Showing papers on "BET theory published in 1979"
TL;DR: In this article, a set of experimental reference isotherms, corresponding to definite ranges of the C BET constant value between 20 and about 3000, is proposed, which are very well fitted by the n-layers-BET equation, with n nearly equal to 4.
360 citations
Patent•
10 Jul 1979
TL;DR: In this article, the authors proposed a method to efficiently remove lower aldehydes in gas by bringing the gas into contact with activated carbon on which one or more out of I2, KI, Br2 and their alkali (earth) metal cpds have been supported.
Abstract: PURPOSE:To efficiently adsorption remove lower aldehydes in gas by bringing the gas into contact with activated carbon on which one or more out of I2, Br2 and their alkali (earth) metal cpds. have been supported. CONSTITUTION:Gas contg. lower aldehydes such as HCHO and CH3CHO of low concn., esp. below 1000 ppm is brought into contact with activated carbon on which one or more out of I2, KI, Br2, KBr, etc. have been supported to adsorption remove the aldehydes. The activated carbon is desirable to have a BET surface area above 1000 m /g and highly developed micropores. The amt. of the above additives supported on the carbon is about 0.01-20, esp. about 0.5-5 wt%. The resulting activated carbon can be used over a long term by repeating adsorption and desorption. It has large adsorption capacity and shows high adsorption speed.
4 citations
TL;DR: The adsorption of a number of polyaromatic hydrocarbons onto aqueous colloidal kaolin was studied in this article, where the fluorescence polarization and hence fluorescence anisotropy of the polyarsophores were measured as a function of their concentrations in a solution containing the colloid.
Abstract: The adsorption of a number of polyaromatic hydrocarbons onto aqueous colloidal kaolin was studied. The fluorescence polarization and hence the fluorescence anistropy of the hydrocarbons was measured as a function of their concentrations in aqueous solutions containing the colloid. The fluorescence anisotropy was found to be highest for dilute solutions of polyaromatic hydrocarbons, with often sharp decreases at higher concentrations. More concentrated solutions gave an isotropies similar to those of plain aqueous solutions of the fluorophores. The concentration versus fluorescence anisotropy curves and BET surface area data were used to calculate surface coverage of the colloid by the adsorbed hydrocarbons. Coverage in the range of 1% to 14% of the colloid surface was found at surface saturation for the compounds studied. This suggested that colloidal clays have the potential of transporting polyaromatic hydrocarbons through environmental waters.
4 citations
TL;DR: In this article, the adsorption isotherm of a gas in the presence of a solid surface is discussed in terms of the interaction energy of gas molecules with one another and with the solid surface.
Abstract: The adsorption isotherm of a gas in the presence of a solid surface is discussed in terms of the interaction energy of gas molecules with one another and with the solid surface. (AIP)
3 citations
Patent•
15 Oct 1979
TL;DR: In this article, a method to remove a minute quantity of alkylsulfides in gas, by adsorbing bromine to activated carbon contacting with the gas, is presented.
Abstract: PURPOSE:to enable to fully remove a minute quantity of alkylsulfides in gas, by adsorbing bromine to activated carbon contacting with the gas. CONSTITUTION:0.02-0.4mg, preferably 0.05-0.2mg, of Br per surface area m of activated carbon, is adsorbed on the activated carbon (preferably, having 400- 2000m /g of BET surface area, especially fine hole having less than 300Angstrom of diameter, is developed and also, having microhole of 10-30Angstrom of mean hole diameter). Gas phase adsorption method, liquid phase adsorption method or diameter dispersion method of liquid Br, are used for the above adsorption. Thus, the activated carbon adsorbed Br, is contacted with the gas to be treated by using fixed bed, moving bed or fluidized bed and alkylsulfides are removed. Contact temperature is 0-50 deg.c, preferably 15-30 deg.C and contact time is more than 0.1 second at 4 mm grain shape of granular carbon and is about 0.01 second at powdered coal. Less than 10ppm of alklsulfides is contained in the gas to be treated and another bad smell sulfur compounds are not contained substantially.
2 citations