کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10243122 46914 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic dehydration of methanol to dimethyl ether (DME) over solid-acid catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic dehydration of methanol to dimethyl ether (DME) over solid-acid catalysts
چکیده انگلیسی
A series of solid-acid catalysts with different components contents were prepared by coprecipitation (sol-gel) method. These samples comprised γ-alumina and modified γ-Al2O3 with silica. The effects of silica various contents have been investigated on purpose to determine an optimum one. Dehydration of methanol to dimethyl ether (DME) on solid-acid catalysts was studied in a fixed-bed flow reactor at a temperature of 300 °C under atmospheric pressure and a GHSV of 15,600 h−1. The catalysts have been characterized using BET, TGA, XRD, NH3-TPD and elemental analysis techniques and also the results are reported. According to the experimental results, the pure γ-Al2O3 catalyst shown a good catalytic activity, but this sample undergoes a fairly rapid and irreversible deactivation. Silica-modified catalysts have shown better performance compared to the untreated γ-Al2O3. It was found that surface areas increase with increasing in the silica loading at aluminosilicate catalysts. Also, by modifying alumina with silica, it was observed that the surface acidity of aluminosilicate catalysts increased with increasing in silica loading. The sample with 6 wt% silica loading has exhibited the best conversion without any by-product.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Communications - Volume 6, Issue 2, February 2005, Pages 147-152
نویسندگان
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