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Oxygen Vacancy Promoting Dimethyl Carbonate Synthesis from CO2 and Methanol over Zr-Doped CeO2 Nanorods
Abstract
The synthesis of dimethyl carbonate (DMC) from CO 2 and methanol by Zr-doped CeO 2 nanorods with different ratios of Zr/Ce has been studied at 6.8 MPa and 140 °C. The catalysts were characterized extensively by TEM, XRD, N 2 adsorption, Raman spectroscopy, UV–vis spectroscopy, XPS, CO 2 -TPD, and in situ FTIR techniques. Doping of Zr atoms into the ceria lattice produced a fluorite-like solid solution, promoting the formation of oxygen vacancy sites. Zr-doped CeO 2 nanorods exhibited significantly more oxygen vacancy sites than pure CeO 2 nanorods. Zr 0.1 Ce nanorods which exhibited DMC synthesis activity also possess the highest concentration of oxygen vacancy sites. In situ FTIR studies further revealed that CO 2 can adsorb on the oxygen vacancy to form bidentate carbonate and as intermediate to participate in the reaction. This study presents a strategy to design a high-efficiency CeO 2 -based catalysts by controlling the concentration of the surface oxygen vacancies.
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Metadata
- Authors
- Liu, B., Li, C., Zhang, G., Yao, X., Chuang, S. S. C., & Li, Z.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-10-01
- Volume
- 8
- Issue
- 11
- Pages
- 10446-10456
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2895354615
- Cited by
- 668
- References
- 43
- FWCI
- 11.30
- Type
- journal article
- Language
- en
- Open access
- closed
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