سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۵

نویسنده(ها):

Hossein Ghasemi Mobtaker – Nuclear Science Research School, Nuclear Science and Technology Research Institute
Hossein Kazemian – R&D Lab. Of SPAG Co., Technology incubator, Sci & Technol. Park of Tehran University, Tehran, Iran,
Seyed Mohammad Reza pakzad – Nuclear Science Research School, Nuclear Science and Technology Research Institute
ali Malekinejad – Nuclear Science Research School, Nuclear Science and Technology Research Institute

چکیده:

Steamed HY or ultrastable Y (H-USY) zeolites are active hydrocarbon cracking catalysts. It concludes
that the large enhancement in cracking activity by steaming is due to increase in external surface area of the
zeolite crystals and possibly a small increase in the specific initiation activity of each site. Dealumination of
steamed zeolite by nitric acid, acid form of EDTA and oxalic acid treatment was investigated. The results
showed that these acids are effective in removing non-framework Al as well as framework Al from the
crystal. The collapse of crystal framework is depended on degree of dealumination.