scholarly journals Short beds for chromatographic measurement of adsorption equilibrium constants.

1982 ◽  
Vol 15 (3) ◽  
pp. 232-235 ◽  
Author(s):  
DONG IL LEE ◽  
MOHAMED A. FAHIM ◽  
SEIICHIRO KAGUEI ◽  
NORIAKI WAKAO
Keyword(s):  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Chromatographic Measurement

Supercritical CO2 regeneration of activated carbon loaded with organic adsorbates

1997 ◽  
Vol 35 (7) ◽  
pp. 261-268 ◽  
Author(s):  
Kazuyuki Chihara ◽  
Kanji Oomori ◽  
Takao Oono ◽  
Yosuke Mochizuki
Keyword(s):  
Activated Carbon ◽  
Cost Estimation ◽  
Supercritical Co2 ◽  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Adsorption Dynamics ◽  
Boiling Points ◽  
Organic Adsorbates ◽  
Carbon Regeneration ◽  
Co2 Density

Supercritical CO2 regeneration is one of the possibilities for spent carbon regeneration loaded with some organics. Here, adsorption equilibrium and adsorption dynamics were evaluated for some typical organic pollutants under some supercritical CO2 conditions. A supercritical CO2 chromatograph packed with activated carbon (F-400, CAL) was used to detect the pulse responses of organics, which were analyzed by moment analysis. Adsorption equilibrium constants of some organics varied with CO2 density and their boiling points. Possibility of regeneration of each substance was discussed. Cost estimation was necessary and was the key point of this technique.

Enhanced Oxidation of Air Contaminants on an Ultra-Low Density UV-Accessible Aerogel Photocatalyst

1996 ◽  
Vol 454 ◽  
Author(s):  
M. Dreyer ◽  
G. K. Newman ◽  
L. Lobban ◽  
S. J. Kersey ◽  
R. Wang ◽  
...  
Keyword(s):  
Reaction Rate ◽  
Adsorption Equilibrium ◽  
Uv Light ◽  
Equilibrium Constants ◽  
Main Stream ◽  
Low Density ◽  
Air Contaminants ◽  
Reaction Rate Constants ◽  
Air Contaminant ◽  
Type Rate

ABSTRACTThis research developed new forms of photocatalysts that could potentially move photocatalytic degradation of air contaminants into the main stream of industrially used remediation technologies. Tests of the photocatalytic activity of the TiO2 aerogel catalysts have been carried out using both acetone and methane as the air contaminant. For comparison, the same tests were carried out on a standard (non-aerogel) anatase powder. Despite having very low crystallinity, the aerogel decontaminates the air far more effectively than an equal volume of the anatase powder which indicates that a much larger fraction of the aerogel is activated by the UV light. Experimental data were used to determine adsorption equilibrium constants for acetone, and to determine reaction rate constants assuming a Langmuir-Hinshelwood type rate expression.

Effect of Silicon on Phosphorus Adsorption of Two Synthetic Iron Oxides

2013 ◽  
Vol 726-731 ◽  
pp. 325-330
Author(s):  
Ming Da Liu ◽  
Feng Jiang ◽  
Hui Sun ◽  
Dan Yang ◽  
Yu Long Zhang ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Phosphorus Adsorption ◽  
X Ray ◽  
Transmission Electron ◽  
Effects Of Ph

Iron oxides play an important role in controlling P activity and availability in environmental systems. Two iron oxides (goethite and ferrihydrite) were synthesized characterized by X-ray diffraction, transmission electron microscopy and N2 adsorption method. To investigate the effect of silicon on phosphorus adsorption of them, batch equilibration method was used. Attempts were made to explore the mechanisms involved by eliminating effects of pH and accompany ions. Results reveal that the ability of two kinds of iron oxides adsorbed phosphorus were as follows: ferrihydrite > goethite. Compared with the control, silicon inhibited the adsorption of phosphorus on two iron oxides, and this effect increased with the increasing of silicon content. Langmuir, Freundlich and Temkin equations could be used to describe the adsorption characteristics of phosphorus on iron oxides well, but the Langmuir model was optimal. With silicon addition, the adsorption equilibrium constants (K) decreased of the phosphorus absorbed on iron oxide, the free energy(ΔG)dropping degree increased, the maximum adsorption capacity(Xm)and maximum buffering capacity (MBC) reduced.

Diffusion Resistances and Contribution of Surface Diffusion in TAME and TAEE Production Using Amberlyst-15

2002 ◽  
Vol 1 (1) ◽  
Author(s):  
Timur Dogu ◽  
Ebru Aydin ◽  
Nezahat Boz ◽  
Kirali Murtezaoglu ◽  
Gulsen Dogu
Keyword(s):  
Surface Diffusion ◽  
Adsorption Equilibrium ◽  
Diffusion Flux ◽  
Equilibrium Constants ◽  
Effective Diffusion ◽  
Batch Adsorption ◽  
Diffusion Resistance ◽  
Amberlyst 15 ◽  
Effective Diffusion Coefficients ◽  
Effective Diffusivities

Effective diffusivities and adsorption equilibrium constants of methanol, ethanol and 2-methyl-2-butene (2M2B), in Amberlyst 15, were evaluated from batch adsorption experiments. Moment expressions derived for different models involving diffusion resistances in the macropores and within the gel-like micrograins were used for the evaluation of effective diffusion coefficients. Contribution of surface diffusion to diffusion flux within the macropores was found to be quite significant. Also, it was found that diffusion resistance in liquid filled macropores was much more significant than diffusion resistance within the gel-like micrograins of Amberlyst 15., for methanol, ethanol and 2M2B.

scholarly journals Determination of the Adsorption Equilibrium of Alcohols and Alkenes on a Sulphonated Styrene–Divinylbenzene Copolymer

2006 ◽  
Vol 24 (3) ◽  
pp. 239-256 ◽  
Author(s):  
Piotr M. Słomkiewicz
Keyword(s):  
Gas Chromatography ◽  
Inverse Gas Chromatography ◽  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Catalytic Reactions ◽  
Amberlyst 15 ◽  
Physical Integrity ◽  
Styrene Divinylbenzene

The adsorption equilibrium constants of the alcohols: methanol, ethanol and propan-1-ol, and of the alkenes: 2-methylpropene, 2-methylbut-1-ene, 2-methylbut-2-ene, 2-methylpent-1-ene, 2-methylpent-2-ene and 2-methylhex-2-ene, onto the sulphonated styrene–divinylbenzene copolymer Amberlyst 15 were determined by inverse gas chromatography. During the adsorption measurements, catalytic reactions such as dehydration of the alcohols as well as isomerization and dimerization of the alkenes were controlled to see whether or not they occurred on the surface of Amberlyst 15. The physical integrity of the adsorption equilibrium constants determined experimentally for the alkenes was verified by calculation of their adsorption enthalpies and the use of Boudart's rules.

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