Methanol selectivity of silica-supported PtFe

Woo, Hee-Chul; Fleisch, T. H.; Foley, Henry C.; Uchiyama, S.; Delgass, W. Nicholas

doi:10.1007/bf00764875

Cited by 24 publications

(12 citation statements)

References 18 publications

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“…The models can be divided in two types, which assume either full reduction of the metal (6), or the presence of an iron oxide phase in addition to an alloy (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22); incidentally, unalloyed metals may be present as has been observed in FePd/SiO 2 (17,18).…”

Section: Discussionmentioning

confidence: 99%

Structure and Reactivity of Bimetallic FeIr/SiO2 Catalysts after Reduction and during High-Pressure CO Hydrogenation

Gruijthuijsen

Howsmon

Delgass

et al. 1997

Journal of Catalysis

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Bimetallic FeIr/SiO 2 CO hydrogenation catalysts have been studied by temperature-programmed reduction, EXAFS, Mössbauer spectroscopy, and previously also by infrared spectroscopy of adsorbed CO. We concentrate on the structure of a freshly reduced sample, which is selective for the formation of hydrocarbons from CO + 3H 2 , and a catalyst activated during 48 h of reaction, which produces mainly methanol. The fresh sample contains iron oxide and bimetallic FeIr particles with an iron-rich surface after reduction in H 2 at 450 • C. During CO hydrogenation, a part of the oxidic iron reduces and forms, together with some of the iron that is initially alloyed an iron carbide. CO adsorption on activated FeIr/SiO 2 is considerably weaker than on the freshly reduced catalyst, while the activated catalyst also possesses a much higher hydrogenation activity than the initially reduced system does. Structure models for the catalyst after reduction and during steady state CO hydrogenation at high pressure are discussed.

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Section: Discussionmentioning

confidence: 99%

Structure and Reactivity of Bimetallic FeIr/SiO2 Catalysts after Reduction and during High-Pressure CO Hydrogenation

Gruijthuijsen

Howsmon

Delgass

et al. 1997

Journal of Catalysis

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“…In the Cu-rich Fe(20)-Cu(80) catalyst, Cu exists almost completely in the FCC phase with a coordination number of 10.5. It may be recalled that the monometallic Cu(20)/SiO2 catalyst shows complete reduction to the Cu metal with a coordination number of 11. FTs of the Fe K-EXAFS (Figure 13b) show Fe to exist mainly in the silicate phase up to 60%; the metallic phase is mainly in the BCC structure.…”

Section: Resultsmentioning

confidence: 97%

“…In the presence of even a small proportion of Ni as in the Fe(75)-Ni( 25) catalyst, the formation of a BCC FeNi alloy is favored, part of which is superparamagnetic and part is ferromagnetic (Figures 9 and 10). Of the different compositions of the bimetallic catalyst, Fe(50)-Ni(50) alone shows a predominantly ferromagnetic FeNi alloy, present mostly in the FCC structure, independent of whether the precursor is only dried at 350 K or calcined at 723 K (Figures [9][10][11]. On either side of this composition, a superparamagnetic alloy is formed, to a much greater extent in the Fe(25)-Ni(75) catalyst.…”

Section: Resultsmentioning

confidence: 99%

In-situ Moessbauer and EXAFS investigations of the structural and magnetic properties of bimetallic iron-nickel/silica and iron-copper/silica catalysts

Rao¹,

Kannan²,

Chaturvedi³

1992

J. Phys. Chem.

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“…Among diverse bimetallic catalysts developed so far, the Fe-Ru catalysts are the representative alloy system successfully used in the Fischer-Tropsch synthesis [ 5 ]. The Fe-Pt catalysts have been known since their methanol activity and selectivity would be changed by the varied proportion in the alloy phase [ 6 ]. In addition, the increase of Fe content in zeolite-supported Pd catalysts has been known that it could increase the rate of methanol formation [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Bimetallic Fe-Ru Oxide Nanoparticles Prepared by Liquid-Phase Plasma Method

Lee

Jeon

et al. 2016

Nanoscale Res Lett

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The bimetallic Fe-Ru oxide nanoparticles were synthesized in the liquid-phase plasma (LPP) method which employed iron chloride and ruthenium chloride as precursors. The active species (OH·, Hα, Hβ, and OI) and the iron and ruthenium ions were observed in the plasma field created by the LPP process. The spherical-shaped bimetallic Fe-Ru oxide nanoparticles were synthesized by the LPP reaction, and the size of the particles was growing along with the progression of the LPP reaction. The synthesized bimetallic Fe-Ru oxide nanoparticles were comprised of Fe2O3, Fe3O4, RuO, and RuO2. Ruthenium had a higher reduction potential than iron and resulted in higher ruthenium composition in the synthesized bimetallic nanoparticles. The control of the molar ratio of the precursors in the reactant solution was found to be employed as a means to control the composition of the elements in bimetallic nanoparticles.

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Methanol selectivity of silica-supported PtFe

Cited by 24 publications

References 18 publications

Structure and Reactivity of Bimetallic FeIr/SiO2 Catalysts after Reduction and during High-Pressure CO Hydrogenation

Structure and Reactivity of Bimetallic FeIr/SiO2 Catalysts after Reduction and during High-Pressure CO Hydrogenation

In-situ Moessbauer and EXAFS investigations of the structural and magnetic properties of bimetallic iron-nickel/silica and iron-copper/silica catalysts

Characterization of Bimetallic Fe-Ru Oxide Nanoparticles Prepared by Liquid-Phase Plasma Method

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