Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 5 Articles
CO2 hydrogenation reaction was performed on precipitated iron catalysts which were\npromoted by Si, Zn, K and Cu. The optimum SiO2 content in the catalysts is about 15\nwt% relative to Fe2O3 mass. With reaction temperature raised, CO2 conversion is increased\ncontinually, but CO and CH4 selectivity only fluctuate in a narrow range\nwhich is beneficial to the synthesis of C2+ hydrocarbons. Two kinds of catalyst filling\nconstitution were experimentally compared in order to increase the yield of C5+ hydrocarbons....
The removal of Pb(II) fromwater by biosorption processes onto malt bagasse was investigated and the kinetic and thermodynamic\nparameters were obtained; additionally a diffusion modeling was proposed. The characterization of malt bagasse was performed\nby FTIR and SEM/EDS. The experiments were conducted in batch system and an experimental design based response surface\nmethodology was applied for agitation speed and pH optimization. The kinetics of biosorption followed pseudo-second-order\nmodel and the temperature of the process affected the biosorption capacity. Isotherm models of Langmuir, Freundlich, and Elovich\nwere applied and the Langmuir model showed better fit and the estimated biosorption capacity was 29.1mg gâË?â??1.The negative values\nobtained for Ã?â?...
The chemical oxidative polymerization of 2-aminothiazole (AT) was studied in aqueous\nsolution using copper chloride (CuCl2) as an oxidant. The effect of varying the reaction temperature,\nreaction time and oxidant/monomer molar ratio on the polymer yield was investigated. The resulting\npoly(2-aminothiazole)s (PATs) were characterized by FTIR, 1H NMR, UV-vis, gel permeation\nchromatography, scanning electron microscopy, thermogravimetric analysis and four-point probe\nelectrical conductivity measurements. Compared with a previous study, PATs with higher yield\n(81%) and better thermal stability could be synthesized. The chemical oxidative polymerization\nkinetics of AT were studied for the first time. The orders of the polymerization reaction with respect\nto monomer concentration and oxidant concentration were found to be 1.14 and 0.97, respectively,\nand the apparent activation energy of the polymerization reaction was determined to be 21.57 kJ/mol....
The ability of some nanostructured materials to perform as effective heterogeneous\ncatalysts is potentially hindered by the failure of the liquid reactant to effectively wet\nthe solid catalyst surface. In this work, two different chemical reactions, each involving\na change of phase from liquid to gas on a solid catalyst surface, are investigated.\nThe first reaction is the catalyzed decomposition of a H2O2 monopropellant within a\nmicro-chemical reactor chamber, decorated with RuO2 nanorods (NRs). The second\nreaction involves the electrolysis of dilute aqueous solutions of H2SO4 performed\nwith the cathode electrode coated with different densities and sizes of RuO2 NRs. In\nthe catalyzed H2O2 decomposition, the reaction rate is observed to decrease with increasing\ncatalyst surface density because of a failure of the liquid to wet on the catalyst\nsurface. In the electrolysis experiment, however, the reaction rate increased in\nproportion to the surface density of RuO2 NRs. In this case, the electrical bias applied\nto drive the electrolysis reaction also causes an electrostatic force of attraction between\nthe fluid and the NR coated surface, and thus assures effective wetting....
This research presents an automated method of synthesizing semiconductor and metal\nnanoparticles using flow rector synthesis as a new alternative to the batch method of synthesizing\nnanoparticles. Experiments were carried out to determining the optimal flow rates of reagents\ndroplets. The reactor was successfully applied to the synthesis of colloidal solutions of\nsemiconductor (CdSe) and metal (Ag) nanoparticles. This instrument is applicable both in\nmaterial science laboratories and in industry....
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