Journal Title
Title of Journal: Adsorption
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Authors: Hui Sun Benxian Shen
Publish Date: 2012/05/03
Volume: 18, Issue: 2, Pages: 103-111
Abstract
The crystallization of zeolite A was monitored by measuring the adsorption capacities of synthetic products The influences of organic additives on the crystallization process and adsorption performances of zeolite were investigated SDS sodium dodecyl sulphonate TWEEN Tween80 and PEG polyethylene glycol shorten the induction period by reducing the interfacial energy while SCMC sodium carboxymethylcellulose can prolong the induction period by increasing the interfacial energy TEA triethanolamine can also suppress the nucleation through reducing the effective supply of aluminum All the organic additives but SCMC diminish the rate of crystal growth CTAB cetyltrimethylammonium bromide causes the destruction of crystal structure and reduce the concentration of OH− ions As a result the rate of crystal growth is significantly reduced Meanwhile PAM polyacrylamide SDS TWEEN HMTA hexamethylenetetramine and PEG increase the viscosities of synthesis systems thus diminish the growth rate PAM restrains the transformation of zeolite A crystal into hydroxysodalite one therefore tremendously improves the stability of crystals of zeolite A In addition PAM can promote the rates of nhexane adsorption on zeolite 5A because of the impact of PAM on the crystalsize distributions of zeolite 5A
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