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Hexadecane

About: Hexadecane is a(n) research topic. Over the lifetime, 2009 publication(s) have been published within this topic receiving 59547 citation(s). The topic is also known as: cetane.


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Journal ArticleDOI
03 Jun 2005-Science
TL;DR: Liquid alkanes with the number of carbon atoms ranging from C7 to C15 were selectively produced from biomass-derived carbohydrates by acid-catalyzed dehydration, which was followed by aldol condensation over solid base catalysts to form large organic compounds.
Abstract: Liquid alkanes with the number of carbon atoms ranging from C7 to C15 were selectively produced from biomass-derived carbohydrates by acid-catalyzed dehydration, which was followed by aldol condensation over solid base catalysts to form large organic compounds. These molecules were then converted into alkanes by dehydration/hydrogenation over bifunctional catalysts that contained acid and metal sites in a four-phase reactor, in which the aqueous organic reactant becomes more hydrophobic and a hexadecane alkane stream removes hydrophobic species from the catalyst before they go on further to form coke. These liquid alkanes are of the appropriate molecular weight to be used as transportation fuel components, and they contain 90% of the energy of the carbohydrate and H2 feeds.

1,449 citations

Journal ArticleDOI
Abstract: Monodispere particles (in the size range 3–5 nm) at Pt, Pd, Rh and Ir have been prepared by reduction of metal salts which are dissolved in the water pools of microemulsions with hydrogen or hydrazine. The standard deviation and reproducibility of the diameter is ± 10SS. Two microemulsion systems were tested: water/cetyltrimethylammonium bromide/octanol and water/pentaethyleneglycol dodecyl ether/hexane (or hexadecane). The method to probably Generally applicable provided the following conditions are met: (1) the solubility of the salts should not be limited by specific interactions with the solvent or the surfactant, (2) the reducing agent should react only with, the salt and (3) the temperature can be adjusted so that the kinetics of the reduction are not very slow. Under properly chosen conditions the particles can be transferred to supports without agglomeration.

709 citations

Journal ArticleDOI
17 Apr 1996-Langmuir
Abstract: The electrophoretic mobility of oil droplets, dispersed without any surfactant in the aqueous phase, was measured. Four different oils were studied: xylene, dodecane, hexadecane, and perfluoromethyldecalin. Special precautions were undertaken to avoid artifacts caused by the presence of surfactant impurities. The results show that the oil droplets are negatively charged and the magnitude of their ζ-potential strongly depends on pH and the ionic strength of the aqueous phase. The electrophoretic mobility is almost independent of the type of specific nonpolar oil. Series of experiments were performed to check different hypotheses about the origin of the spontaneous charging of the oil−water interfaces. The results lead to the conclusion that hydroxyl ions, released by the dissociation−association equilibrium of the water molecules, adsorb at the oil−water interface. The specific adsorption energy was estimated to be 25kT per ion (kT is the thermal energy). The molecular origin and the implications of this ...

673 citations

Journal ArticleDOI
Abstract: In this overview we discuss how aqueous-phase catalytic processes can be used to convert biomass into hydrogen and alkanes ranging from C 1 to C 15 . Hydrogen can be produced by aqueous-phase reforming (APR) of biomass-derived oxygenated hydrocarbons at low temperatures (423–538 K) in a single reactor over supported metal catalysts. Alkanes, ranging from C 1 to C 6 can be produced by aqueous-phase dehydration/hydrogenation (APD/H). This APD/H process involves a bi-functional pathway in which sorbitol (hydrogenated glucose) is repeatedly dehydrated by a solid acid (SiO 2 –Al 2 O 3 ) or a mineral acid (HCl) catalyst and then hydrogenated on a metal catalyst (Pt or Pd). Liquid alkanes ranging from C 7 to C 15 can be produced from carbohydrates by combining the dehydration/hydrogenation process with an upstream aldol condensation step to form C–C bonds. In this case, the dehydration/hydrogenation step takes place over a bi-functional catalyst (4 wt.% Pt/SiO 2 –Al 2 O 3 ) containing acid and metal sites in a specially designed four-phase reactor employing an aqueous inlet stream containing the large water-soluble organic reactant, a hexadecane alkane sweep stream, and a H 2 inlet gas stream. The aqueous organic reactant become more hydrophobic during dehydration/hydrogenation, and the hexadecane sweep stream removes these species from the catalyst as valuable products before they go on further to form coke.

606 citations

Journal ArticleDOI
TL;DR: It is shown that the surface roughness and the strength of the fluid-surface interactions both act on wall slip, in antagonist ways, which is thought to be the first direct experimental evidence of noticeable slip at the wall.
Abstract: The boundary condition for the flow velocity of a Newtonian fluid near a solid wall has been probed experimentally with a novel setup using total internal reflection-fluorescence recovery after photobleaching leading to a resolution from the wall of the order of 80 nm. For hexadecane flowing on a hydrocarbon/lyophobic smooth surface, we give what we think to be the first direct experimental evidence of noticeable slip at the wall. We show that the surface roughness and the strength of the fluid-surface interactions both act on wall slip, in antagonist ways.

545 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202134
202040
201954
201851
201749
201654