Study of Pt-Promoted Cobalt CO Hydrogenation Catalysts

Schanke, Dag; Vada, S.; Blekkan, Edd A.; Hilmen, Anne-Mette; Hoff, A.; Holmén, Anders

doi:10.1006/jcat.1995.1234

Cited by 444 publications

(185 citation statements)

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“…The SI of second order interactions, S PtCo , S PtFe and S CoFe , are listed in Table 4. The Pt-Co interaction in Pt-Co-Fe/CNT catalysts showed significant impact on CALD conversion, a phenomenon that was reported in Pt-Co bimetallic catalysts (Lu et al, 1992;Schanke et al, 1995). The Pt-Fe interaction improves reaction selectivity significantly, similar to the reported studies on Pt-Fe catalysts (Beccat et al, 1990;Fukuoka et al, 1990;12 Crabb and Marshall, 2001).…”

Section: Sensitivity Analysissupporting

confidence: 79%

Model-aided optimization and analysis of multi-component catalysts: Application to selective hydrogenation of cinnamaldehyde

Yan

Guo

Jia

et al. 2012

Chemical Engineering Science

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Section: Sensitivity Analysissupporting

confidence: 79%

Model-aided optimization and analysis of multi-component catalysts: Application to selective hydrogenation of cinnamaldehyde

Yan

Guo

Jia

et al. 2012

Chemical Engineering Science

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“…9 Besides the key electrocatalytic role of the Pt catalysts in fuel cells, they have long been used as a promoter in the Fischer-Tropsch (FT) synthesis for conversion of syngas (CO + H 2 ) to liquid fuels. [13][14][15] The Pt promoters increase the overall FT activity by increasing the reducibility of cobalt oxides, and therefore increases the availability of active metal sites. 13,14 Interfaces between transition metals (TM) and graphene have been investigated extensively by several theoretical and experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15] The Pt promoters increase the overall FT activity by increasing the reducibility of cobalt oxides, and therefore increases the availability of active metal sites. 13,14 Interfaces between transition metals (TM) and graphene have been investigated extensively by several theoretical and experimental techniques. [16][17][18][19][20][21][22] Müller et al investigated a single Pt atom, Pt dimers and trimers on highly oriented pyrolytic graphite using a scanning tunneling microscope (STM) in air.…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon Support on Electronic Structure and Catalytic Activity of Pt Catalysts: Binding to the CO Molecule

2016

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Single-atom catalysts, especially with single Pt atoms, exhibit potentially improved catalytic activity as compared to metal clusters and metal surfaces. Here, the atop and bridged bondings of the CO molecule on the Pt/C system are studied. Vibrational frequencies, Mulliken populations, charge transfer, charge density differences and density of states are examined to determine the influence of the carbon support on electronic properties and catalytic activity of the Pt adatom and dimer. Comparing orbital populations and the amount of electron transfer to/from the CO molecule show that the net amount of electron transfer to the anti-bonding 2π * orbitals of the CO molecule is higher for the supported Pt dimer than for the substrate-free Pt dimer which leads to a lower vibrational frequency and a larger C−O bond distance. The hybridization between the π orbitals of the polycyclic aromatic hydrocarbons surface and the d orbitals of the Pt adatoms is responsible for enhancing the back donation of electrons to the 2π * orbitals of the CO molecule which results in a larger peak below the Fermi level for the 2π * states of the CO molecule in the corresponding density of state analysis. Therefore, it can be concluded that the carbon support significantly enhances the catalytic activity of the Pt atoms in contact with the surface for activating the CO molecule. The calculated C−O vibrational stretching frequencies provide valuable guidance for experiments considering the use of atom-type catalyst as building blocks for designing new catalysts.

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“…Besides the support, the addition of noble metals to a supported cobalt catalyst can also change the cobalt state and modify its activity and selectivity , Kapoor et al 1992, Niemantsverdriet et al 1988, Schanke et al 1995. Generally, it has been proposed that the addition of a noble metal promotes cobalt oxide reduction (Idriss et al 1992, Juszczyk et al 1993, Kapoor et al 1992, Martens et al 1986, Sarkany et al 1995, Schanke et al 1995.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, it has been proposed that the addition of a noble metal promotes cobalt oxide reduction (Idriss et al 1992, Juszczyk et al 1993, Kapoor et al 1992, Martens et al 1986, Sarkany et al 1995, Schanke et al 1995.…”

Section: Introductionmentioning

confidence: 99%

Towards an atomic level understanding of niobia based catalysts and catalysis by combining the science of catalysis with surface science

Schmal¹,

Freund

2009

An. Acad. Bras. Ciênc.

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The science of catalysis and surface science have developed, independently, key information for understanding catalytic processes. One might argue: is there anything fundamental to be discovered through the interplay between catalysis and surface science?Real catalysts of monometallic and bimetallic Co/Nb 2 O 5 and Pd-Co/Nb 2 O 5 catalysts showed interesting selectivity results on the Fischer-Tropsch synthesis (Noronha et al. 1996, Rosenir et al. 1993. The presence of a noble metal increased the C + 5 selectivity and decreased the methane formation depending of the reduction temperature. Model catalyst of Co-Pd supported on niobia and alumina were prepared and characterized at the atomic level, thus forming the basis for a comparison with "real" support materials. Growth, morphology and structure of both pure metal and alloy particles were studied. It is possible to support the strong metal support interaction suggested by studies on real catalysts via the investigation of model systems for niobia in comparison to alumina support in which this effect does not occur. Formation of Co 2+ penetration into the niobia lattice was suggested on the basis of powder studies and can be fully supported on the basis of model studies. It is shown for both real catalysts and model systems that oxidation state of Co plays a key role in controlling the reactivity in Fischer-Tropsch reactions systems and that the addition of Pd is a determining factor for the stability of the catalyst. It is demonstrated that the interaction with unsaturated hydrocarbons depends strongly on the state of oxidation.

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Study of Pt-Promoted Cobalt CO Hydrogenation Catalysts

Cited by 444 publications

References 0 publications

Model-aided optimization and analysis of multi-component catalysts: Application to selective hydrogenation of cinnamaldehyde

Model-aided optimization and analysis of multi-component catalysts: Application to selective hydrogenation of cinnamaldehyde

Influence of Carbon Support on Electronic Structure and Catalytic Activity of Pt Catalysts: Binding to the CO Molecule

Towards an atomic level understanding of niobia based catalysts and catalysis by combining the science of catalysis with surface science

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