Citation:
WANG Yong-zhao, LI Feng-mei, CHENG Hui-min, FAN Li-yuan, ZHAO Yong-xiang. A comparative study on the catalytic properties of high Ni-loading Ni/SiO2 and low Ni-loading Ni-Ce/SiO2 for CO methanation[J]. Journal of Fuel Chemistry and Technology,
;2013, 41(8): 972-977.
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Two Ni-based catalysts of 13%Ni/SiO2(13Ni/Si) and 7%Ni-2%Ce/SiO2(7Ni-2Ce/Si, by weight) were prepared by the incipient-wetness impregnation method and characterized with N2-sorption, XRD, H2-TPR, FT-IR, TEM, H2-TPD and CO-TPD techniques. It was shown that addition of Ce promoter generated an interaction among NiO, CeO2 and SiO2, which changed chemical environment of Ni-O-Si bond, enhanced the dispersion and reduction of NiO, and increased the active surface area. In particular, a new type of moderately strong CO adsorption sites was formed on the surface of the 7Ni-2Ce/Si catalyst. As a result, the low Ni-loading 7Ni-2Ce/Si catalyst exhibited higher CO adsorption capacity and CO methanation catalytic activity than the high Ni-loading 13Ni/Si. Under the reaction conditions of 1% CO (volume fraction in H2 atmosphere), GHSV of 7 000 h-1 and atmospheric pressure, the temperature for complete conversion of CO over the 7Ni-2Ce/Si catalyst was 230 ℃, being 30 ℃ lower than that found over the high Ni loading 13Ni/Si catalyst.
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Keywords:
- CO methanation,
- Ni-Ce/SiO2 catalyst,
- cerium promoter,
- Ni loading
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