4.7 Article

Tailoring the yttrium content in Ni-Ce-Y/SBA-15 mesoporous silicas for CO2 methanation

期刊

CATALYSIS TODAY
卷 382, 期 -, 页码 104-119

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ELSEVIER
DOI: 10.1016/j.cattod.2021.07.031

关键词

CO2 methanation; SBA-15; Nickel; Ce-Y promoters; Synergy

资金

  1. China Scholarship Council (CSC)
  2. MSCA-IF at Norwegian University of Science and Technology in Norway
  3. European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [892571]
  4. Norwegian Research Council [275182, 262644]
  5. Marie Curie Actions (MSCA) [892571] Funding Source: Marie Curie Actions (MSCA)

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A series of nickel-cerium-promoted mesoporous silica (SBA-15) catalysts modified with different loadings of yttrium were synthesized and tested in CO2 methanation reaction. The best catalytic performance was found for the Y-modified 15Ni10Ce10Y/SBA-15 catalyst with 10% yttrium loading, showing the highest CO2 conversion of 61% ± 2% and stable performance.
A series of nickel-cerium-promoted mesoporous silica (SBA-15) catalysts modified with different loadings of yttrium were synthesized by cetyltrimethylammonium bromide (CTAB)-assisted impregnation. The catalysts were tested in CO2 methanation reaction and characterized by N-2 sorption, X-ray fluorescence (XRF), small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (XRD), H-2 chemisorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H-2 temperature-programmed reduction (H-2-TPR), CO2 temperature-programmed desorption (CO2-TPD), and thermogravimetric analysis coupled with mass spectrometry (TGA-MS). The best catalytic performance in CO2 methanation was found for Y-modified NiCe/SBA-15 catalysts compared to the unpromoted sample. The modification with 10 wt% of yttrium gave the highest CO2 conversion of 61% +/- 2% at 350 degrees C. We attribute this increase to an improved dispersion of Ni, increased reducibility of Ni species, higher ratio of Ce3+/(Ce3+ + Ce4+), and increased moderate basicity found for 15Ni10Ce10Y/SBA-15. This paper shows that 10 wt% of Y loading not only improves the catalytic activity in CO2 methanation, but also gives stable performance. The tested 15Ni10Ce10Y/SBA-15 catalyst did not exhibit activity loss during 26 h of time-on-stream (TOS) experiment at 350 degrees C. Moreover, carbon deposits and sintered nickel particles could hardly be found in 15Ni10Ce10Y/SBA-15 catalyst used for 7 h.

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