IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1011-1017    Article in Press

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M. Aghaei, M. Anbia and A. H. Hosseiny
( Received: November 18, 2017 – Accepted: February 08, 2018 )

Abstract    Colloidal silica, sodium aluminate and sodium hydroxide have been used as raw materials to synthesize zeolite 13X by hydrothermal reaction. Synthesized zeolite 13X has been characterized by x-ray diffraction (XRD), N2 adsorption-desorption Technique, thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Polyvinyl alcohol (PVA) and polyethylene glycol (PEG) were added to zeolite powder as organic binders and effect of calcination temperature and calcination time on physical and mechanical properties of granules have been studied. Results of CO2 adsorption capacity and crush strength test agreed well with TG-DTA results. Interpretation of the results has shown that the use of high temperature and longer periods of time for calcining the adsorbents has a positive effect on their mechanical properties but its effect on the physical properties such as CO2 adsorption capacity, Surface area and pore size is negative.


Keywords    Zeolite 13X, Agglomeration, Organic binder, Calcination, CO2 adsorption


چکیده    سیلیکای کلوئیدی، سدیم آلومینات و سدیم هیدروکسید برای سنتز هیدروترمال زئولیت 13X استفاده شدند. زئولیت 13X سنتز شده توسط روش‌های پراش پرتو ایکس (XRD)، آنالیز جذب و واجذب نیتروژن، تکنیک آنالیز وزن سنجی حرارتی (TGA) و آنالیز حرارتی افتراقی (DTA) مورد بررسی قرار گرفتند. پلی وینیل الکل (PVA) و پلی اتیلن گلیکول (PEG) به عنوان بایندر برای شکل‌دهی به زئولیت اضافه شدند و سپس اثر دمای کلسینه کردن و مدت زمان کلسینه کردن بر روی خواص مکانیکی و فیزیکی زئولیت‌های گرانولی مورد بررسی قرار گرفتند. نتایج به دست آمده از ظرفیت جذب CO2 و استحکام مکانیکی گرانول‌ها تطابق خوبی با نتایج به دست آمده از آنالیزهای حرارتی TG-DTA داشت. تفسیر نتایج نشان داند که استفاده از دمای بالا برای کلسینه کردن و همچنین کلسینه کردن گرانول‌ها به مدت طولانی بر خواص مکانیکی آن‌ها اثر مثبت دارد اما بر خواص فیزیکی گرانول‌ها از جمله ظرفیت جذب CO2، مساحت سطح و اندازه حفره آن‌ها اثر منفی دارد.

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