Catalytic synthesis of carbon nanotubes over ordered mesoporous matrices

Abstract

Pyrolytic decomposition of acetylene over the surface of nickel-, cobalt- and iron-containing ordered mesoporous MCM-41 silicas has been studied. Catalytically active matrices have been prepared by chemisorption of volatile metal acetylacetonate complexes on the silica surface. Reduction of the supported metal-containing compounds was carried out in hydrogen or acetylene atmosphere. Acetylene is used not only as a source of carbon in synthesis of the nanostructures but also as a reagent capable of reducing metal ions in the surface chemical compounds. Formation of carbon nanotubes and nanofibers is shown to depend on the pyrolysis conditions

trans-Dimethanolbis(1,1,1-trifluoro-5,5-dimethylhexane-2,4-dionato)zinc(II)

“…For mass spectrometry related articles see Lerach & Leskiw (2008) and Schildcrout (1976). For a variety of applications and properties of metal -diketonate complexes refer to Burtoloso (2005), Katok et al (2006) and Condorelli et al (2007). Lerach et al (2007) report the structure of the Co analogue of the title compound.…”

“…β-Diketonates and especially metal β-diketonate complexes have been widely studied for both their instrinsic properties as well as a variety of scientific and technolgical applications. Especially interesting applications include, but are not limited to, catalysis (Burtoloso, 2005), carbon-nanotube structures (Katok et al, 2006), or the deposition of metallic or ceramic thin films (Condorelli et al, 2007). In our own laboratory we are investigating gas phase reactions of a series of metal acetylacetonate (acac) complexes.…”

trans-Dimethanolbis(1,1,1-trifluoro-5,5-dimethylhexane-2,4-dionato)cobalt(II)

“…For similar metal-acetylacetonates refer to Bullen (1959) and Werndrup & Kessler (2001). Varying uses of metal--diketonates can be found in Mayo et al (2000), Katok et al (2006), Bessergenev (2004) and Fahlmen (2006). The paper by Bernstein et al (1995) describes graph-set motifs.…”

“…areas including catalysis in sol-gel synthesis (Mayo et al, 2000), carbon nanotube formation (Katok et al, 2006) and also as precursors for metal organic chemical vapor deposition (MOCVD) (Bessergenev, 2004). The synthesis of metal-βdiketonates has also been studied thoroughly (Skopenko et al, 2004).…”

Enhanced optical and antimicrobial activities of mono Zn and bimetallic (Zn, Co), (Zn, Pd) ions modified MCM-41: structural and morphological investigation

“…The most crucial contenders for MCM-41 dopants include the third main group as well as certain trivalent transition metal. [2,[20][21][22][23]. Furthermore, the incorporation of M 2+ and M 4+ into the structure of mesoporous silica has been investigated.…”