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Issue 29, 2018
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Probing the enhanced catalytic activity of carbon nanotube supported Ni-LaOx hybrids for the CO2 reduction reaction

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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).

Graphical abstract: Probing the enhanced catalytic activity of carbon nanotube supported Ni-LaOx hybrids for the CO2 reduction reaction

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Publication details

The article was received on 14 May 2018, accepted on 17 Jun 2018 and first published on 19 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR03882A
Citation: Nanoscale, 2018,10, 14207-14219
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    Probing the enhanced catalytic activity of carbon nanotube supported Ni-LaOx hybrids for the CO2 reduction reaction

    J. Gao, Q. Jiang, Y. Liu, W. Liu, W. Chu and D. S. Su, Nanoscale, 2018, 10, 14207
    DOI: 10.1039/C8NR03882A

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