| 简介 |
Crystalline microporous zeolites designated calcined UZM-22 and UZM-22HS have been synthesized. The calcined UZM-22 is represented by the empirical formula : [in-line-formulae]M1′mn+Al1-xExSiyOz [/in-line-formulae] and UZM-22HS has an empirical formula of : [in-line-formulae]M1an+Al(1-x)ExSiy′Oz″[/in-line-formulae] where M1 and M1′ are exchangeable cations such as lithium or strontium and E is a framework element such as gallium. Both zeolites are obtained from an as synthesized microporous crystalline composition having an empirical formula of : [in-line-formulae]Mmn+RrAl1-xExSiyOz [/in-line-formulae] either by calcination for UZM-22 or by various treatments such as ammonium hexafluorosilicate treatment for UZM-22HS.M is an alkali, alkaline earth, or rare earth metal such as lithium and strontium, R is a singly charged organoammonium cation such as the choline cation and E is a framework element such as gallium. |
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