The sorption and crystallographic characteristics of alumina activated in a reactor for pneumatic transport | Zendy

Ljiljana Rožić | Zendy; Tatjaovaković | Zendy; Srdjan Petrović | Zendy; Željko Čupić | Zendy; Željko Grbavčić | Zendy; Aleksandar Rosic | Zendy

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The sorption and crystallographic characteristics of alumina activated in a reactor for pneumatic transport

Author(s) -

Ljiljana Rožić,

Tatjaovaković,

Srdjan Petrović,

Željko Čupić,

Željko Grbavčić,

Aleksandar Rosic

Publication year - 2006

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0611237r

Subject(s) - gibbsite , microcrystalline , materials science , calcination , sorption , adsorption , specific surface area , desorption , fractal dimension , amorphous solid , chemical engineering , activated alumina , analytical chemistry (journal) , thermodynamics , fractal , chemistry , chromatography , crystallography , catalysis , composite material , organic chemistry , mathematical analysis , aluminium , physics , mathematics , engineering

Active transition alumina powders were obtained by flash calcination of gibbsite in a reactor for pneumatic transport in the dilute, two-phase flow regime in the temperature interval from 883 to 943 K with a residence time between 0.4 and 0.9 s. The results of X-ray diffraction analysis confirmed that the activated alumina samples were either microcrystalline or amorphous. From nitrogen adsorption-de- sorption isotherms, the specific surface areas of all samples were calculated by the BET method. Using the sorption data, the fractal dimension of the surface of the alu- mina samples was calculated according to a modified FHH method. By application of fractal geometry, using the values of the fractal dimension of the surface and of the specific surface area, the effective surface areas of the active aluminas were cal- culated for the adsorption of molecules having a cross-section area greater than that of the nitrogen molecule

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