186,213 research outputs found
Modeling Fischer Tropsch synthesis in two-phase, continuous, well-mixed slurry reactors
No full textIncludes abstract.Includes bibliographical references (p. 84-87).Fischer Tropsch Synthesis (FTS) is the conversion of syngas (CO and H2) to cleaner liquid transportation fuels. The modelling of such a supercritical, highly non-ideal, multi-component system requires the detailed knowledge of the reaction mechanism, reaction kinetics, phase-equilibrium and reactor technology. The objectives of this work were to: develop a complete Fischer Tropsch model, predict the hydrocarbon product distribution, determine what effect Vapour-Liquid Equilibrium (VLE) has on the product distribution, selectivity and kinetics, and determine whether the deviations from the 'ideal' Anderson-Schulz Flory (ASF) distribution can be attributed to VLE
Vanadia Promoted Co-AI20 3 Fischer-Tropsch Catalysts
No full textBibliography: leaves 117-124.The primary aim of this work was to study systematically V20 5 promotion on yAI203 supported cobalt-based Fischer-Tropsch catalysts. The y-Ah03 support was modified by addition of varying amounts of vanadia and was subsequently loaded with the same Co content (10 wt-%). The modified supports and catalysts were characterised using conventional characterisation methods. The physio-chemical properties of the vanadia promoted supports and catalysts were characterised using Atomic Adsorption Spectroscopy (AAS), zeta-potential measurements, and BET measurements, X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR), Transmission Electron Microscopy (TEM), and CO chemisorption. Catalyst performance in the Fischer-Tropsch synthesis was tested in fixed bed reactor. A catalysts synthesised from plain y-A1203 was used as a base catalyst. Characterization results show that modification of y-Ab03 support to obtain V205 loadings beyond 1-monolayer vanadia coverage was difficult when using ion exchange. Ion-exchange equilibrium limitations might have caused the poor vanadia loadings beyond 1-monolayer coverage. The supports net surface charge as measured using zeta potential, was decreased by vanadia content in the supports. CO chemisorption results were complex and could only be modelled using dual site Langmuir model assuming the presence of two different sites absorbing CO on the Co-V-AI catalyst system. This made extraction of physical properties from this method rather difficult. Fischer Tropsch synthesis reaction was carried out at typical industrial conditions (T=220°C, P=20 bar (a), H2/CO=2 Xco-60 mol-%) for cobalt catalysts. Vanadia promoted catalysts showed a marked decrease in initial activity. However, the overall deactivation rate was lower with increasing vanadia content. The vanadia content did not affect the chain growth kinetic behavior of the catalyst in the Fischer-Tropsch synthesis hence C5+ selectivity in the Fischer-Tropsch synthesis was unperturbed by vanadia content. Increasing the vanadia content in the catalyst resulted in high n-olefin content and high 1-olefin content. The observed increase in olefin content might be due to the low catalytic activity observed for the catalysts with high vanadia loadings. The most pronounced effect of vanadia promotion on Fischer Tropsch synthesis was in the oxygenate content in the Fischer-Tropsch product. Catalysts with high vanadia loading yielded high amounts of oxygenate products; mainly alcohols and aldehydes
W. Fischer
No full text"[SX29234]. Sig. W Fischer. Dec 1941 to Sept. 1942 Winnellee."[SX29234]. Signalman W. Fischer. December 1941 to September 1942 Winnellie
[Voluntary Statement by Ronald B. Fischer #1]
No full textVoluntary statement by Ronald B. Fischer as a witness in Dealey Plaza. He states the he was on the corner of Elm Street and Houston Street while the motorcade was coming through. He noticed a man, just before he heard gunshots, in the window on the fifth floor of the Texas School Book Depository building, who seemed to be lying down. He also noted a woman entering the Texas School Book Depository building while everyone else was exiting
A smoothing Newton method based on the generalized Fischer-Burmeister function for MCPs
No full text[[abstract]]We present a smooth approximation for the generalized Fischer-Burmeister function where the 2-norm in the FB function is relaxed to a general p-norm (p > 1), and
establish some favorable properties for it, for example, the Jacobian consistency. With the smoothing function, we transform the mixed complementarity problem (MCP) into
solving a sequence of smooth system of equations.
Opius (Cryptonastes) gracilis Fischer
No full textOpius (Cryptonastes) gracilis Fischer Opius gracilis Fischer, 1957 c: 332 –358. Opius (Cryptonastes) gracilis Fischer, 1972: 1 –620. Synonyms. Opius csikii Fischer, 1957 b; Opius minor Fischer, 1957 b; Opius nigrithorax Fischer, 1958. Distribution in Turkey. Sakarya, Bursa, Düzce, Edirne, Karabuk, Kastamonu(Fischer & Beyarslan, 2005 a), Bartin, Canakkale, Elazig, Malatya, Nevsehir (Fischer & Beyarslan, 2011); Aksaray, Erzincan, Tunceli (Fischer & Beyarslan, 2012). Distribution. Palaearctic. Austria, Bosnia Hercegovina, Bulgaria, Croatia, Czechoslovakia, Denmark, Finland, France, Germany, Hungary, Italy, Kazakhstan, Korea, Lithuania, Mongolia, Poland, Romania, Russia, Slovakia, Spain, Sweden, Switzerland, Tunisia, Turkey, United Kingdom, Uzbekistan, Yugoslavia. Hosts. Diptera. Agromyzidae: Agromyza bicophaga Hering, 1925 [Vicia tetrasperma]; A. pulla Meigen, 1830 [Genista tinctoria]; A. rondensis Strobl, 1900 [Avena sterilis, Hordeum murinum]; Amauromyza gyrans (Fallen, 1823); Chromatomyia lonicerae (Robineau-Desvoidy, 1851); C. syngenesiae Hardy, 1849 [Centaurea jacea]; Liriomyza Mik, 1894 [Centaurea jacea, Scorzonera purpurea]; L. sonchi Hendel, 1931 [Picris echioides]; L. strigata Meigen, 1830) [Pisum sativum]; L. trifolii (Burgess in Comstock, 1880) [Trifolium dubium]; Napomyza xylostei Robineau-Desvoidy, 1851; Phytomyza anemones pulsatilla Hering, 1925 [Medicago sativa]; P. dauci Hering, 1927 [Daucus]; P. ferulae Hering, 1927 [Scaligeria cretica]; P. obscura Hendel, 1920 [Clinopodium vulgare]; P. origani Hering, 1931; P. silai Hering, 1935 [Silaum silaus]; P. spondylii Robineau-Desvoidy, 1851.Published as part of Beyarslan, Ahmet & Fischer, Maximilian, 2013, Checklist of Turkish Opiinae (Hymenoptera, Braconidae), pp. 401-454 in Zootaxa 3721 (5) on page 418, DOI: 10.11646/zootaxa.3721.5.1, http://zenodo.org/record/22201
Opius (Agnopius) basirufus Fischer 1958
No full textOpius (Agnopius) basirufus Fischer, 1958 Opius basirufus Fischer, 1958 c: 241 –260. Opius (Misophthora) basirufus Fischer, 1972: 1 –620. Opius (Allotypus) basirufus Tobias 1986: 59. Opius (Agnopius) basirufus Fischer, 1982: 21 –37. Distribution in Turkey. Turkey (Fischer, 1958 a, 1997); Edirne Edirne, Icel, Kastamonu Mugla (Fischer & Beyarslan, 2005 a). Distribution. Western Palaearctic. Austria, Bulgaria, England, Finland, France, Hungary, Poland, Russia, Turkey. Hosts. Diptera. Agromyzidae: Agromyza genistae Hendel, 1931; Amauromyza (Trilobomyza) gyrans (Fallen, 1823) [Campanula trachelium]; Liriomyza centaureae Hering, 1927 [Centaurea nigra]; L. flaveola (Fallen, 1823) [Festuca gigantean]; Phytomyza affinis Fallen, 1823 [Cirsium acaulon]; P. bellidina Hendel, 1934 [Bellis sylvestris]; P. milii (Kaltenbach, 1864) [Holcus lanatus]; P. myosotis Nowakowski, 1959 [Myosotis sylvatica]; P. periclymenii de Meijere, 1924 [Lonicera periclymenium]; P. lonicerae (Robineau-Desvoidy, 1851) [Symphoricarpos rivularis].Published as part of Beyarslan, Ahmet & Fischer, Maximilian, 2013, Checklist of Turkish Opiinae (Hymenoptera, Braconidae), pp. 401-454 in Zootaxa 3721 (5) on page 412, DOI: 10.11646/zootaxa.3721.5.1, http://zenodo.org/record/22201
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