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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

邮发代号 80-969

2019 Impact Factor: 3.552

Frontiers of Chemical Science and Engineering  2022, Vol. 16 Issue (8): 1224-1236   https://doi.org/10.1007/s11705-022-2139-1
  本期目录
The modification of titanium in mesoporous silica for Co-based Fischer–Tropsch catalysts
Xin Li1,2,3, Meng Su1,2, Yao Chen1,2, Mehar U. Nisa1,2, Ning Zhao1,2, Xiangning Jiang1,2, Zhenhua Li1,2()
1. Key Lab for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
3. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
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Abstract

Ordered SBA-15 mesoporous silica with incorporated titanium was successfully synthesized via a one-pot hydrothermal crystallization method. The characterization including powder X-ray diffraction, Brunauer–Emmett–Teller, transmission electron microscope, temperature-programmed reduction, temperature-programmed desorption, Fourier transform infrared and ultraviolet-visible-near infrared spectrometer was performed to explore the physical and chemical structures of both the supports and the catalysts. The results showed that titanium was successfully incorporated into the mesoporous silica framework with a limited amount of titanium (Si/Ti > 20), and the mesoporous structure was retained. However, the increased titanium content inevitably resulted in the formation of anatase TiO 2 particles on the support surface. The increased incorporated titanium strengthened the interactions between cobalt species and supports, which was favorable for the cobalt species dispersion, despite the limited cobalt oxide reducibility. The enhanced metal-support interactions were beneficial for the CO/H2 ratio at the active cobalt sites, which facilitated the formation of more C5+ hydrocarbons. This study provides a promising method for support modification with incorporated-heteroatoms for the rational development of Fischer–Tropsch catalysts.

Key wordsFischer–Tropsch synthesis    titanium incorporation    mesoporous silica    metal-support interactions    C5+ selectivity
收稿日期: 2021-08-13      出版日期: 2022-08-02
Corresponding Author(s): Zhenhua Li   
 引用本文:   
. [J]. Frontiers of Chemical Science and Engineering, 2022, 16(8): 1224-1236.
Xin Li, Meng Su, Yao Chen, Mehar U. Nisa, Ning Zhao, Xiangning Jiang, Zhenhua Li. The modification of titanium in mesoporous silica for Co-based Fischer–Tropsch catalysts. Front. Chem. Sci. Eng., 2022, 16(8): 1224-1236.
 链接本文:  
https://academic.hep.com.cn/fcse/CN/10.1007/s11705-022-2139-1
https://academic.hep.com.cn/fcse/CN/Y2022/V16/I8/1224
Fig.1  
Sample Si/Ti ratio SBET/(m2·g−1) a) Vt/(cm3·g−1) b) DP/nm c)
SBA-15 +∞ 815 1.12 6.72
OMST80 80 556 0.73 6.54
OMST60 60 491 0.72 6.31
OMST40 40 452 0.67 6.30
OMST20 20 494 0.78 6.20
OMST10 10 470 0.87 6.25
Co/SBA-15 +∞ 472 0.61 6.28
Co/OMST80 80 462 0.55 6.29
Co/OMST60 60 464 0.64 6.30
Co/OMST40 40 411 0.60 5.98
Co/OMST20 20 425 0.60 5.73
Tab.1  
Fig.2  
Sample SBA-15 OMST80 OMST60 OMST40 OMST20 OMST10
Si/Ti +∞ 80 60 40 20 10
Theoretical Ti/wt% 0 0.98 1.30 1.93 3.73 7.03
Actual Ti/wt% 0 0.95 1.26 1.86 3.60 6.86
Loss ratio/wt% 0 3.01 3.00 3.50 3.61 2.44
Tab.2  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
Fig.7  
Catalyst Co/SBA-15 Co/OMST80 Co/OMST60 Co/OMST40 Co/OMST20 Co/OMST10
Co3O4 size from XRD a)/nm 15.3 11.7 11.7 11.7 11.3 11.2
Co3O4 size from TEM b)/nm 11.94 10.81 10.46 10.57 10.38 9.98
Tab.3  
Fig.8  
Fig.9  
Fig.10  
Catalyst Adsorbed CO/(mmol·gCo−1) Adsorbed H2/(mmol·gCo−1) CO/H2 ratio
Co/SBA-15 0.28 0.14 2.00
Co/OMST80 0.25 0.11 2.27
Co/OMST60 0.20 0.09 2.22
Co/OMST40 0.19 0.09 2.11
Co/OMST20 0.01 0.01 1.00
Co/OMST10 0.01 0.01 1.00
Tab.4  
Catalyst a) XCO/% CTYc)/(10−4 molCO·gCo−1·s−1) CO2 selectivity/% Hydrocarbon selectivity/% C=/C(C2−4)
CH4 C2 C3 C4 C5+
Co/SBA-15 b) 69.0 1.02 1.2 20.6 2.2 4.6 3.9 68.8 0.23
Co/OMST80 47.28 0.70 1.3 13.91 1.21 3.43 3.59 77.66 0.50
Co/OMST60 42.91 0.63 1.2 14.94 1.42 4.02 4.23 75.39 0.52
Co/OMST40 40.05 0.59 1.1 15.25 1.47 4.05 4.15 75.09 0.52
Co/OMST20 25.32 0.38 1.0 17.40 2.33 6.55 6.31 67.42 0.99
Co/OMST10 23.29 0.34 1.0 18.47 2.35 6.71 6.95 65.52 0.80
Tab.5  
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