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Gao J, Jiang Q, Liu Y, Liu W, Chu W, Su DS. Probing the enhanced catalytic activity of carbon nanotube supported Ni-LaO x hybrids for the CO 2 reduction reaction. NANOSCALE 2018; 10:14207-14219. [PMID: 30009309 DOI: 10.1039/c8nr03882a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Oxygenated functionalized carbon nanotube (oCNT) supported LaOx-promoted Ni nanoparticles (10Ni-xLa/oCNT) were prepared by the co-impregnation method and tested for synthetic natural gas from the CO2 reduction reaction. Several advanced characterization methods, including atomic resolution scanning transmission electron microscopy (STEM), temperature programmed experiments (TPSR, CO2-TPD, and H2-TPR) and X-ray photoelectron spectroscopy (XPS), were applied to explore, for the first time, the origin of structure modulation of LaOx species on oCNT supported Ni-LaOx hybrids and the structure-activity relationship over the CO2 reduction reaction. The Z-contrast STEM-HAADF results revealed that the LaOx species are mostly in the size of the sub-nano scale and highly dispersed on the surface of Ni nanoparticles and oCNT, and consequently no diffraction peak of LaOx was observed from XRD results. TEM analysis showed that the Ni nanoparticle sizes were similar among all samples either after reduction or after reaction due to the relatively strong interaction between Ni and oxygenated groups on CNT supports, regardless of the influence of the La mass loading. It was suggested that the catalytic performance trend was due to the structural variation rather than the size effect. The LaOx modulation catalyst with 2 wt% of La metal loading not only presented low CO2 activation temperature at only 163 °C, but also resulted in extremely high CH4 selectivity (100%) compared with the initial supported Ni catalyst (52.7% of CH4 selectivity at 300 °C).
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Affiliation(s)
- Jie Gao
- College of Chemical Engineering, Sichuan University, 610065 Chengdu, China. and Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China.
| | - Qian Jiang
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China.
| | - Yuefeng Liu
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China.
| | - Wei Liu
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China.
| | - Wei Chu
- College of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
| | - Dang Sheng Su
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China.
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Zhao ZW, Zhou X, Liu YN, Shen CC, Yuan CZ, Jiang YF, Zhao SJ, Ma LB, Cheang TY, Xu AW. Ultrasmall Ni nanoparticles embedded in Zr-based MOFs provide high selectivity for CO2 hydrogenation to methane at low temperatures. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00468d] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Highly monodisperse Ni NPs in UiO-66 give both excellent activity and selectivity for CO2 methanation at low temperatures.
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