ZSM-5 Supported Cobalt Catalyst for the Direct Production of Gasoline Range Hydrocarbons by Fischer–Tropsch Synthesis

Kang, Suk-Hwan; Ryu, Jee-Youl; Kim, Jin-Ho; Prasad, P. S. Sai; Bae, Jong Wook; Cheon, Jooyoung; Jun, Ki‐Won

doi:10.1007/s10562-011-0626-y

Cited by 57 publications

(27 citation statements)

References 25 publications

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“…In addition to the two main reduction peaks, a third peak at around 650°C (peak III) was also observed for Co/ZS-50 and Co/ZS-100, being more apparent on the latter. This might be caused by the reduction of more stable species, such as cobalt aluminate or cobalt silicate on the ZSM-5 support [45]. The high CH 4 selectivity of FTS over Co/ZS-0 and the large amount of C 23+ production over Co/ZS-100 were consistent with the literature report [24] that the CH 4 selectivity was enhanced on the CoO surface and the high reducibility of Co 3 O 4 was beneficial to the production of long-chain hydrocarbons.…”

Section: Reduction Behaviour Of Catalystsmentioning

confidence: 99%

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

Han

et al. 2015

Fuel Processing Technology

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a b s t r a c t a r t i c l e i n f oA series of ZSM-5/SBA-15 composite supported Co catalysts were prepared and evaluated for the Fischer-Tropsch synthesis (FTS) aimed to maximise the selectivity of C 5 -C 22 hydrocarbons in the product. The composite support was prepared by physically mixing ZSM-5 and SBA-15 of varying proportions and the finished catalysts had a constant Co loading of 15wt.%. The catalysts were tested for their performance in a high pressure fixed-bed reactor operating at T = 240°C, P = 2.0 MPa, H 2 /CO = 2 and GHSV = 1000 h −1. The composite supported catalysts were shown to have much improved catalytic performance over the respective single material supported catalysts. The catalyst with 20wt.% ZSM-5 in the composite support gave the maximum CO conversion (90.6%), maximum selectivity of C 5 -C 22 hydrocarbons (70.0%) and minimum selectivity of light hydrocarbons (13.3% for CH 4 and 7.0% for C 2 -C 4 alkanes). The catalysts were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy with an energy dispersive X-ray spectrometer, temperature programmed desorption and temperature programmed reduction. It was revealed that the superior catalytic performance can be attributed to the large pore size and high dispersion of Co 3 O 4 , which afforded an optimum reducibility and acid site density.

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Section: Reduction Behaviour Of Catalystsmentioning

confidence: 99%

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

Han

et al. 2015

Fuel Processing Technology

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“…5. As stated in literature [31,32], there are two typical reduction steps under the flow of H 2 for cobalt and nickelbased catalysts corresponding to v 3 O 4 ? vO, and then ) which implied that the interaction between support and metal oxides is weaker [33].…”

Section: Reduction and Aciditymentioning

confidence: 84%

“…The observed peak within the range of 200-400°C relates to a medium acidity site of the catalyst. The appeared peaks upon the 500°C also are due to the strong acidity sites [14,32,34]. For each catalyst three acid sites with different strengths expressed as the ammonia uptake are observed.…”

Section: Reduction and Aciditymentioning

confidence: 91%

How do the preparation methods impact the kinetic parameters of the two Co/Ni/Al2O3 nanocatalysts in Fischer–Tropsch process?

2015

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The influence of the preparation methods on the kinetics of Fischer-Tropsch (FT) synthesis in a fixed-bed reactor is investigated by kinetic tests employing two 80 %Co/20 %Ni/Al 2 O 3 catalysts prepared through: (a) cogelling support and cobalt, as well as nickel (SG), and (b) impregnating cobalt and nickel with sol-gel derived support (IM-SG). The kinetics for both the catalysts is developed on the basis of Langmuir-Hinshelwood-Hougen-Watson (LHHW) type models at the same range: T = 200-250°C, P = 1-10 bar, gas hourly space velocity (GHSV) = 4200 h -1 and H 2 /CO mole ratio of 1/1-3/1. According to the enolic and carbide mechanisms, eight kinetic expressions of the CO consumption rate have been tested. The achieved best fitted model is subject to a good correlation between experimental and theoretical data; and the kinetic parameters are estimated by the use of Levenberg-Marquardt algorithm. Kinetic parameters such as rate constant (k) and activation energy (E a ) suggest that the preparation method remarkably impact the FT behavior. The IM-SG sample was selected as the better catalyst due to a higher reaction rate and less activation energy comparing with the SG catalyst. Graphical abstract

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“…Various metal promoters such as alkali, alkali earth elements, and rare earth elements were reported to increase the activity of alumina supported cobalt catalyst. These metal additives would improve the interaction of Al 2 O 3 support with Co oxide and thereby increase the Co reducibility and the number of active Co metal sites [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

2015

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This work deals with the effect of adding Na to bimetallic sol-gel derived alumina supported Co/Ni nanocatalysts in Fischer-Tropsch synthesis. The catalyst activity and selectivity changed with different levels of Na, and the catalyst with 2 % Na loading was selected as an optimal catalyst to compare with un-promoted Co/Ni/ Al 2 O 3 catalyst. Na reduced the methane selectivity by increasing the chain-growth probability (a-value) at 12 bar. The results of physico-chemical characterizations show that the Na promoter plays a significant role in the catalytic structure. Additionally, the kinetic behavior was considered in absence and presence of Na over CoNi/Al 2 O 3 catalysts. We applied an enolic approach, which was developed based on the interaction between adsorption HCO and dissociated adsorption hydrogen, through the Langmuir-Hinshelwood-Hougen-Watson (LHHW) adsorption theory. Kinetic parameters, including the rate constant (k) and activation energy (E a ) of the catalysts, were also determined. The results show that, by adding Na, the activation energy (E a ) decreases and the reaction rate (-R CO ) increases. Graphical Abstract

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ZSM-5 Supported Cobalt Catalyst for the Direct Production of Gasoline Range Hydrocarbons by Fischer–Tropsch Synthesis

Cited by 57 publications

References 25 publications

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

How do the preparation methods impact the kinetic parameters of the two Co/Ni/Al2O3 nanocatalysts in Fischer–Tropsch process?

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

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