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A Facile Method for Preparing UiO-66 Encapsulated Ru Catalyst and its Application in Plasma-Assisted CO2 Methanation

College of Physical Science and Technology, Dalian University, Dalian 116622, China
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Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1432; https://doi.org/10.3390/nano9101432
Received: 12 September 2019 / Revised: 29 September 2019 / Accepted: 4 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Novel Nanomaterials for Applications in Energy and Catalysis)
With increasing applications of metal-organic frameworks (MOFs) in the field of gas separation and catalysis, the preparation and performance research of encapsulating metal nanoparticles (NPs) into MOFs ([email protected]) have attracted extensive attention recently. Herein, an [email protected] catalyst is prepared by a one-step method. Ru NPs are encapsulated in situ in the UiO-66 skeleton structure during the synthesis of UiO-66 metal-organic framework via a solvothermal method, and its catalytic activity for CO2 methanation with the synergy of cold plasma is studied. The crystallinity and structural integrity of UiO-66 is maintained after encapsulating Ru NPs according to the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). As illustrated by X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), and mapping analysis, the Ru species of the hydration ruthenium trichloride precursor are reduced to metallic Ru NPs without additional reducing processes during the synthesis of [email protected], and the Ru NPs are uniformly distributed inside the [email protected] Thermogravimetric analysis (TGA) and N2 sorption analysis show that the specific surface area and thermal stability of [email protected] decrease slightly compared with that of UiO-66 and was ascribed to the encapsulation of Ru NPs in the UiO-66 skeleton. The results of plasma-assisted catalytic CO2 methanation indicate that [email protected] exhibits excellent catalytic activity. CO2 conversion and CH4 selectivity over [email protected] reached 72.2% and 95.4% under 13.0 W of discharge power and a 30 mL·min−1 gas flow rate ( V H 2 : V C O 2 = 4 : 1 ), respectively. Both values are significantly higher than pure UiO-66 with plasma and Ru/Al2O3 with plasma. The enhanced performance of [email protected] is attributed to its unique framework structure and excellent dispersion of Ru NPs. View Full-Text
Keywords: metal-organic frameworks; Ru NPs; encapsulation; CO2 methanation; plasma metal-organic frameworks; Ru NPs; encapsulation; CO2 methanation; plasma
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Xu, W.; Dong, M.; Di, L.; Zhang, X. A Facile Method for Preparing UiO-66 Encapsulated Ru Catalyst and its Application in Plasma-Assisted CO2 Methanation. Nanomaterials 2019, 9, 1432.

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