Decomposition of CO−H₂ over Graphite Nanofiber-Supported Iron and Iron−Copper Catalysts

Abstract

We investigated the effect on the catalytic behavior of iron and iron-copper induced by supporting the particles on "platelet" graphite nanofibers. The decomposition of CO/H 2 was selected as a probe reaction to ascertain the manner by which this unique type of support medium influences the activity and selectivity of the metal catalysts. For comparison purposes a corresponding set of experiments was carried out where the metal and bimetallic particles were dispersed on silica, a traditional support material. It was found that the overall performance of the graphite nanofiber-supported metal catalysts was superior to that of the corresponding silica-supported systems. Furthermore, it was significant to find that the structures of the solid carbon products were entirely different from those produced by the respective unsupported metal catalyst systems. These modifications in the behavior of the iron-containing particles are discussed in terms of the impact of a metalsupport interaction.

Bimetal CuFe Nanoparticles—Synthesis, Properties, and Applications

“…FeCu nanoparticles have also been produced by chemical reduction [40][41][42][43][44][45][46][47]. FeCu nanoparticles were synthesized from chemical reduction of Cu and Fe dodecyl sulfate (Fe(DS) 2 and Cu(DS) 2 ) by sodium borohydride (NaBH 4 ) and their magnetic properties were studied by Duxin et al [40].…”

“…FeCu nanoparticles of various composition (Fe:Cu = 8:2, 5:5, 2:8) prepared by the reduction of iron and copper nitrates were dispersed on the two various media, highly ordered "platelet" graphite nanofibers GNF and amorphous silica [46]. Size of nanoparticles supported on "platelet" GNF is equal 13.1nm, 11.1 nm, 12.7 nm for Fe:Cu = 8:2, 5:5, 2:8, respectively and is twice as large on average as those supported in silica equal to 5.6 nm, 7.6 nm, 8.1 nm for Fe:Cu = 8:2, 5:5, 2:8, respectively.…”

Preparation and Magnetic Properties of Carbon Encapsulated Fe-Cu Alloy Nanoparticles

“…During the past decades, the Fe-Cu alloys, a kind of nonequilibrium metastable system [1], have attracted a great deal of attention because of their unique characteristics for producing ductile materials in intermetallic compounds and that allows development of high-strain-state super-plastics [2,3]. The granular Fe-Cu alloys in nanoscale have exhibited peculiar physical and chemical properties, such as ultra-soft magnetism, widely catalytic activity, high conductivity and giant magnetoresistive (GMR) behavior [4][5][6][7][8][9]. However the oxidation and agglomeration have restricted the application of the metastable alloys nanoparticles.…”