Efficient Adsorbent-Desiccant Based on Aluminium Oxide

The review describes the main methods of obtaining hydroxides and aluminium oxides (AO) of various structures from gibbsite. The promising techniques of obtaining AO adsorbents are discussed, namely the technique of thermal activation in the mode of pneumatic transport with gibbsite by heated air (T...

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Published inApplied sciences Vol. 11; no. 6; p. 2457
Main Authors Meshcheryakov, Eugene P., Reshetnikov, Sergey I., Sandu, Mariya P., Knyazev, Alexey S., Kurzina, Irina A.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2021
Subjects
adsorbent
Adsorbents
Adsorption
adsorption activity
aluminium oxide
Aluminum
Aluminum oxide
Bayer process
Cations
Compressed air
Desiccants
Gibbsite
Humidity
Hydroxides
Liquor
material modification with ions
Metals
Methods
Phase composition
Raw materials
Sintering
Water vapor
water vapour adsorption
Zeolites
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Summary:The review describes the main methods of obtaining hydroxides and aluminium oxides (AO) of various structures from gibbsite. The promising techniques of obtaining AO adsorbents are discussed, namely the technique of thermal activation in the mode of pneumatic transport with gibbsite by heated air (TCA Gb) and the technique of thermal activation of gibbsite in centrifugal flash reactors (CTA Gb). The main methods of improving the adsorbent properties of AO, such as the optimisation of texture characteristics and phase composition, as well as the influence of the modification of aluminium oxide adsorbents, obtained using CTA and TCA technologies with cations of alkaline metals, are considered. It is shown that the modification allows a controlled variation of the characteristics of donor and acceptor active sites on the surface of adsorbents and, thus, a substantial increase in their adsorption activity, in particular, with respect to water vapour.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11062457