scholarly journals Studies of Water-Vapour Adsorption Dynamics of High-Efficiency Desiccant Based on Aluminium Oxide and NaX Zeolite

2020 ◽  
Vol 10 (15) ◽  
pp. 5320
Author(s):  
Eugene Meshcheryakov ◽  
Maxim Kozlov ◽  
Sergey Reshetnikov ◽  
Lyubov Isupova ◽  
Alesia Livanova ◽  
...  
Keyword(s):  
Water Vapour ◽  
Atmospheric Pressure ◽  
High Efficiency ◽  
Experimental Studies ◽  
Aluminium Oxide ◽  
Dynamic Capacity ◽  
Nax Zeolite ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption ◽  
Increased Pressure

The dynamic capacity of the commercial desiccant (NaX zeolite) and the adsorbent, synthesised based on low-temperature modifications of aluminium oxide, obtained from bayerite-containing hydroxide, was determined with respect to water vapour. Experimental studies were carried out using a pilot installation at the atmospheric pressure and increased pressure (up to 0.6 MPa) and high humidity. The increase in the height of the layer of the adsorbents leads to an increase of their dynamic capacity with respect to water vapour and the protective power (action) time of the layer. It was shown that at the atmospheric pressure and the pressure of up to 0.3 MPa, the dynamic capacity of NaX is greater; at a higher pressure, the adsorption capacity of the developed adsorbent Al2O3 becomes greater than the zeolite capacity, which allows recommending it as a desiccant at increased pressure.

Study of water vapour adsorption kinetics on aluminium oxide materials

2017 ◽  
Author(s):  
Alesya Livanova ◽  
Evgeniy Meshcheryakov ◽  
Sergey Reshetnikov ◽  
Irina Kurzina
Keyword(s):  
Water Vapour ◽  
Adsorption Kinetics ◽  
Aluminium Oxide ◽  
Oxide Materials ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption

scholarly journals Changes in the size of the apparent surface area and adsorption energy of the rye roots by low pH and the presence of aluminium ions induced

2016 ◽  
Vol 30 (3) ◽  
pp. 375-381 ◽  
Author(s):  
Alicja Szatanik-Kloc
Keyword(s):  
Surface Area ◽  
Water Vapour ◽  
Adsorption Energy ◽  
High Energy ◽  
Root Surface ◽  
Low Ph ◽  
Vapour Adsorption ◽  
Average Water ◽  
Water Vapour Adsorption ◽  
Adsorption Desorption

Abstract The plant reactions on Al-stress include i.a. change of the surface area of the roots, which in the physicochemistry of plants characterizes the transport of water and ions through the root. The object of this study is the specific surface area of the roots of plants which are tolerant to aluminium, such as rye. Plants of rye were grown in a nutrient solution for 14 days at pH 4.5 in the presence of Al3+ ions of concentration 10, 20, and 40 mg dm−3. The control plants were grown continuously at pH 7 or pH 4.5 without Al3+. The apparent surface area and adsorption energy of the plants roots were determined from water vapour adsorption – desorption data. The apparent surface area of roots growing in the aluminium was (with respect to control) statistically significantly lower. There were no statistically significant differences in the apparent surface area of the roots which grew in pH 7, pH 4.5 without Al3+. The average water vapour adsorption energy of the root surface, under stress conditions decreased. In the roots grown in the presence of Al+3, there was a slight decrease in high energy adsorption centres and an increase in the amount of low-energy centres.

Synthetic allophane from highconcentration solutions: nanoengineering of the porous solid

Clay Minerals ◽  
2002 ◽  
Vol 37 (3) ◽  
pp. 451-456 ◽  
Author(s):  
F. Ohashi ◽  
S.-I . Wada ◽  
M. Suzuki ◽  
M. Maeda ◽  
S. Tomura
Keyword(s):  
Water Vapour ◽  
Particle Diameter ◽  
Amorphous Structure ◽  
Water Vapour Pressure ◽  
Transmission Electron ◽  
Bet Specific Surface Area ◽  
Relative Water ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption ◽  
Adsorption Desorption

AbstractThe amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10 – 100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorphous structure with a particle diameter of 3 – 5 nm. The amorphous products had a high BET specific surface area (490 – 552 m2/g) in comparison with natural allophane and had a narrow pore-size distribution (2 – 5 nm in diameter). The results of water vapour adsorption isotherm studies showed a gradual increase over the range of relative water vapour pressure of 0.6 – 0.9 and reached a maximum of ∼85 wt.%. The synthetic allophane shows promise as an adsorbent material because of its high adsorption-desorption capacity and its unique structure.

Water vapour adsorption on coal

Fuel ◽  
2011 ◽  
Vol 90 (5) ◽  
pp. 1892-1899 ◽  
Author(s):  
Martina Švábová ◽  
Zuzana Weishauptová ◽  
Oldřich Přibyl
Keyword(s):  
Water Vapour ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption
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