Platinum Nanoparticles on Sintered Metal Fibers Are Efficient Structured Catalysts in Partial Methane Oxidation into Synthesis Gas

Abstract

Efficient structured catalysts of partial methane oxidation into synthesis gas were obtained by electrochemical modification of the surface of sintered FeCrAl alloy fibers in an ionic liquid BMIM-NTf 2 with further introduction of platinum nanoparticles. It was shown that etching and electrochemical modification of sintered FeCrAl alloy fibers result in a decrease of the surface aluminum content. With an increase of the reaction temperature to 900 °C, the methane conversion reaches 90% and the selectivity to CO increases significantly to achieve 98%. The catalysts with a Pt loading of 1 × 10 −4 wt % demonstrate high activity and selectivity as well as TOF in synthesis gas production by the CH 4 + O 2 reaction at 850−900 °C. To trace the composition and structure evolution of the catalysts, XRD and SEM methods were used.

Electrochemical Synthesis of Unique Nanomaterials in Ionic Liquids

“…Interestingly, the addition of acetonitrile to the electrolyte leads to a decrease in the particle size from 3 nm to 1 nm. The electrodeposition of nickel, cobalt and their alloys with aluminum on the surface of Au (111) was also studied in an earlier work [89].…”

“…The distortion of the hexagonal structure is apparently caused by the shielding of the electric field due to the fibrous structure of steel. Fibers with such a surface structure were applied as substrates of effective catalysts for the partial oxidation of methane [111]. Sun et al reported the synthesis of nanoporous structures based on metals (Au, Pt, Ag) by electrodeposition of binary alloys (Au-Zn, Pt-Zn, Ag-Zn) followed by electrochemical removal of one of the alloy components, i.e., zinc (dealloying), using a mixture of zinc chloride and EMIMCl [112][113][114].…”

“…Titanium nanowires were obtained by electrodeposition from TiCl 4 in BMIM-NTf 2 on Au (111), while the formation of titanium nanoparticles with a size of 1-2 nm and Ti-Au alloy particles was noted [119,120].…”

The Microstructure Formation of a Protective Oxide-Scale Layer on Small-Diameter FeCrAl Fibers

“…Various experimental studies have investigated the effects of rare earth elements on oxidation behavior [ 23 , 24 , 25 , 26 , 27 , 28 ]. However, the literature survey reveals few technical papers on FeCrAl fibers [ 17 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. Li et al [ 31 ] and Fornasiero et al [ 32 ] investigated FeCrAl fibers as a substrate and support of catalysts.…”