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. 2023 Sep 8;6(18):9475-9486.
doi: 10.1021/acsaem.3c01432. eCollection 2023 Sep 25.

Cobalt Stabilization through Mesopore Confinement on TiO2 Support for Fischer-Tropsch Reaction

F Platero  1 , S Todorova  2 , L Aoudjera  3 , L Michelin  4   5 , B Lebeau  4   5 , J L Blin  3 , J P Holgado  1 , A Caballero  1 , G Colón  1
Affiliations

Cobalt Stabilization through Mesopore Confinement on TiO2 Support for Fischer-Tropsch Reaction

F Platero et al. ACS Appl Energy Mater. .

Abstract

Cobalt supported on mesostructured TiO2 catalysts has been prepared by a wet-impregnation method. The Co/TiO2 catalytic system showed better catalytic performance after support calcination at 380 °C. Co nanoparticles appeared well distributed along the mesopore channels of TiO2. After reduction pretreatment and reaction, a drastic structural change leads to mesopore structure collapse and the dispersion of the Co nanoparticles on the external surface. Along this complex process, Co species first form discrete nanoparticles inside the pore and then diffuse out as the pore collapses. Through this confinement, a strong metal-support interaction effect is hindered, and highly stable metal active sites lead to better performance for Fischer-Tropsch synthesis reaction toward C5+ products.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Schematic representation of the synthesis route used to prepare the catalysts of cobalt on TiO2 mesoporous.
Figure 2
Figure 2
SAXS patterns of amorphous TiO2 (black line), pristine TiO2 obtained after calcination (red line), and Co/TiO2 (blue line) for (a) TiO2-300, (b) TiO2-340, and (c) TiO2-380.
Figure 3
Figure 3
Nitrogen adsorption–desorption isotherm with the corresponding pore size distribution for (a) amorphous TiO2, (b) TiO2-300, (c) TiO2-340, and (d) TiO2-380.
Figure 4
Figure 4
TEM images for (a) TiO2-300, (b) TiO2-340, and (c, d) TiO2-380 supports.
Figure 5
Figure 5
HAADF-STEM images of the Co/TiO2-300 (a), Co/TiO2-340 (b), and Co/TiO2-380 (c, d) catalysts.
Figure 6
Figure 6
X-ray diffraction patterns for (a) mesoporous TiO2 supports and (b) Co supported catalysts.
Figure 7
Figure 7
H2-TPR profiles for Co/P90 and Co/TiO2 catalysts.
Figure 8
Figure 8
Evolution of the Co2p signal from XPS analysis during reduction treatment for Co/P90 and Co/TiO2 catalysts.
Figure 9
Figure 9
Co evolution during reduction treatment on the Co/TiO2-380 catalyst.
Figure 10
Figure 10
(a) CO conversion rates and (b) products selectivity in FTS reaction. Constant reaction conditions: 0.25 g of catalyst diluted in 0.25 g of SiC, T = 260 °C P = 1 MPa, GHSV = 4200 h–1, CO:H2:N2 = 1:2:2.
Figure 11
Figure 11
(a) CO conversion rate and (b) products selectivity during FTS reaction for Co/TiO2-380 and Co/P90 catalysts. Constant reaction conditions: 0.25 g of catalyst diluted in 0.25 g of SiC, T = 260 °C P = 1 MPa, GHSV = 4200 h–1, CO:H2:N2 = 1:2:2.
Figure 12
Figure 12
HAADF-STEM images for Co/P90 (upper row) and Co/TiO2-380 (lower row) after reduction at 260 °C.
Figure 13
Figure 13
HAADF-STEM images for (a) Co/P90 and (b) Co/TiO2-380 catalysts after FTS reaction at 260 °C.
See this image and copyright information in PMC

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