Activity and selectivity enhancement of silica supported cobalt catalyst for alcohols production from syngas via Fischer-Tropsch synthesis

Du, Hong; Jiang, Miao; Zhao, Min; Ma, Xiuyun; Xu, Zhanwei; Zhao, Zihan

doi:10.1016/j.ijhydene.2021.11.070

Cited by 17 publications

(5 citation statements)

References 48 publications

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“…For samples which contain Co, there were two different reduction peaks in the range of 300–500 °C and 600–800 °C, respectively. The mediated reduction peak (300–500 °C) is mainly attributed to the conversion of Co 3+ to Co 2+ and the higher reduction peak (600–800 °C) is the reduction of Co 2+ to Co 0 . ,− Furthermore, the reduction peaks shift to a lower temperature with the increase of Co content, which demonstrated the strong interaction of ions under the perovskite structure. Besides, the lower the Co content, the stronger the interaction of ions is.…”

Section: Catalyst Characterizationmentioning

confidence: 96%

LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas

Song,

Fang,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Cobalt-based catalysts are promising for converting syngas (CO + H 2 ) into higher alcohols, where Co δ+ /Co 0 is the active pair for higher alcohol formation. The challenge lies in how to construct and to adjust the active pair. In this work, the active pair of Co δ+ /Co 0 can be obtained via the interaction between a metal Co nanoparticle (NP) with LaAlO 3 . A series of LaAl 1−x Co x O 3 (x = 0.2−0.5) were supported on ZrO 2 according to the wet-impregnation method with citric acid as the complexing agent, and after reduction, the catalyst of Co−LaAlO 3 /ZrO 2 could be obtained, where cobalt was in the state of Co δ+ /Co 0 , which is the active pair. Co δ+ was formed at the interfaces between Co NPs and LaAlO 3 owing to the interaction between them, and the Co δ+ /Co 0 ratio could be adjusted by the size of Co NPs. In Co δ+ /Co 0 , Co δ+ could adsorb associatively CO and Co 0 could adsorb dissociatively, which catalyzed syngas to higher alcohols synergistically. By the way, there is an electron transformation between Co and LaAlO 3 , which could improve the activity.

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Section: Catalyst Characterizationmentioning

confidence: 96%

LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas

Song,

Fang,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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“…Hong Du and colleagues [50] synthesised a single-metal cobalt catalyst (Co/SiO2-EOAM) by impregnation, using silica pellets modified with ethanolamine as a support for syngas conversion. During catalyst calcination, the combustion of carbon and nitrogen species improved cobalt dispersion while impeding cobalt oxide reduction by promoting cobalt-support contact.…”

Section: Effects Of Preparation On Activity and Product Selectivitymentioning

confidence: 99%

“…Silica, a commonly used support material, offers benefits for instance increased surface area, microporosity and microporosity properties as required [28,[47][48][49][50]. However, the limited interaction between metal catalysts and silica can hinder the crystallites dispersion, thereby reducing the quantity of active sites available for catalysis.…”

Section: Introductionmentioning

confidence: 99%

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Advances on Catalyst Support Modification and their Effect on Fischer Tropsch Synthesis: A Review

Thibanyane,

Gorimbo,

Yao

2024

Preprint

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One important goal of research on heterogeneous catalysis for Fischer Tropsch synthesis (FTS) is to understand the connection linking catalyst morphology and its activity. Development of these effective catalysts highlights the potential for understanding the effectiveness of promoted supported catalysts and revealing their complex and dynamic effects in FTS. The metal-support interaction (MSI) is influenced by the physicochemical and textural features provided by the modified support and can directly influence the sizes of active metal crystallites, reactants and/or products mass transfer, dispersion, mechanical strength, stability and consequently the adsorption-desorption characteristics of the catalyst. Herein, this article explores the general strategies for modifying silica supports (achieved through doping, coating, or promoting the support or support precursor) and how these strategies can be manipulated to further alter catalyst performance and product selectivity by enhancing the amount of active metal species and improving the intrinsic turnover frequency (TOF). Furthermore, the review emphasises a new strategy (the inverse model of the silica support modification) aiming at overcoming the challenges posed by active metal coating or coverage, as well as pore blockages by promoters that occur during conventional preparation of promoted silica supported FT catalysts.

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“…Among them, Co 0 –CoO x achieved high ROH selectivity and C 2+ OH distribution (more than 40 and 70%, respectively). By introducing reducible oxide promoters or regulating metal–support interactions, , the formation of CoO could be promoted, but the effect of crystal structures of CoO species has not been discussed yet.…”

Section: Introductionmentioning

confidence: 99%

Zinc Blende CoO as an Efficient CO Nondissociative Adsorption Site for Direct Synthesis of Higher Alcohols from Syngas

Li,

Luo,

et al. 2024

ACS Catal.

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Monometallic Co 0 −Co δ+ catalysts have shown considerable potential in higher alcohol synthesis (HAS) direct from syngas, however, the alcohol selectivity and catalyst stability still need to be promoted. Here, we prepared a series of cobalt silicate hydroxidederived catalysts and surprisingly obtained tetrahedrally coordinated zinc blende CoO (Z-CoO) during reduction and reaction. The nanoscale close interacted Co 0 -Z-CoO achieved an ROH selectivity of 64.4%, a higher alcohol (HA) selectivity of 43.6%, and a space time yield (STY) toward HA of 42.0 mmol•g Co −1•h −1 , which outperformed most of the reported Co-based HAS catalysts. In addition, as a contrast, the commonly obtained rocksalt CoO (R-CoO) with octahedral structure was prepared. It is proved that Z-CoO serves as the CO nondissociative adsorption site, which exhibits a much stronger adsorption capability compared to R-CoO and Co 2 C, greatly facilitating the alcohol formation. Moreover, unlike the R-CoO, there were barely no phase transition of Z-CoO during HAS reaction, contributing to the catalyst stability over 550 h reaction. This work offers a facile preparation method and insights of zinc blende CoO as promising high-performance active sites for HAS.

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Activity and selectivity enhancement of silica supported cobalt catalyst for alcohols production from syngas via Fischer-Tropsch synthesis

Cited by 17 publications

References 48 publications

LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas

LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas

Advances on Catalyst Support Modification and their Effect on Fischer Tropsch Synthesis: A Review

Zinc Blende CoO as an Efficient CO Nondissociative Adsorption Site for Direct Synthesis of Higher Alcohols from Syngas

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Activity and selectivity enhancement of silica supported cobalt catalyst for alcohols production from syngas via Fischer-Tropsch synthesis

Cited by 17 publications

References 48 publications

LaAlO3-Tailored Active Pairs of Co0–Coδ+ Supported on ZrO2 for Higher Alcohol Synthesis from Syngas

LaAlO3-Tailored Active Pairs of Co0–Coδ+ Supported on ZrO2 for Higher Alcohol Synthesis from Syngas

Advances on Catalyst Support Modification and their Effect on Fischer Tropsch Synthesis: A Review

Zinc Blende CoO as an Efficient CO Nondissociative Adsorption Site for Direct Synthesis of Higher Alcohols from Syngas

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Product

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LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas

LaAlO₃-Tailored Active Pairs of Co⁰–Co^δ+ Supported on ZrO₂ for Higher Alcohol Synthesis from Syngas