title: Investigation of fine nanoparticles syngas catalyst (POM) considering their various morphology.
abstract: Ni/SiO2 fine nanoparticles were prepared by coprecipitation method using various nonionic surfactants as templates with Tylose as a binder dispersant. Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) have been used to study the templates influence on the morphology of the produced samples. Although the phase structure remained as a tetrahedron amorphous cristobalite-sin-SiO2 (101,100), rhombohedron and cubic NiO, but samples with different morphology (homogeneous nano spherical, nano rose flower and nano cubic shapes) have been achieved. These fine nanoparticles as syngas catalysts in Partial Oxidation of Methane to Hydrogen and Carbon Monoxide (POM) have been studied. Because of high Hydrogen production, it is a candidate to be a green fuel. A fixed-bed reactor at P = 1 atm, T = 800 degrees C, H2/CO = 1.8, GHSV (CH4) = 6000/hr and BET = 25, 63.5 and 87.1 m2/gr have been used as POM catalyst. From other hand these fine compounds could be converted to metallic nanotube (nanofiber) at above 850 degrees C and also bamboo shape tip mode carbon nanotube by thermal chemical vapor deposition at 800 degrees C. Transmission Electron Microscopy confirmed the metallic nanotube or single nano crystal growth. The Raman spectroscopy of all samples has been studied to confirm the different formation of Ni-Si. Choosing different templates for production of these nanoparticles could create width range of medical and industrial applications.
authors.affiliation: RIPI, Nanotechnology Research Center, Tehran 1485733111, Iran.
authors.forename: Z
authors.initials: Z
authors.lastname: Fakhroueian
authors.forename: A
authors.initials: A
authors.lastname: Shafiekhani
authors.forename: M
authors.initials: M
authors.lastname: Yousefi
authors.forename: N Afroukhteh
authors.initials: NA
authors.lastname: Langroudi
authors.forename: M
authors.initials: M
authors.lastname: Karami
authors.forename: H
authors.initials: H
authors.lastname: Varmazyar
authors.forename: M
authors.initials: M
authors.lastname: Hemmati
authors.forename: S
authors.initials: S
authors.lastname: Satari
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D005740:Gases / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction
chemical_list: D005740:Gases; D002248:Carbon Monoxide; D006859:Hydrogen; D008697:Methane