Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (10): 1808-1820.DOI: 10.1016/S1872-2067(21)63789-0
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Sixue Lina, Jing Wanga, Yangyang Mia, Senyou Yanga, Zheng Wangb, Wenming Liua(), Daishe Wua, Honggen Penga()
Received:
2021-02-06
Accepted:
2021-02-24
Online:
2021-10-18
Published:
2021-05-06
Contact:
Wenming Liu,Honggen Peng
About author:
First author contact:†These authors contributed equally to this work.
Supported by:
Sixue Lin, Jing Wang, Yangyang Mi, Senyou Yang, Zheng Wang, Wenming Liu, Daishe Wu, Honggen Peng. Trifunctional strategy for the design and synthesis of a Ni-CeO2@SiO2 catalyst with remarkable low-temperature sintering and coking resistance for methane dry reforming[J]. Chinese Journal of Catalysis, 2021, 42(10): 1808-1820.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63789-0
Fig. 1. (a,b) TEM images of freshly reduced Ni-CeO2@SiO2 catalyst; (c) the particle size distribution of Ni-CeO2@SiO2 catalyst; HAADF-STEM (d) and EDX mapping (e-j) of the freshly reduced Ni-CeO2@SiO2 catalyst; (e) overlap images of Ni, Ce, Si and O species; (f) O mapping image; (g) Si mapping image; (h) Ce mapping image; (i) Ni mapping image; (j) Ni-Ce overlap image; (k) Line scan of freshly reduced Ni-CeO2@SiO2 catalyst.
Fig. 3. Catalytic activities of Ni-CeO2@SiO2, Ni-CeO2/SiO2, Ni/SiO2 catalysts for DRM at different temperatures: (a) CH4 conversion; (b) CO2 conversion. Reaction conditions: WHSV = 18000 mL gcat-1 h-1, p = 1 atm, CH4:CO2 = 1:1.
Fig. 4. (a) Catalytic turnover frequencies (TOF) of CH4 and CO2; (b) Catalytic reaction rates of CH4 and CO2 calculated at 425 °C. Reaction conditions: WHSV = 90000 mL gcat-1 h-1, p = 1 atm, CH4:CO2 = 1:1.
Fig. 6. TEM images and Ni particle size distributions of Ni-CeO2@SiO2 catalyst after 20 h of reaction at 800 °C (a,b), Ni-CeO2@SiO2 catalyst after 100 h of reaction at 800 °C (c,d), Ni-CeO2/SiO2 catalyst after 20 h of reaction at 800 °C (e); (f) XRD pattern of these catalysts after 20 and 100 h of reaction at 800 °C; (g) Raman spectra of all the spent catalysts; (h) TGA curves of all the spent catalysts.
Fig. 7. (a,b) 20 h stability test of Ni-CeO2@SiO2 catalyst: CH4 conversion and CO2 conversion. Reaction conditions: WHSV = 18000 mL gcat-1 h-1, p = 1 atm, CH4:CO2 = 1:1, temperature: 600 °C and H2/CO ratio of after 20 h reaction of the Ni-CeO2NW@SiO2 catalysts catalyst; (c,d) TEM images and Ni particle size distribution of the Ni-CeO2@SiO2 catalyst after 20 h of reaction at 600 °C; (e) TGA curves of the spent catalysts; (f) Raman spectra of the spent catalysts.
Fig. 8. Partial DRIFT spectra of CO2+CH4 adsorbed at different temperatures over Ni-CeO2@SiO2 with the wavelength 1770-2202 cm-1 (a) and 1770-1220 cm-1 (b). Reaction conditions: F(CH4) = F(CO2) = 10 mL min-1, F(N2) = 50 mL min-1.
Fig. 9. DRIFTS spectra of CO2-TPA at different temperatures over Ni-CeO2@SiO2. (b) is a 3D surface diagram explaining Fig. (a). Reaction conditions: F(CO2) = 10 mL min-1, F(N2) = 60 mL min-1.
Fig. 10. (a-c) In situ DRIFTS spectra of CH4-TPD at different temperatures over Ni-CeO2@SiO2. Reaction conditions: F(CH4) = 10 mL min-1, F(N2) = 60 mL min-1.
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