کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
74008 49077 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Methanol conversion to light olefins over sonochemically prepared SAPO-34 nanocatalyst
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Methanol conversion to light olefins over sonochemically prepared SAPO-34 nanocatalyst
چکیده انگلیسی

Methanol conversion to light olefins was investigated over sonochemically prepared SAPO-34 nanocatalyst (SONO-SAPO-34) with crystal sizes of about 50 nm and its catalytic properties were compared with those of 600 nm SAPO-34 catalyst synthesized hydrothermally (HT-SAPO-34). Both catalysts were used to elucidate the effect of crystallite size on their catalytic performance, especially in terms of life time. The product distribution over the two catalysts is almost the same, although their deactivation behaviors differ considerably. The HT-SAPO-34 catalyst with large crystals deactivates rapidly, while the SONO-SAPO-34 nanocatalyst retains its activity for a long time. This variation in catalytic deactivation according to the crystallite size of the SAPO-34 catalysts is attributed to the number of accessible cavities near their external surface and the diffusion limitation of the reactant and product molecules.

Figure optionsDownload as PowerPoint slideHighlights
► MTO reactions investigation over sonochemically prepared SAPO-34 nanocatalyst.
► The comparison of SONO-SAPO-34 catalytic properties with that of hydrothermally synthesized.
► SONO-SAPO-34 nanocatalyst has longer life time.
► The catalytic deactivation is attributed to the number of accessible cages near external surface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 163, 15 November 2012, Pages 334–342
نویسندگان
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