A zirconium modified Co/SiO2 Fischer-Tropsch catalyst prepared by dielectric-barrier discharge plasma

Jiang, Yunhui; Fu, Tingjun; Lü, Jing; Li, Zhenhua

doi:10.1016/s2095-4956(13)60066-2

Cited by 28 publications

(22 citation statements)

References 26 publications

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“…The first peak typically corresponded to the reduction of Co 3 O 4 to CoO through the reaction Co 3 O 4 + H 2 → 3CoO + H 2 O and the second peak was mainly ascribed to the second step of reduction from CoO to metallic cobalt by reaction CoO + H 2 → Co 0 + H 2 O that verify the XRD patterns. These observations were in agreement with those given in the previous works [3,10,16,18,21] . Table 4 shows the specific reduction temperatures corresponding to those demonstrated in Fig.…”

Section: The Characterization Of the Synthesized Catalystssupporting

confidence: 93%

“…The previous investigations have demonstrated that the Ru-promoted cobalt catalysts result in enhancement of the long-chain n-paraffins selectivity and catalytic activity in comparison with non-promoted catalysts supported by some common inorganic oxides (e.g. SiO 2 , Al 2 O 3 , ZrO 2 ,TiO 2 ) [7,[16][17][18][19][20][21] . Moreover, it has been shown that the two factors of metal dispersion and its interaction with the support material play major role in catalytic performance of FTS.…”

Section: Introductionmentioning

confidence: 99%

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Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Shariati

Haghtalab

Mosayebi

2019

Journal of Energy Chemistry

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Section: The Characterization Of the Synthesized Catalystssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Shariati

Haghtalab

Mosayebi

2019

Journal of Energy Chemistry

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“…The representative map shown in Figure 4A illustrates the lack of spatial association between the Zr and Co as well as an absence of ZrO2 nanoparticles. Most studies of Zr-promoted Co catalysts report a similar lack of large ZrO2 domains, which generally has been inferred from the lack of peaks corresponding to ZrO2 in XRD spectra (48). The extent to which ZrO2 associates with the Co versus the support has been investigated less rigorously though.…”

Section: Structure and Chemical State Of The Zr Promotermentioning

confidence: 99%

Role of ZrO₂ in Promoting the Activity and Selectivity of Co-Based Fischer–Tropsch Synthesis Catalysts

Johnson

Bell

2015

ACS Catal.

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The effects of Zr promotion on the structure and performance of Co-based Fischer-Tropsch synthesis (FTS) catalysts were investigated. Inclusion of Zr in the catalysts was found to increase the FTS turnover frequency and the selectivity to C5+ hydrocarbons and to decrease the selectivity to methane under most operating conditions. These improvements to the catalytic performance are a function of Zr loading up to an atomic ratio of Zr/Co = 1.0, above which the product selectivity is insensitive to higher concentrations of the promoter. Characterization of the Co nanoparticles by different methods demonstrated that the optimal Zr loading corresponds to half monolayer coverage of the Co surface by the promoter. Measurements of the rate of FTS at different pressures and temperatures established that the kinetics data for both the Zr-promoted and unpromoted catalysts are described by a twoparameter Langmuir-Hinshelwood expression. The parameters used to fit this rate law to the experimental data indicate that the apparent rate coefficient and the CO adsorption constant for the Zrpromoted catalysts are higher than those for the unpromoted catalyst. Elemental mapping by means of STEM-EDS provided evidence that Zr is highly dispersed over the catalyst surface and has limited preference for association with the Co nanoparticles. In situ X-ray absorption spectroscopy confirmed the absence of mixing between the Zr and Co in the nanoparticles. These results suggest that Zr exists as a partial layer of ZrO2 on the surface of the Co metal nanoparticles. Accordingly, it is proposed that Zr promotion effects originate from sites of enhanced activity at the interface between Co and ZrO2. The possibility that ZrO2 acts as a Lewis acid to assist in CO dissociation as well as to increase the ratio of CO to H adsorbed on the catalyst surface is discussed.

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“…Jiang et al 85 reported that cobalt catalysts supported on zirconium-modified silica treated using dielectric-barrier discharge (DBD) plasma instead of the conventional thermal calcination step exhibited significantly enhanced cobalt reducibility and increased cobalt dispersion compared with the catalysts on unmodified silica. As a result, plasma-treated cobalt catalysts supported on Zr/SiO 2 displayed higher CO conversions and hydrocarbon chain growth ability in FT synthesis (20 wt % Co, 230°C, 20 bar, H 2 /CO = 2).…”

Section: Silica-supported Catalystsmentioning

confidence: 99%

Effect of the Support and Its Surface Modifications in Cobalt-Based Fischer–Tropsch Synthesis

Munirathinam

Minh

Nzihou

2018

Ind. Eng. Chem. Res.

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Support effects in heterogeneous catalysis are evolving as an important field of investigation to optimize catalyst properties. The cobalt-based Fischer−Tropsch (FT) catalysts usually consist of metallic cobalt nanocrystallites dispersed on a support material. The present review surveys the progress that has been made over the last couple of decades in the area of the effect of the support and its surface modifications in cobalt-based FT synthesis. Different catalyst supports such as alumina, silica, titania, niobia, zirconia, zeolite, ceria, carbon-based materials, silicon carbide, aluminum phosphate, hydrotalcite, metal−organic frameworks, and metal foams are discussed and compared with classical supports like alumina or silica wherever permitted. Properties such as metal−support interactions, the support-induced size and morphology of the cobalt nanocrystallites (textural properties of the support), changes in the electronic properties of the cobalt clusters, and the acid/base nature of the support are examined, and wherever possible the activity and/or selectivity in FT synthesis is discussed. This review also summarizes findings on new and promising supports for FT catalysts. Guidance for support modifications and choice of the support as functions of the product selectivity in the FT process is also proposed. Figure 1. Effect of Zr loading and pore size on (a) CO rate, (b) CH 4 selectivity, and (c) C 5+ selectivity. Reaction conditions: 220°C, 22 bar, H 2 / CO = 2.1, X CO = 49−51%. Adapted with permission from ref 49.

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A zirconium modified Co/SiO2 Fischer-Tropsch catalyst prepared by dielectric-barrier discharge plasma

Cited by 28 publications

References 26 publications

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Role of ZrO₂ in Promoting the Activity and Selectivity of Co-Based Fischer–Tropsch Synthesis Catalysts

Effect of the Support and Its Surface Modifications in Cobalt-Based Fischer–Tropsch Synthesis

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A zirconium modified Co/SiO2 Fischer-Tropsch catalyst prepared by dielectric-barrier discharge plasma

Cited by 28 publications

References 26 publications

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Role of ZrO2 in Promoting the Activity and Selectivity of Co-Based Fischer–Tropsch Synthesis Catalysts

Effect of the Support and Its Surface Modifications in Cobalt-Based Fischer–Tropsch Synthesis

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Role of ZrO₂ in Promoting the Activity and Selectivity of Co-Based Fischer–Tropsch Synthesis Catalysts