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Effect of textural property of coconut shell-based activated carbon on desorption activation energy of benzothiophene

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 269-275页

作者： Moxin YU Zhong LI Hongxia XI Qibin XIA Shuwen WANG College of Chemical and energy Engineering South China University of TechnologyThe Key Laboratory of Enhanced Heat Transfer and Energy ConversationMinistry of EducationGuangzhou 510640China

In this work,the effect of the textural property of activated carbons on desorption activation energy and adsorption capacity for benzothiophene(BT)was *** surface areas and the textural parameters of three kinds of the activated carbons,namely SY-6,SY-13 and SY-19,were measured with an ASAP 2010 *** desorption activation energies of BT on the activated carbons were determined by temperature-programmed desorption(TPD).Static adsorption experiments were carried out to determine the isotherms of BT on the activated *** influence of the textural property of the activated carbons on desorption activation energy and the adsorption capacity for BT was *** showed that the BET surface areas of the activated carbons,SY-6,SY-13 and SY-19 were 1106,1070 and 689 m2·g^(-1),respectively,and their average pore diameters were 1.96,2.58 and 2.16 nm,*** TPD results indicated that the desorption activation energy of BT on the activated carbons,SY-6,SY-19 and SY-13 were 58.84,53.02 and 42.57 KJ/mol,*** isotherms showed that the amount of BT adsorbed on the activated carbons followed the order of SY-6>SY-19>*** smaller the average pore diameter of the activated carbon,the stronger its adsorption for BT and the higher the activation energy required for BT desorption on its *** Freundlich adsorption isotherm model can be properly used to formulate the adsorption behavior of BT on the activated carbons.

关键词： activated carbon benzothiophene desorption activation energy average pore diameter adsorption equilibrium

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Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

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Chinese Journal of Chemical Engineering 2008年第6期16卷 871-875页

作者：李晶李忠刘冰夏启斌奚红霞 School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China

This work mainly involves the study of effect of relative humidity on adsorption of formaldehyde on the activated carbons modified with organosilane solution. Modification of activated carbons was carded out by impregnating activated carbon with organosilane/methanol-containing solutions. The breakthrough curves of formaldehyde in the packed beds of original and modified activated carbons were measured, respectively, at relative humidity of 30%, 60%, and 80%. Temperature-programmed desorption （TPD） experiments were used to estimate the activation energy for desorption of formaldehyde from the activated carbon. Results showed that the relative humidity had strongly influence on breakthrough curves of formaldehyde in the packed beds. The higher the relative humidity of gas mixtures through the packed beds was, the smaller the breakthrough time of formaldehyde became. The use of organosilane compounds to modify surfaces of the activated carbon can enhance the interaction between formaldehyde and the surfaces, and as a result, the breakthrough times of formaldehyde in the packed beds of the modified activated carbon were longer than that in the packed bed of the unmodified activated carbon.

关键词： activated carbon formaldehyde breakthrough curve desorption activation energy

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INVESTIGATION OF THE INTERACTIONS BETWEEN WATER AND MODIFIED SILICA GEL BY IGC AND TPD

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Chinese Journal of Reactive Polymers 2006年第1期15卷 1-12页

作者： LI Xin LI Zhong XIA Qibin XI Hongxia The Key Lab of Enhanced Heat Transfer and energy Conservation College of Chemical Engineering and Energy South China University of Technology Guangzhou 510640 China

In this work, the thermodynamic parameters for the adsorption of water vapor on untreated silica gel and silica gel treated with hygroscopic salts and silane coupling agent were determined by lnverse Gas Chromatography （IGC） in the infinite dilution region. The desorption activation energies of the water vapor on virgin and modified silica gels were estimated by using the Temperature Programmed desorption （TPD） technique. The interactions between the water and the virgin and modified silica gels were discussed. Results showed that the thermodynamic parameters and desorption activation energy of water vapour on the silica gels increase with decreasing pore size and increasing the surface hydrophilic properties. The desorption activation energy of virgin and modified silica gels was found to increase with increasing the thermodynamic parameters. The larger the adsorption parameters and the desorption activation energy were, the interactions between water and virgin and modified silica gels were.

关键词： Silica gel Pore size Surface chemistry desorption activation energy Thermodynamic parameters

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