کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617521 | 49164 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observation of a rhombohedral phase change during the dehydration of zinc-exchanged zeolite A
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Observation of a rhombohedral phase change during the dehydration of zinc-exchanged zeolite A Observation of a rhombohedral phase change during the dehydration of zinc-exchanged zeolite A](/preview/png/9617521.png)
چکیده انگلیسی
Temperature dependent powder X-ray diffraction studies of zinc-exchanged zeolite A (LTA structure type; cubic at room temperature) have demonstrated the presence of a non-cubic phase between 150 °C and 600 °C. Analysis of the data indicated that a rhombohedral phase was formed with refined lattice parameters a = 17.182(3) Ã
and α = 59.147(9)° (after quenching from 150 °C to room temperature under vacuum). Heating above 600 °C produced a second cubic phase, which persisted upon cooling, and the rhombohedral phase only appeared for samples that had not been heated above 600 °C. The distortion from cubic symmetry may be linked to the formation of species such as Znx(H2O)ym+ or Znx(H2O)y(OH)zn+ during dehydration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 86, Issues 1â3, 28 November 2005, Pages 96-105
Journal: Microporous and Mesoporous Materials - Volume 86, Issues 1â3, 28 November 2005, Pages 96-105
نویسندگان
Jennifer E. Readman, Ian Gameson, Joseph A. Hriljac, Paul A. Anderson,