این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
Iranian Journal of Chemical Engineering، جلد ۱۶، شماره ۱، صفحات ۲۲-۳۸
عنوان فارسی Synthesis of zeolite NaA nano-crystalls; effect of synthesis parameters on crystallinity and crystal size
چکیده فارسی مقاله Abstract
In this work hydrothermal synthesis of zeolite NaA crystals with a composition of Al2O3:aSiO2:bNa2O:cH2O was investigated. Effects of SiO2/Al2O3, Na2O/Al2O3 and H2O/Al2O3 ratios and crystallization temperature and time were studied on crystallinity and crystal size of zeolite NaA crystals. It was tried to understand the interactions between these parameters. The crystal species of zeolite NaA were characterized by XRD and SEM.
Considering the interactions between these parameters showed that effects of increasing SiO2/Al2O3 and Na2O/Al2O3 ratios simultaneously neutralize each other so that their overall effect is not significant. On the other hand, the effects of increasing SiO2/Al2O3 and H2O/Al2O3 ratios reinforce each other and significantly affect crystallinity and crystal size. Increasing alkalinity increases crystallization rate and reduces synthesis time. Also, effects of increasing crystallization temperature and time simultaneously reinforce the effects of each other.
The effect of decreasing alkalinity is moderated with that of increasing Na+ content in the synthesis gel.
کلیدواژه‌های فارسی مقاله Zeolite NaA،، Gel composition،، Crystallization conditions،، Crystallinity،، Crystal size،
عنوان انگلیسی Synthesis of zeolite NaA nano-crystalls; effect of synthesis parameters on crystallinity and crystal size
چکیده انگلیسی مقاله Abstract
In this work hydrothermal synthesis of zeolite NaA crystals with a composition of Al2O3:aSiO2:bNa2O:cH2O was investigated. Effects of SiO2/Al2O3, Na2O/Al2O3 and H2O/Al2O3 ratios and crystallization temperature and time were studied on crystallinity and crystal size of zeolite NaA crystals. It was tried to understand the interactions between these parameters. The crystal species of zeolite NaA were characterized by XRD and SEM.
Considering the interactions between these parameters showed that effects of increasing SiO2/Al2O3 and Na2O/Al2O3 ratios simultaneously neutralize each other so that their overall effect is not significant. On the other hand, the effects of increasing SiO2/Al2O3 and H2O/Al2O3 ratios reinforce each other and significantly affect crystallinity and crystal size. Increasing alkalinity increases crystallization rate and reduces synthesis time. Also, effects of increasing crystallization temperature and time simultaneously reinforce the effects of each other.
The effect of decreasing alkalinity is moderated with that of increasing Na+ content in the synthesis gel.
کلیدواژه‌های انگلیسی مقاله Zeolite NaA, Gel composition, Crystallization conditions, Crystallinity, Crystal size
نویسندگان مقاله S. M. Mirfendereski |
Mechanical and Energy Department, Shahid Beheshti University A.C.

نشانی اینترنتی http://www.ijche.com/article_84417_98221aefaceb6627b75c82d61c90d78e.pdf
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/443/article-443-1355447.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات