کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
208175 | 461241 | 2005 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of Na–A and –X zeolites from oil shale ash Synthesis of Na–A and –X zeolites from oil shale ash](/preview/png/208175.png)
The solid by-product of oil shale processing (PETROBRAS–Brazil) was used as a raw material to synthesize Na–A and –X zeolites. Two preparation methods using the same starting material composition were carried out. In Method (1), alkaline fusion was used to prepare a glass, which was then hydrated by refluxing. The largest amount of crystallinity was reached with 2 h 30 min of refluxing. In Method (2), alkaline fusion was followed by hydrothermal treatment. The most crystalline sample was obtained after 12 h of heat treatment, and after 96 h hydroxysodalite zeolite was formed. In both procedures, the synthesis products were mainly composed of Na–X zeolite, whose content was influenced by the crystallization time, and of Na–A zeolite, with a practically constant content.
Journal: Fuel - Volume 84, Issue 18, December 2005, Pages 2289–2294