three-dimensional composite nanostructures for lean nox ... · g. pilania and r. ramprasad, surface...
TRANSCRIPT
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Three-Dimensional Composite Nanostructures for Lean NOx Emission Control
PI: Pu-Xian Gao
Department of Chemical, Materials and Biomolecular Engineering & Institute of Materials Science
University of Connecticut, Storrs, CT
05/12/2011
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Project ID #ACE030
This presentation does not contain any proprietary, confidential, or otherwise restricted information
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Project Overview
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• Project start date: 10/01/2009• Project end date: 09/31/2012• Percent complete: continuing
• Barriers addressed– Lean NOx emission reduction– Particulate filtering using new
catalysts– New catalysts for
reducing/eliminating usage of noble metals
– Simplification of emission control devices to reduce the cost
• Total project funding– DOE share: $1,248,242– Contractor share: $314,504
• Funding received in FY10-11 from DOE: $809,446
Timeline
Budget
Barriers
• Honda Research Institute (OH)Partners
Project Objective–To develop a unique class of 3D metal oxide (MeOx)/perovskite (ABO3) composite
nanostructure catalysts to reduce and control lean NOx emission in vehicles, eventually to replace or reduce the usage of the Pt-group metal catalysts.
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Objectives and Approaches
Synthesis: To synthesize 3D composite nano(wire/dendrite)arrays rooted on different substrates by
solution and vapor phase approaches. Characterization:
To investigate the structure, morphology, chemical and electronic properties of composite nanorrays using a range of microscopy and spectroscopy techniques. Activity, Selectivity, Durability and Regenerability:
To explore the catalytic behavior and stability using microscopy, spectroscopy, thermal analysis and temperature programmed surface analysis tools. Surface Catalysis Modeling :
To simulate and model the surface catalysis behavior on composite nanocatalyst surfaces and interfaces using DFT atomistic calculation.
• Objectives (quarters 3-6, 04/1/2010-3/31/2011) – Synthesis and characterization of 3D nanoarray catalysts.– Metal loading and thermal stability testing– Modeling of surface NOx catalytic chemistry in 3D nanocomposite surface and interface.
• Approaches:
1) Ultrahigh surface; 2) High thermal stability; 3) Strong adherence;4) Low cost; 5) High tailoring ability
MeOx
ABO3
Substrate support
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Accomplishments(Project period: 04/1/2010-03/1/2011)
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1) Successful synthesized and characterized various metal oxidenanoarrays on various planar and monolith substrates.
2) Successful fabricated, characterized, and identified various 3Dcomposite nanowires with very high specific surface area.
3) Successfully characterized and initially validated the thermalstability of various composite nanowires on monolith substratesunder oxidative and reductive atmospheres.
4) Successfully initiated the emission testing over NOx storage andreduction.
5) Successfully modeled and found the high activity of severalperovskite crystal surfaces for O involved reactions.
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Metal oxide nanowire arrays on solid substrates.
Large scale nanoarrays by solution and vapor phase depositions
5W. Cai, P. Shimpi, D. Jian, P.-X. Gao, J. Mater. Chem. 2010; G. Liu, Y. Guo, P.-X. Gao et al., 2011, submitted;Y. Guo, Z. Zhang, P.-X. Gao et al., 2011, submitted.
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Metal oxide nanowire arrays on solid substrates.
Large scale nanoarrays by solution and vapor phase depositions
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10 µm2 µm
W. Cai, P. Shimpi, D. Jian, P.-X. Gao, J. Mater. Chem. 2010; G. Liu, Y. Guo, P.-X. Gao et al., 2011, submitted;Y. Guo, Z. Zhang, P.-X. Gao et al., 2011, submitted.
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Metal oxide nanowire arrays on solid substrates.
Large scale nanoarrays by solution and vapor phase depositions
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10 µm2 µm
W. Cai, P. Shimpi, D. Jian, P.-X. Gao, J. Mater. Chem. 2010; G. Liu, Y. Guo, P.-X. Gao et al., 2011, submitted;Y. Guo, Z. Zhang, P.-X. Gao et al., 2011, submitted.
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MeOx/ABO3 composite nanoarrays
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Composite nanowire arrays on solid substrates. W. Cai, P. Shimpi, et al., 2011, submitted; P. Shimpi, C. Chung, et al., 2011, to be submitted; H. Gao, et al., APL, 2011.
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MeOx/ABO3 composite nanoarrays
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Composite nanowire arrays on solid substrates. W. Cai, P. Shimpi, et al., 2011, submitted; P. Shimpi, C. Chung, et al., 2011, to be submitted; H. Gao, et al., APL, 2011.
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Thermal stability of ZnO/LSCO nanoarrays
W. Cai, P. Shimpi, et al., 2011, submitted.
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Thermal stability of ZnO/LSCO nanoarrays
W. Cai, P. Shimpi, et al., 2011, submitted.
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Thermal stability of ZnO/LSCO nanoarrays
W. Cai, P. Shimpi, et al., 2011, submitted.
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Thermal stability of ZnO/LSCO nanoarrays
600oC490m2/g
800oC268m2/g
1000oC262m2/g
25oC424m2/g
W. Cai, P. Shimpi, et al., 2011, submitted.
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Metal loading on metal oxide nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
2 µm
100 nm
ZnO/LSMO/Pd nanoarrays
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Metal loading on metal oxide nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
2 µm
100 nm
KeV
20 nm
Pd nanoparticles
ZnO/LSMO/Pd nanoarrays
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Metal loading on metal oxide nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
2 µm
100 nm
KeV
20 nm
Pd nanoparticles
ZnO/LSMO/Pd nanoarrays
Wt. %4.21Impregnation
Nanoparticle dispersion Wt. %1.91
KeV
TiO2/Pt nanoarrays
2 nm
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Structure and surface areas of TiO2nanoarrays on substrate
Samples TiO2-Cordierite TiO2
800oC TiO2-Cordierite 800oC TiO2
Specific Surface Area (m2/g) 37.96 704.47 24.51 454.86
Y. Guo, Z. Zhang, et al., 2011, submitted.
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Thermal stability of TiO2nanorods array at 800oC for 24h
Thermal stability of TiO2 nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
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Thermal stability of TiO2nanorods array at 800oC for 24h
Thermal stability of TiO2 nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
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Thermal stability of TiO2nanorods array at 800oC for 24h
200 400 600 800 1000 1200 1400 160090
92
94
96
98
100
TiO2 nanorods array
Wei
ght(%
)
Time(min)
Thermal stability of TiO2 nanoarrays
Y. Guo, Z. Zhang, et al., 2011, submitted.
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Thermal stability of TiO2 nanoarraysunder oxidative atmosphere
TGA and DSC of TiO2 nanorods array on substrates
0 200 400 600 800 100095
96
97
98
99
100
Blank CHS TiO2/Pt nanorods array/CHS TiO2 nanorods array/CHS
Wei
ght(%
)
Temperature(oC)
0 200 400 600 800 1000
-100
-90
-80
-70
-60
-50
-40
-30
-20
Blank CHS TiO2/Pt nanorods array /CHSTiO2 nanorods array/CHS
Hea
t Flo
w(m
W)
Temperature(oC)
Y. Guo, Z. Zhang, et al., 2011, submitted.
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TPR-H2 of Pt coated TiO2 nanoarrays on substrates.
Thermal stability of TiO2 nanoarraysunder reductive atmosphere
Y. Guo, Z. Zhang, et al., 2011, submitted.
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O ad-atoms on perovskites:Geometry, electronic structure and energetics
Perovskite crystal structure Various O adsorption sites on the (001) surfaces
1x1 AO-terminated 1x1 BO2-terminated
PbTiO3v/s
LaMnO3
G. Pilania and R. Ramprasad, Surface Sci. 2010.23
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(p,T) surface phase diagrams:Thermodynamic stability of Clean and Oad atom
or vacancy covered surfaces
Based on DFT calculations within LDA approximation24
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Computed reaction barriers
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Collaborations Partners:
• Honda Research Institute (industry): collaboration on catalyst design and synthesis, emission control catalytic behavior testing;
• United Technologies (industry): collaboration on nanomaterials synthesis and surface analysis
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Future work
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1) Conduct systematical synthesis optimization of 3Dcomposite nanowire arrays.
2) Continue the metal (oxide) loading/doping study on 3Dcomposite nanowire arrays.
3) Evaluate the catalytic performance of 3D compositenanowire arrays on the NOx storage and reductionperformance.
4) Calculate reaction barriers for various elementary stepsinvolved in the oxygen dynamics on the perovskite crystalsurfaces associated with incorporation of NOx interactions.
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Acknowledgements• Postdoc: Drs. Y. Guo, Z. Zhang, H. Gao, and G. Liu
Graduate students: W. Cai, P. Shimpi, G. Pilania, C. Chung, S. Glod, Z. Ren
• Co-PIs: Drs. P. Alpay and R. Ramprasad (UConn), Dr. C. Brooks (HRI, Ohio)
• Project officers: K. Howden, M. Ursic• DOE/NETL, UConn Research Foundation, UConn - New
faculty start-up funds, ACS-PRF, Honda Research Institute
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