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Effects of Weak Surface Modification on Co/SiO2 Catalyst for Fischer-Tropsch Reaction.

Ning W, Shen H, Jin Y, Yang X - PLoS ONE (2015)

Bottom Line: The effects of surface modification on Co/SiO2 catalyst are studied by changing the operating sequences of surface modification and cobalt impregnation in the catalyst preparation.Surface modification before cobalt impregnation makes Co3O4 particle small and dispersed into the deep part of enlarged pore in SiO2, while surface modification after cobalt impregnation does not obviously change the particle size of Co3O4.The improved amplitude of catalytic activity is similar for the two kinds of catalysts, but they are benefited from different factors.

View Article: PubMed Central - PubMed

Affiliation: College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China.

ABSTRACT
A weak surface modification is applied to Co/SiO2 catalyst by hydrothermal treatment at 180°C for 5 h. Aluminum is introduced to Co/SiO2 catalysts during the surface modification. The effects of surface modification on Co/SiO2 catalyst are studied by changing the operating sequences of surface modification and cobalt impregnation in the catalyst preparation. Surface modification before cobalt impregnation makes Co3O4 particle small and dispersed into the deep part of enlarged pore in SiO2, while surface modification after cobalt impregnation does not obviously change the particle size of Co3O4. The improved amplitude of catalytic activity is similar for the two kinds of catalysts, but they are benefited from different factors. The content of iso-hydrocarbons in the products is increased by the surface modifications.

No MeSH data available.


H2-TPR profiles of modified Co/SiO2 catalysts.5% H2/Ar, 24L/(h·g-cat), 10°C/min.
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pone.0124228.g004: H2-TPR profiles of modified Co/SiO2 catalysts.5% H2/Ar, 24L/(h·g-cat), 10°C/min.

Mentions: Fig 4 compares the reducibility of CS, PCS and CPS in H2-TPR. There are two main peaks in the range of 250°C–520°C. They are from the two sequential reductions of Co3O4 to Co0 with CoO as intermediate [9,12–15]. A minor peak around 190°C appears for CS and CPS. It is resulted from the reduction of cobalt nitrate which was remained in CS and CPS in spite of they were calcinated at 400°C [9,14,15]. But the cobalt nitrate remained in CS was decomposed during the followed surface modification, because the peak around 190°C is not observed for PCS. Similarly, the peak above 650°C in PCS is weaker than those in CS and CPS. These indicate that the surface property of CS is changed by the surface modification.


Effects of Weak Surface Modification on Co/SiO2 Catalyst for Fischer-Tropsch Reaction.

Ning W, Shen H, Jin Y, Yang X - PLoS ONE (2015)

H2-TPR profiles of modified Co/SiO2 catalysts.5% H2/Ar, 24L/(h·g-cat), 10°C/min.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4418669&req=5

pone.0124228.g004: H2-TPR profiles of modified Co/SiO2 catalysts.5% H2/Ar, 24L/(h·g-cat), 10°C/min.
Mentions: Fig 4 compares the reducibility of CS, PCS and CPS in H2-TPR. There are two main peaks in the range of 250°C–520°C. They are from the two sequential reductions of Co3O4 to Co0 with CoO as intermediate [9,12–15]. A minor peak around 190°C appears for CS and CPS. It is resulted from the reduction of cobalt nitrate which was remained in CS and CPS in spite of they were calcinated at 400°C [9,14,15]. But the cobalt nitrate remained in CS was decomposed during the followed surface modification, because the peak around 190°C is not observed for PCS. Similarly, the peak above 650°C in PCS is weaker than those in CS and CPS. These indicate that the surface property of CS is changed by the surface modification.

Bottom Line: The effects of surface modification on Co/SiO2 catalyst are studied by changing the operating sequences of surface modification and cobalt impregnation in the catalyst preparation.Surface modification before cobalt impregnation makes Co3O4 particle small and dispersed into the deep part of enlarged pore in SiO2, while surface modification after cobalt impregnation does not obviously change the particle size of Co3O4.The improved amplitude of catalytic activity is similar for the two kinds of catalysts, but they are benefited from different factors.

View Article: PubMed Central - PubMed

Affiliation: College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China.

ABSTRACT
A weak surface modification is applied to Co/SiO2 catalyst by hydrothermal treatment at 180°C for 5 h. Aluminum is introduced to Co/SiO2 catalysts during the surface modification. The effects of surface modification on Co/SiO2 catalyst are studied by changing the operating sequences of surface modification and cobalt impregnation in the catalyst preparation. Surface modification before cobalt impregnation makes Co3O4 particle small and dispersed into the deep part of enlarged pore in SiO2, while surface modification after cobalt impregnation does not obviously change the particle size of Co3O4. The improved amplitude of catalytic activity is similar for the two kinds of catalysts, but they are benefited from different factors. The content of iso-hydrocarbons in the products is increased by the surface modifications.

No MeSH data available.