Three-Dimensional Carbon Nanotube Scaffolds as Particulate Filters and Catalyst Support Membranes
Source abstract
Abstract
Three-dimensional carbon nanotube scaffolds created using micromachined Si/SiO2 templates are used as nanoparticulate filters and support membranes for gas-phase heterogeneous catalysis. The filtering efficiency of better than 99% is shown for the scaffolds in filtering submicrometer particles from air. In the hydrogenation of propene to propane reaction low activation energy of E(a) approximately 27.8 +/- 0.6 kJ x mol(-1), a considerably high turnover rate of approximately 1.1 molecules x Pd site(-1) x s(-1) and durable activity for the reaction are observed with Pd decorated membranes. It is demonstrated that appropriate engineering of macroscopic-ordered nanotube architectures can lead to multifunctional applications.
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Research context
OpenAlex topics: Carbon Nanotubes in Composites · Catalytic Processes in Materials Science · Graphene research and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Microelectronics and Materials Physics Laboratories, and EMPART Research Group of Infotech Oulu, Department of Electrical and Information Engineering, University of Oulu; P.O. Box 4500, FIN-90014 University of Oulu, Finland
Mass and Heat Transfer Process Laboratory, Department of Process and Environmental Engineering, University of Oulu, P.O. Box 4300, FIN-90014 University of Oulu, Finland
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary
Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005
References (26)
Show source-provided references
1. Gellman A. J. · Nat. Mater. · 2009 · 8 · 8710.1038/nmat2363 ↗
2. Ahn Y. C. · Curr. Appl. Phys. · 2006 · 6 · 103010.1016/j.cap.2005.07.013 ↗
3. Sazonova V. · Nature · 2004 · 431 · 28410.1038/nature02905 ↗
4. Toth G. · Adv. Mater. · 2009 · 21 · 205410.1002/adma.200802200 ↗
5. Cao A. Y. · Nat. Mater. · 2005 · 4 · 54010.1038/nmat1415 ↗
6. Kordas K. · Appl. Phys. Lett. · 2007 · 90 · 12310510.1063/1.2714281 ↗
7. Halonen N. · J. Phys. Chem. C · 2008 · 112 · 672310.1021/jp7110617 ↗
8. First, from the diameter of nanoparticles we calculate the corresponding volumes and surface areas assuming a spherical shape, then take their mean to get ⟨V⟩ and ⟨A⟩. The average number of Pd atoms in the bulk ⟨N⟩Vpdand on the surface ⟨N⟩Apdare obtained as ⟨N⟩Vpd= ⟨V⟩(6.96 × 1022atom/cm3) and ⟨N⟩Apd= ⟨A⟩(1.37 × 1015atom/cm2), respectively, where 0.386 nm is the unit cell parameter of fcc Pd. The dispersion of the catalyst is defined as ⟨N⟩Apd/⟨N⟩Vpd. The turnover rate (TOR) defined as the rate of generated molecules over the number of catalyst surface atoms is estimated asTOR=1L/min×105Pa×2000ppm×0.62300K×8.314J/mol·K(0.79mg×0.11106.4g/mol)−1≈1.1s−1.
9. Satterfield, C. N.Heterogenous Catalysis in Practice;McGraw-Hill:New York, 1980; pp318−328.
10. Biloé S. · Carbon · 2003 · 41 · 52510.1016/S0008-6223(02)00363-9 ↗
11. Cooper S. M. · Nano Lett. · 2003 · 3 · 18910.1021/nl0259131 ↗
12. Celzard A. · Progress Mater. Sci. · 2005 · 50 · 9310.1016/j.pmatsci.2004.01.001 ↗
13. Gallagher P. K. · J. Therm. Anal. · 1986 · 31 · 123110.1007/BF01914636 ↗
14. Lin R. · Catal. Lett. · 2004 · 93 · 13910.1023/B:CATL.0000017067.19873.32 ↗
15. McCarty J. G. · Catal. Today · 1995 · 26 · 28310.1016/0920-5861(95)00150-7 ↗
16. Kordás K. · Nanotechnology · 2006 · 17 · 145910.1088/0957-4484/17/5/049 ↗
17. Cocco G. · J. Mol. Catal. · 1994 · 94 · 29910.1016/0304-5102(94)00130-8 ↗
18. Yoo J. W. · J. Catal. · 2003 · 214 · 110.1016/S0021-9517(02)00136-7 ↗
19. Molero H. · Catal. Lett. · 2005 · 101 · 14510.1007/s10562-005-4881-7 ↗
20. Yuranov I. · J. Mol. Catal. A · 2003 · 192 · 23910.1016/S1381-1169(02)00441-7 ↗
21. Ng Y. H. · Langmuir · 2008 · 24 · 630710.1021/la800045u ↗
22. Smajda R. · Carbon · 2007 · 45 · 117610.1016/j.carbon.2007.02.022 ↗
23. Serp P. · Appl. Catal., A · 2003 · 253 · 33710.1016/S0926-860X(03)00549-0 ↗
24. Yu R. Q. · Chem. Mater. · 1998 · 10 · 71810.1021/cm970364z ↗
25. Solhy A. · Carbon · 2008 · 46 · 119410.1016/j.carbon.2008.04.018 ↗
26. Tavasoli A. · Appl. Catal., A · 2008 · 345 · 13410.1016/j.apcata.2008.04.030 ↗