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Structure Sensitivity of La2O2CO3 Catalysts in the Oxidative Coupling of Methane
Abstract
Methane is the main component of natural gas and shale gas. It is chemically stable, and its activation often requires high temperatures, which lead to its extensive transformation into undesirable products such as CO and CO 2 . Thus, the development of efficient catalysts for the selective transformation of methane represents a substantial challenge. In this work, we synthesized La 2 O 2 CO 3 samples with different morphologies (rod- and plate-shapes) at the nanometer scale. We observed that one of the rod-shaped samples exhibited the best catalytic properties among the investigated samples in the oxidative coupling of methane (OCM) at low temperatures (420–500 °C); in addition, its specific activity was 20 times greater than that of any of the other rod-shaped samples. This difference corresponded to the O 2 -TPD results and was attributed to the crystallographic facets exposed. Among the exposed facets, the (110), (12̅0), and (21̅0) facets had relatively loose atomic configurations that increased the conversion of methane in the OCM. Moreover, these facets were beneficial to the formation of the chemisorbed oxygen species and their moderately basic sites, which improve the selectivity in the OCM.
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Tian, N., Zhou, Z.-Y., Sun, S.-G., Ding, Y., & Wang, Z. L. (2007) · Science · doi:10.1126/science.1140484 · Cited by 3,073
Shape-Controlled Synthesis of Pd Nanocrystals and Their Catalytic Applications
Zhang, H., Jin, M., Xiong, Y., Lim, B., & Xia, Y. (2013) · Accounts of Chemical Research · doi:10.1021/ar300209w · Cited by 644
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Significant Advances in C1 Catalysis: Highly Efficient Catalysts and Catalytic Reactions
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Metadata
- Authors
- Hou, Y.-H., Han, W.-C., Xia, W.-S., & Wan, H.-L.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-02-12
- Volume
- 5
- Issue
- 3
- Pages
- 1663-1674
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2322620472
- Cited by
- 184
- References
- 2
- FWCI
- 3.24
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hou, Y.-H., Han, W.-C., Xia, W.-S., & Wan, H.-L. (2015). Structure Sensitivity of La2O2CO3 Catalysts in the Oxidative Coupling of Methane. ACS Catalysis. https://doi.org/10.1021/cs501733r
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