Sorption kinetics of strontium in porous hydrous ferric oxide aggregates II. Comparison of experimental results and model predictions

2005 ◽  
Vol 283 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Annette Hofmann ◽  
Wendy van Beinum ◽  
Johannes C.L. Meeussen ◽  
Ruben Kretzschmar
Keyword(s):  
Ferric Oxide ◽  
Sorption Kinetics ◽  
Experimental Results ◽  
Hydrous Ferric Oxide ◽  
Model Predictions ◽  
Kinetics Of

Sorption kinetics of strontium in porous hydrous ferric oxide aggregates

2005 ◽  
Vol 283 (1) ◽  
pp. 18-28 ◽  
Author(s):  
Wendy van Beinum ◽  
Annette Hofmann ◽  
Johannes C.L. Meeussen ◽  
Ruben Kretzschmar
Keyword(s):  
Ferric Oxide ◽  
Sorption Kinetics ◽  
Hydrous Ferric Oxide ◽  
Kinetics Of

scholarly journals Effect of Additives on the Sorption Kinetics of a Silica Gel Bed in Adsorption Chiller

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1083
Author(s):  
Karol Sztekler ◽  
Wojciech Kalawa ◽  
Łukasz Mika ◽  
Agata Mlonka-Medrala ◽  
Marcin Sowa ◽  
...  
Keyword(s):  
Silica Gel ◽  
Adsorbed Water ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Experimental Results ◽  
Process Time ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Adsorption Chiller ◽  
Kinetics Of

The article presents experimental results of the metal-based and carbon nanotube additives influence on sorption kinetics of a silica-gel-based adsorption bed in an adsorption chiller. The purpose of the doping is to improve the efficiency of sorption processes within the bed by use of metallic and non-metallic additives characterized by higher thermal diffusivity than basic adsorption material. The higher the thermal conductivity of the bed, the faster the sorption processes take place, which directly translates into greater efficiency of the refrigerator. In this study, sorption kinetics of pure silica gel sorbent doped with a given amount of aluminum (Al) and copper (Cu) powders and carbon nanotubes (CNT) were analyzed. The tests were performed on DVS Dynamic Gravimetric Vapor Sorption System apparatus used for dynamic vapor sorption measurements. A decrease in the amount of adsorbed water was observed with an increase in the mass share of the additives in the performed studies. Experimental results show that, CNTs seems to be the most promising additive as the sorption process time was reduced with the smallest decrease in water uptake. Any significant reduction of adsorption time was noted in case of the Al addition. Whereas, in case of Cu doping, delamination of the mixture was observed.

Development of an Activity Based Kinetic Model for an Esterification Process with Indion 180 Catalyst

2019 ◽  
Vol 17 (9) ◽  
Author(s):  
Mekala Mallaiah ◽  
Chimmiri Venkateswarlu
Keyword(s):  
Kinetic Model ◽  
Reaction Rate ◽  
Experimental Results ◽  
Catalyst Loading ◽  
Esterification Reaction ◽  
Order Kinetic ◽  
Kinetic Rate ◽  
Model Predictions ◽  
Effects Of Temperature ◽  
Kinetics Of

Abstract The kinetics of esterification reaction between acetic acid and methanol was studied with the Indion 180 catalyst in the temperature range between 323.15 and 353.15K, and the catalyst loading between 0.01 g/cc to0.05 g/cc. The effects of temperature, catalyst loading, size of the catalyst and agitation speed on the reaction rate were investigated. The experimental results have shown the negligible effect of mass transfer resistances on the reaction rate. A second order kinetic rate expression was used to correlate the experimental data. An activity based kinetic model was also developed for the esterification process, which was validated against experimental results. The activity based model is found advantageous as it involves only two reaction rate parameters which were determined based on the kinetic rate parameters of the concentration based model. The comparison of the model predictions with the experimental results for different temperature and catalyst loading conditions has shown the better suitability of the activity based kinetic model for the esterification process with Indion 180 catalyst.

scholarly journals The release of iron from horse spleen ferritin to 1,10-phenanthroline

1974 ◽  
Vol 137 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Terence G. Hoy ◽  
Pauline M. Harrison ◽  
Mohammad Shabbir ◽  
Ian G. Macara
Keyword(s):  
Ferric Oxide ◽  
Protein Concentration ◽  
Experimental Results ◽  
Hydrous Ferric Oxide ◽  
Hypothetical Model ◽  
Surface Areas ◽  
Horse Spleen Ferritin ◽  
Micelle Surface

The rate of release of iron to 1,10-phenanthroline from ferritin fractions of different iron contents has been studied. The experimental results could be interpreted by a simple hypothetical model of the shape of the hydrous ferric oxide micelle at different iron contents, and reasonable correlation obtained between the rate of release and the calculated micelle surface areas. Initial rates of release did not correlate significantly with protein concentration.

scholarly journals Uptake and release of ferritin iron. Surface effects and exchange within the crystalline core

1974 ◽  
Vol 139 (3) ◽  
pp. 603-607 ◽  
Author(s):  
Terence G. Hoy ◽  
Pauline M. Harrison ◽  
Mohammad Shabbir
Keyword(s):  
Surface Area ◽  
Ferric Oxide ◽  
Model System ◽  
Experimental Results ◽  
Iron Surface ◽  
Hydrous Ferric Oxide ◽  
Crystalline Core ◽  
Ferritin Iron ◽  
Cation Sites ◽  
Uptake And Release

The uptake and subsequent release of iron by apoferritin and ferritin was studied by using labelled iron (59Fe). The experimental results are consistent with predictions arising from a model system developed in the interpretation of previous experiments. In this model, uptake and release of ferritin iron is controlled by the available surface area of the small crystalline particles of hydrous ferric oxide found within the ferritin molecule. Evidence is also presented for the exchange of Fe3+ ions among the various cation sites within these crystallites.

scholarly journals An Experimental Investigation on the Effect of Ferrous Ferric Oxide Nano-Additive and Chicken Fat Methyl Ester on Performance and Emission Characteristics of Compression Ignition Engine

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 265
Author(s):  
Ameer Suhel ◽  
Norwazan Abdul Rahim ◽  
Mohd Rosdzimin Abdul Rahman ◽  
Khairol Amali Bin Ahmad ◽  
Yew Heng Teoh ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Ferric Oxide ◽  
Fossil Fuels ◽  
Specific Energy Consumption ◽  
Experimental Results ◽  
Compression Ignition ◽  
Gas Temperature ◽  
Compression Ignition Engine ◽  
Performance And Emission ◽  
Chicken Fat

In recent years, industries have been investing to develop a potential alternative fuel to substitute the depleting fossil fuels which emit noxious emissions. Present work investigated the effect of ferrous ferric oxide nano-additive on performance and emission parameters of compression ignition engine fuelled with chicken fat methyl ester blends. The nano-additive was included with various methyl ester blends at different ppm of 50, 100, and 150 through the ultrasonication process. Probe sonicator was utilized for nano-fuel preparation to inhibit the formation of agglomeration of nanoparticles in base fuel. Experimental results revealed that the addition of 100 ppm dosage of ferrous ferric oxide nanoparticles in blends significantly improves the combustion performance and substantially decrease the pernicious emissions of the engine. It is also found from an experimental results analysis that brake thermal efficiency (BTE) improved by 4.84%, a reduction in brake specific fuel consumption (BSFC) by 10.44%, brake specific energy consumption (BSEC) by 9.44%, exhaust gas temperature (EGT) by 19.47%, carbon monoxides (CO) by 53.22%, unburned hydrocarbon (UHC) by 21.73%, nitrogen oxides (NOx) by 15.39%, and smoke by 14.73% for the nano-fuel B20FFO100 blend. By seeing of analysis, it is concluded that the doping of ferrous ferric oxide nano-additive in chicken fat methyl ester blends shows an overall development in engine characteristics.

Modeling of sorption kinetics of U(VI) micro-quantities nanostructured materials with anatase mesoporous structures

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Veniamin Zheleznov ◽  
Aleksey Golikov ◽  
Tatiana Sokolnitskaya ◽  
Sergey Ivannikov
Keyword(s):  
Nanostructured Materials ◽  
Sorption Kinetics ◽  
Uranyl Ion ◽  
Competitive Sorption ◽  
Hydroxyl Groups ◽  
Complex Ions ◽  
The Stability ◽  
Kinetics Of ◽  
Mesoporous Structures ◽  
Ionic Forms

Abstract The sorption kinetics of uranyl ions micro-quantities from fluoride solutions by nanostructured materials with anatase mesoporous structures has been studied. Using the model of competitive sorption of ions and positively charged complexes of uranyl ion on deprotonated hydroxyl groups of an anatase, kinetic curves of changes in the ratio of ionic forms of uranium in solution were calculated. Modeling was carried out under the assumption of a two-stage mechanism of uranium complex ions sorption. The modeling considered the influence of the uranyl ion carbonate complexes formation. The shift in equilibrium among ionic forms of uranyl correlates with the stability of the complexes in solution.

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