NDLI: Structural and energetic properties of carbosils hydrothermally treated in the classical autoclave or the microwave reactor

Content Provider	Springer Nature Link
Author	Skubiszewska Zięba, J.
Copyright Year	2008
Abstract	Carbon/silica adsorbents (carbosils) prepared by pyrolysis of CH2Cl2 at 823 K and the reaction time from 0.5 to 6 h on the mesoporous silica gel surface (Si-60, Merck, granule size 0.2–0.5 mm) and then hydrothermally treated at 473 K with steam or liquid water by using the classical autoclave with traditional heating way or in the microwave reactor were studied by means of TG, adsorption and Q-TG methods. Changes in the structural characteristics of hybrid adsorbents before and after hydrothermal treatment were analyzed on the basis of nitrogen adsorption. Thermal properties of initial and modified samples as well as concentration of carbon deposit were studied using thermogravimetry (TG) in the range of 293–1273 K. The adsorbed water layers were investigated by means of thermodesorption of water under the quasi-isothermal conditions (Q-TG) in the range of 293–573 K. Concentration of weakly and strongly adsorbed water and the surface free energy on the interphase of adsorbent/water were calculated. It was stated that hydrothermal treatment in the microwave reactor, contrary to that in the classical autoclave, allows to obtain adsorbents with noticeably higher values of total pore volume in relation to the initial adsorbents and in majority with a higher specific surface area. Application of microwave energy allows to obtain adsorbents with lower values of surface free energy in relation to the initial adsorbents and those modified in the autoclave.
Starting Page	695
Ending Page	709
Page Count	15
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	14
Issue Number	4-5
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2008-05-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon-silica adsorbents Hydrothermal treatment Porous structure Quasi-isothermal method Adsorbed water layers Gibbs free energy Free surface energy Engineering Thermodynamics, Transport Phenomena Surfaces and Interfaces, Thin Films Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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