No abstract

Carbon nanosheet fi lms were deposited on Al substrates by using plasma assisted chemical vapor deposition (PACVD) technique. And after being peeled off from Al substrates, carbon nanosheet powders (CNSPs) were obtained. In Raman spectrum of carbon fi lm, there was a strong and broadened peak at about 1,580 cm -1 , indicating a carbon diamond-like fi lm. Atomic force microscope image showed that the carbon diamond-like fi lm had a grain size less than 100 nm, and its surface roughness Ra was 17.95 nm in an area of 5×5 m 2 . The CNSPs were irregular sheets with curly edges and a length of several micrometers to several hundreds of micrometers. The BET surface area of CNSPs was 6.66 m 2 /g with no micro-pore present, which was confi rmed by N 2 adsorption-desorption characterization. In the adsorption testing, when the relative pressure p/p 0 was higher than 0.3, the adsorption behavior did not follow the Langmuir equation. The addition of CNSPs to carbon black (catalyst support) could improve hydrodesulfurization performance of carbon supported Ni-W catalysts for diesel oil.

By peeling off the carbon film from substrate, carbon nano sheet powders (CNSP) were prepared. The carbon film was fabricated by high energy plasma enhanced chemical vapor deposition method. AFM showed that, its grain size is less than 100 nm, surface roughness Ra is 17.95 nm in a range of 5×5μm of this film. Raman spectra discovered that there is strong and broadened dispersion peak only about 1580 cm -1 in this film. The shapes of CNSP are various irregular sheets, the smallest sheet is less than 10μm, the largest sheet is larger than 500μm in length, and the sheet is frizzy in width when it is long enough. The BET surface area is 6.66 m 2 /g and there are no any pore tested by N 2 adsorption-desorption isotherms. Isotherm adsorption testing showed that even, when the relative pressure P/P 0 larger than 0.3, the adsorption volume is decreased instead. After active elements of Mo and W were carried, the CNSP based catalysts showed super desulfurizing performance of 459.9 ppm/g or 69.01 ppm/m 2 from diesel oil hydrogenation.