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Showing 1 to 20 of 144 for “"Calcination"”.
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Evolution of kaolinite morphology upon calcination and dissolution
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Effect of calcination temperature on bilayer TiO2/ZnO and ZnO/TiO2 thin films
… speed of 3000 rpm and were calcined at different calcination temperatures that are 400 oC, 500 oC, and 600 oC. The X-ray diffraction (XRD) technique revealed that hisghest anatase crystalline phase for TiO2 growth with orientation (1 0 1), while the ZnO crystal phase, zincite occurred at the …
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Flash calcination of limestone in a bench-scale sorbent activation process (SAP) unit
… States. Additionally, kinetic information about calcination of the two limestone samples was obtained from the analysis of non-isothermal decomposition measured by thermogravimetric analysis (TGA) method. Furthermore, the kinetic information was used to predict limestone calcination in SAP. Lime …
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Solar receiver coating development: the synthesis and growth of copper chromite spinel particles across sol-gel routes and calcination profiles
CuCr2O4 is a promising spectrally selective material for solar receiver coatings to improve solar efficiency. Key requirements of such a coating are its high absorptivity, robustness, and ability to prevent high temperature oxidation of the substrate. This work describes synthesis routes for the …
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Incorporation of Platinum onto Zeolite KL for aromatisation reactions
… conditions in order to see the effect of calcination temperature, calcination medium, and calcination time on the dispersion of the platinum. After obtaining the optimum calcination conditions, a set of samples were then prepared under these calcination conditions and used to investigate …
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Nickel aluminide coating as catalyst in steam methane reforming microreactor
… withdrawal speed has been conducted. Analysis of calcination temperatures on nickel aluminide thin film, followed by characterization of nickel aluminide thin film, then tested with SMR yield were performed. The studied parameters used DC withdrawals speed of 40, 80, 120, 160 and 200 mm/min. Next, …
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Partial oxidation of α-olefins over iron antimony oxide catalysts
… the influence of catalyst parameters such as calcination temperature, Sb:Fe ratio, type of pre-treatment, absence or presence of gaseous oxygen on the activity and selectivity in the partial oxidation of propene. Furthermore the influence of the reaction parameters temperature, space time, …
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Preparation and characterization of natural hydroxyapatite from tilapia bones and scales for biomedical applications
… bones and scales were successfully extracted by calcination technique in neutral atmosphere. In order to produce HA with close composition to human bone, the calcination parameters such as temperatures, holding time and heating rate were manipulated. Results obtained indicated that treatment at …
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Synthese von Pulvern aus dem System CaO-SiO2 mittels nasschemischer Verfahren und Entwicklung eines Werkstoffes unter dem Aspekt einer Applikation in der Dentalmedizin
… Alternative zur herkömmlichen Synthese mittels Calcination von CaCO3- und SiO2-Pulver (Festkörperdiffusion) angewandt werden können, und zum zweiten die Weiterentwicklung eines auf Tricalciumsilicat basierenden Werkstoffes unter dem Aspekt seiner Anwendung als dentales Füllungsmaterial. <br>Die …
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Preparation of high purity doped oxides for fundamental studies
… size was observed to increase with increasing calcination temperature and a correlation between the particle size and formation of NiO was noted. In particular, NiO is absent as a second phase in the finer particle size material (lower calcination temperatures) but present in coarser material …
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Optimization of Struvite Recovery Utilizing Magnesium Oxide
… process. MgO is produced from magnesite (MgCO3) calcination, and different calcination conditions can alter the quality and characteristics of the MgO product. It was hypothesized that the insolubility of MgO could provide a "slowly available" form of Mg2+ in the reactor and consequently allow …
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Combined Hydrogen and Oxygen transport membranes in the activation of Methane
… understand the process and attempt to reduce the calcination temperature. Results from the calcination tests proved that the use of a microwave furnace can reduce the calcination time and temperature for BCY20, from 1200OC for 12h in a conventional furnace, to 1000OC for 1h, thereby saving time …
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Decomposition of Cr(OH)₃ to form active Cr₂C₃
… sinterability of Cr₂C₃ powders produced by the calcination of a Cr(OH)₃ gel. The decomposition of the gel was investigated by thermogravimetric analysis, X-ray analysis and microscopic examination. Comparison was made between the size of crystallites as determined by X-ray line broadening and …
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Correlative ex-situ analysis and operando ellipsometric investigation during oxygen evolution reaction of mesoporous iridium oxide model catalysts
… a model for ellipsometric fit studies of a calcination series of mesoporous iridium oxide films (300 °C – 600 °C) was developed and validated in terms of film thickness and porosity as well as electrical and electronic properties using various ex-situ characterization methods such as …
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ZSM-5/thermoplastic polyurethane mixed matrix membranes for pervaporation of dilute aqueous organic solvents
… permeability of the MMMs. Ball milling and air calcination were also conducted on the ZSM-5 particles to ideally further improve their separation capabilities. The resulting membranes were characterized by SEM, AFM, EDXA, TGA, and contact angle analysis. Experimental results indicated that the …
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Phosphate and thermal stabilization of heavy metals in dredged sediments
… manganese oxides (18%). Phosphate addition and calcination resulted in sparingly soluble phases, hopeite (Zn_3(PO_4)_2.4H_2O) (22%), and spinels, gahnite (ZnAl_2O_4) (44%) and franklinite (ZnFe_2O_4) (34%). Sequential extraction revealed similar shifts in metal forms from labile to recalcitrant …
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Synthesis, Processing And Characterization Of Nanocrystalline Titanium Dioxide
… time, TiO2 nanopowder was obtained after calcination at 400oC. The powder was analyzed for its phases using X-ray powder diffraction (XRD) technique. Crystallite size, powder morphology and lattice fringes were determined using high-resolution transmission electron microscopy (HR-TEM). …
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Correlations between the Mineralogy and Recovery Behavior of Rare Earth Elements (REEs) in Coal Waste
… in recent years, and it was found that after calcination at 600 ℃ for 2 h, a significant improvement in REE recovery can be achieved. In order to reveal the mechanisms of the enhanced REE recovery after calcination, coal waste samples from two different seams, i.e., Western Kentucky No. 13 and …
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Sugarcane green ceramic hollow fibre membrane for oily wastewater separation
… The first step in the production of WSBA was the calcination process of sugarcane bagasse at 800 °C followed by characterization of the microstructure, phases present, and thermal behavior using transmission electron microscopy (TEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), …
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Kraft lignin as a fuel for the rotary lime kiln
… temperature, solid bed temperature and percent calcination as a function of the percentage of natural gas replaced by lignin. Gas and solids bed temperatures and percent calcination were found to be slightly higher at a given axial position in the kiln when burning lignin as compared to natural …
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