondary Building Units
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Types of Catenation
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Structure of Interwoven Cu3(1,3,5-benzenetribenzoate)2(H2O)3
MOF-14: SA (Langmuir) = 1,502 m2/g; Vp = 0.53 cm3/g
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Structure of Interpenetrated Tb2(4,4’-azodibenzoate)3[(CH3)2SO]3
MOF-9: VFree= 71% VCrystal; 16 [(CH3)2SO]/unit cell
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Interpenetrated IsoreticularMOFs
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02468
1012141618
0 200 400 600 800
IRMOF-1
IRMOF-8
MOF-177
IRMOF-11T = 77 K
Pressure (Pressure (TorrTorr))
Low Pressure, Low Temperature H2 Sorption
Gra
vim
etric
Upt
ake
(mg/
g)G
ravi
met
ric U
ptak
e (m
g/g)
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Reversible H2 sorption in IRMOF-11 at 77K
Time (min)Time (min)
Mas
s (%
)M
ass
(%)
IRMOF-11
0 20 40 60 80 100 120 140
102.0
101.5
101.0
100.5
100.0
99.5
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Impregnation of MOF-177
Astrazon orange Nile red Reichardt’s dye
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Inclusion of C60 in MOF-177
Raman SpectroscopyRaman SpectroscopyA) Bulk C60
B) Evacuated MOF-177C) Single crystal with C60
D) Single crystal with C60cleaved in half
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Future Work2005 2006 2007 2008TASKTASK
Task 1: High Surface Area MOFsSynthesize new polycyclic organic links Synthesize MOFs with minimal fused
edgesReduce pore dead volume by forming
catenated netsReduce open space in pores by
inclusion of guests with sites for H2binding
Task 2: Polarization EffectsFunctionalization of MOFs with group
of varying polarity Correlate H2 uptake to electron
donating/withdrawing ability of groups
Task 3: Modeling H2 Uptake (Northwestern)
Quantitate charge density of organic linker, compare to nanotubes
Screen promising candidates for inclusion
Quantitate H2 interaction in MOFsPredict H2 isotherms
Task 4: Characterization & Testing
Go/No-Go points
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Publications and PresentationsPlease list any publications and presentations that have resulted from work on this project.
No publications resulting from current funding.
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Hydrogen Safety
The most significant hydrogen hazard associated with this project is:
High exposure to H2 gas with possibility of personal injury due to decreased oxygen content in the atmosphere.
High concentrations of H2 may pose a fire or explosion in and around instrumentation.
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Hydrogen Safety
Our approach to deal with this hazard:
Dedicated a single laboratory for all H2 experiments.
Installed active ventilation snorkles from laboratory hoods to all instrumentation consuming/ releasing H2.
Installed atmospheric H2 detector (% level detection) outfitted with an alarm in the dedicated laboratory.