期刊
JOURNAL OF CO2 UTILIZATION
卷 31, 期 -, 页码 167-172出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.03.011
关键词
Carbon dioxide methanation; Palladium; UiO-66; Metal-Organic frameworks; Synergistic effect
资金
- Key Project of National Natural Science Foundation of China [21536008]
- National Key R&D Program of China [2016YFB0600902]
Carbon dioxide methanation is of great importance for both environment and energy because of the reduction of carbon dioxide emissions and the utilization of carbon source. In this work, UiO-66 was employed as the support for palladium nanoparticles via a sol-gel method to enhance the activity of CO2 methanation. The physical-chemical properties of as-prepared catalysts were characterized using N-2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscope (TEM), temperature programmed desorption (TPD), temperature programmed reduction (TPR), thermo-gravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that there was a synergistic effect between UiO-66 and supported Pd. CO2 could be activated in UiO-66 via its Zr6O4(OH) 4 nods, while H-2 molecules were dissociated at Pd for further hydrogenation of activated CO2. As a result, the catalyst with a Pd loading of 6 wt.% exhibited a high activity with 56.0% of CO2 conversion and 97.3% of CH4 selectivity, corresponding to a STY of 856 g.h(-1).kg(cat)(-1) at 4 MPa and 340 degrees C.
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