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题名:
Facile synthesis of 5A zeolite from attapulgite clay for adsorption of n-paraffins 
作者:
Chen, Le,Wang, Yue-Wei,He, Ming-Yang,Chen, Qun,Zhang, Zhi-Hui, 
作者单位: Changzhou Univ, Sch Petrochem Engn, Jiangsu Key Lab Adv Catalyt Mat & Technol, 1 Gehu Rd, Changzhou 213164, Jiangsu, Peoples R China 
发表形式: 期刊 
发表载体: Adsorption 
年卷期:  
发表时间: 2016 
总页数:
分类号:  
关键词: 5A Zeolite,Attapulgite clay,Adsorption,n-Paraffin 
正文语种: eng 

文摘:

  5A zeolites were facilely synthesized from attapulgite clay and sodium aluminate precursors. The optimum synthesis condition for 4A zeolite (Na-form) were H2O/attapulgite ratio of 40:1 volume/mass, NaOH/attapulgite mass ratio of 2.35:1, the crystallization time was 4 h at 80-85 A degrees C. The 4A zeolite was converted to related 5A zeolite (Ca-form) through ionic exchanges using calcium chloride solution with the Si/Al mole ratio of 1.3. SEM images demonstrated that as-synthesized 5A zeolites are ordered cubic crystals, average crystals length dimension is 1-2 mu m. And the zeolites product had a specific surface area of 482 m(2) g(-1) and total pore volume of 0.274 cm(3) g(-1). The static adsorption experiments showed that the equilibrium adsorption capacities of n-decane and n-pentadecane on produced 5A zeolite were 0.253 and 0.510 g g(-1), respectively. And the adsorption equilibrium time of n-decane and n-pentadecane on 5A zeolite were 45 and 60 min, respectively. The experimental adsorption data of n-decane and n-pentadecane on three zeolites could be properly fitted by the Langmuir-Freundlich isotherm model. 

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