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Manganese Oxide Mesoporous Structures: Mixed-Valent Semiconducting Catalysts
Abstract
Hexagonal and cubic phases of manganese oxide mesoporous structures (MOMS) have been prepared by means of the oxidation of Mn(OH) 2 . The hexagonal MOMS materials form a hexagonal array of pores with an open porous structure, thick walls (1.7 nanometers), and exceptional thermal stability (1000°C). The walls of the mesopores are composed of microcrystallites of dense phases of Mn 2 O 3 and Mn 3 O 4 , with MnO 6 octahedra as the primary building blocks. The calcined hexagonal MOMS have an electrical conductivity of 8.13 × 10 −6 per ohm·centimeter, an average manganese oxidation state of 3.55, and a band gap of 2.46 electron volts. Catalytic oxidations of cyclohexane and n -hexane in aqueous solutions in a batch reactor show conversions of ∼10 and ∼8 percent, respectively. Characterization and catalytic data suggest that MOMS systems show significant enhancement in thermal stability with respect to octahedral molecular sieve materials.
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Cited by
Generalized syntheses of large-pore mesoporous metal oxides with semicrystalline frameworks
Yang, P., Zhao, D., Margolese, D. I., Chmelka, B. F., & Stucky, G. D. (1998) · Nature · doi:10.1038/24132 · Cited by 2,493
On the controllable soft-templating approach to mesoporous silicates
Wan, Y., & Zhao (2007) · Chemical Reviews · doi:10.1021/cr068020s · Cited by 2,371
Yantasee, W., Warner, C. L., Sangvanich, T., Addleman, R. S., Carter, T. G., Wiacek, R. J., Fryxell, G. E., Timchalk, C., & Warner, M. G. (2007) · Environmental Science & Technology · doi:10.1021/es0705238 · Cited by 688
On the Synergetic Catalytic Effect in Heterogeneous Nanocomposite Catalysts
Shi, J. (2013) · Chemical Reviews · doi:10.1021/cr3002752 · Cited by 652
Kate, R. S., Khalate, S. A., & Deokate, R. J. (2018) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2017.10.262 · Cited by 574
Metadata
- Authors
- Tian, Z.-R., Tong, W., Wang, J.-Y., Duan, N.-G., Krishnan, V. V., & Suib, S. L.
- Venue
- Science
- Published
- 1997-05-09
- Volume
- 276
- Issue
- 5314
- Pages
- 926-930
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2077462294
- Cited by
- 667
- References
- 0
- FWCI
- 24.18
- Type
- journal article
- Language
- en
- Open access
- closed
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- Tian, Z.-R., Tong, W., Wang, J.-Y., Duan, N.-G., Krishnan, V. V., & Suib, S. L. (1997). Manganese Oxide Mesoporous Structures: Mixed-Valent Semiconducting Catalysts. Science. https://doi.org/10.1126/science.276.5314.926
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