Structure and catalytic performance of alumina-supported copper–cobalt catalysts for carbon monoxide hydrogenation

Wang, Jingjuan; Чернавский, П. А.; Khodakov, Andreï Y.; Wang, Ye

doi:10.1016/j.jcat.2011.10.012

Cited by 201 publications

(146 citation statements)

References 81 publications

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“…A number of studies have highlighted the potential of using CoCu in this area. [2][3][4][5][6] The underlying motivation for using CoCu as a Fischer-Tropsch catalyst is to obtain more C 2+ alcohols in the product stream, which would be highly desirable in the production of transport fuels. In a detailed screen of CuCoCr industrial catalysts, selectivity towards C1-C6 alcohols for a catalyst comprising predominantly Cu and Co was reported (although the molecular level structure of the material was not well understood).…”

Section: Introductionmentioning

confidence: 99%

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization

et al. 2013

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Publisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in The Journal of Physical Chemistry C, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://pubs.acs.org/doi/abs/10.1021/jp405745n. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractIn this paper, we report the colloidal synthesis and detailed characterization of 11 nm bimetallic CoCu nanoparticle catalysts. Presently Co and Cu is an attractive combination because of their respective properties for industrially important Fischer-Tropsch and methanol synthesis reactions of CO (and CO 2 ) with H 2 . We report the preparation of catalysts by deposition of bimetallic metal nanoparticles both within mesoporous silica (MCF-17) and on the native oxide surface of a silicon wafer. Subsequent phase separation into phasesegregated (i.e. dimer) particles is found to occur upon redox treatment. These nanoparticle catalysts have then been investigated using an array of techniques including synchrotronbased Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) and in situ Near Edge and Extended X-ray Absorption Fine Structure (NEXAFS / EXAFS) spectroscopies. CO 2 hydrogenation is used as a probe reaction. All three techniques combine to show that an oxygen atmosphere segregates copper to the surface. In doing so the oxygen produces oxides of both Co and Cu metals. Significant hydrogen pressure and temperature are required to fully re-reduce both metals to a metallic state as demonstrated by NEXAFS spectroscopy.Under the conditions of the CO 2 / H 2 reaction monitored in situ using NEXAFS spectroscopy, both metals exist in a fully reduced state at 2.7 bar, 1:3 CO 2 :H 2 and 260°C.2

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Section: Introductionmentioning

confidence: 99%

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization

et al. 2013

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“…The similar conclusion was also proposed by other researchers. 28,29 Hence, the first broad peak in the CoCu/CNTs samples was attributed to the reduction of copper and cobaltous oxide. Additionally, a broad peak at ca.…”

Section: Catalytic Performance Evaluationmentioning

confidence: 98%

“…[1][2][3] The alcohols obtained from this process can be used as fuel blends or as value-added chemicals in fine chemical synthesis. 4,5 Furthermore, higher alcohols synthesis (HAS) is a prototypical example of reactions that rely on synergistic effects between dual catalytic sites with different functionalities, one active site catalysis CO dissociation, while the second site enables CO non-dissociation centers to form. 6 Typically, among the available non-precious metal catalysts, modified bimetallic Fischer-Tropsch (FT) catalysts (e.g., CuCo) are widely investigated as one of the most promising candidates for HAS.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Wang

Zhuang

et al. 2017

J. Braz. Chem. Soc.

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A series of carbon nanotube (CNTs)-supported copper-cobalt catalysts were prepared and investigated in a slurry reactor for their ability to selectively convert syngas into higher carbon number alcohols. The 7.5Cu7.5Co/CNTs catalyst achieved superior selectivity towards the formation of ethanol (30.1%) and C 2+ alcohols (57.7%), while the 10Co5Cu/CNTs catalyst exhibited the largest alcohol space-time yield (372.9 mg g cat -1 h -1). However, the pure Cu (15Cu/CNTs) catalyst displayed negligible activity. Cobalt reduction was enhanced in the presence of copper. In addition to the Cu 0 -Co 0 center, Co 0 -Co 2+ also presented dual active sites for higher alcohols synthesis, the Co 2+ site could terminate carbon chain growth to produce alcohols. The ratio of Cu/Co considerably influences the metal particle properties-synergistically effecting the active species.

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“…These acid sites are related to the contribution of different metal oxides, although the contribution of Al 2 O 3 is probably predominant. 22 Generally, the weak adsorption peak in the low temperature region is due to weak acid sites or hydrogen bonding to the hydroxyl groups of the surface, while the strong adsorption peak in the higher temperature region is due to the acid site resulting from the interaction between Cu, Zn, and Al compounds.…”

Section: Temperature-program Desorption Measurementsmentioning

confidence: 99%

Preparation and characterization of nonmetal promoter modified CuZnAl catalysts for higher alcohol from synthesis gas through complete liquid phase method

Yu¹,

Wang

Huang³

2014

Turk J Chem

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Abstract:A complete liquid phase technology and a function regulator were applied to prepare CuZnAl catalysts for higher alcohol synthesis. Characterizations showed that the introduction of the function regulator can change the reduction ability of copper oxides and the surface basicity of catalysts. Activity tests indicated that the selectivity of higher alcohol is high when considerable medium-strong basicity and the synergistic effects of copper ion and metal copper exist on the catalytic surface. The optimized modified CuZnAl catalyst without any metal additives provides a CO conversion of 28.9%, C 2+ OH selectivity of up to 42.8%, and hydrocarbon selectivity of 2.5%, with a total alcohol selectivity of 67.4% under the reaction conditions of 5.0 MPa, 250• C, H 2 /CO = 1, and a gas hourly space velocity of 360 mL/g cat h.

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Structure and catalytic performance of alumina-supported copper–cobalt catalysts for carbon monoxide hydrogenation

Cited by 201 publications

References 81 publications

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Preparation and characterization of nonmetal promoter modified CuZnAl catalysts for higher alcohol from synthesis gas through complete liquid phase method

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Structure and catalytic performance of alumina-supported copper–cobalt catalysts for carbon monoxide hydrogenation

Cited by 201 publications

References 81 publications

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H2 and O2 Atmospheres and During Reaction between CO2 and H2: In Situ X-ray Spectroscopic Characterization

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H2 and O2 Atmospheres and During Reaction between CO2 and H2: In Situ X-ray Spectroscopic Characterization

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Preparation and characterization of nonmetal promoter modified CuZnAl catalysts for higher alcohol from synthesis gas through complete liquid phase method

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Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization