Mössbauer study of hydrogen reduction in Fe and FeNi on silica supported catalysts prepared by evaporation

Lin, Xinrui; Jiang, Jianzhong

doi:10.1002/pssa.2211380141

Cited by 1 publication

(1 citation statement)

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“…In general, supported iron nanoparticles are prepared by deposition of an iron salt on a hydrophilic support material, such as silica or alumina. Upon calcination iron oxide nanoparticles are formed which are usually stepwise reduced using an external H2(g) source [30]; the following reduction steps can be observed: Fe2O3  Fe3O4  FeO  Fe (0) . However, it is known that the presence of water vapor will strongly affect the rate of reduction and may even prevent the reduction of iron oxides thermodynamically [30][31][32][33].…”

Section: Thermodynamic Considerationsmentioning

confidence: 99%

The effect of iron catalyzed graphitization on the textural properties of carbonized cellulose: Magnetically separable graphitic carbon bodies for catalysis and remediation

Hoekstra

Beale

Soulimani

et al. 2016

Carbon

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Whereas pyrolysis of pristine microcrystalline cellulose spheres yields nonporous amorphous carbon bodies, pyrolysis of microcrystalline cellulose spheres loaded with iron salts leads to the formation of magnetically separable mesoporous graphitic carbon bodies. The microcrystalline cellulose spheres loaded with either iron(III) nitrate, ammonium iron(III) citrate or iron(III) chloride were pyrolyzed up to 800 °C. Temperature dependent X-ray diffraction analysis shows that the iron salts are transformed into iron oxide nanoparticles; their size and distribution are influenced by the anion of the iron salt. The iron oxide nanoparticles are subsequently carbothermally reduced by the amorphous carbon that is obtained from the pyrolysis of the microcrystalline cellulose. Next, the iron nanoparticles catalyze the conversion of the amorphous carbon to graphitic carbon nanostructures as shown with XRD, electron microscopy and Raman spectroscopy. The extent of graphitization depends on the iron nanoparticle size. Nitrogen physisorption measurements show that this graphitization process introduces mesopores into the carbon bodies. The benefits of the properties of the resulting carbon bodies (ferromagnetic character, graphitic content, mesoporosity) are discussed in connection with applications in liquidphase catalysis and remediation.

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