کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
41453 45889 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene
چکیده انگلیسی

Protonated ZSM-5 zeolites (HZSM-5(M), M = Al, Ga, and Fe) having different acid strengths were prepared under various synthesis conditions, and the effect of acidity of the ZSM-5 zeolite on the conversion of ethanol to propylene was investigated in detail. HZSM-5(Ga) and HZSM-5(Al) showed high propylene yields. However, HZSM-5(Fe) yielded ethylene instead of propylene, i.e., only dehydration of ethanol occurred on HZSM-5(Fe). These results indicate that the acid strength is a crucial factor for the selective production of propylene. In other words, for successful selective conversion of ethanol to propylene, HZSM-5(M) zeolites must contain acid sites with an acid strength that is more than that of HZSM-5(Ga). It was also found that phosphorous-modified HZSM-5(Ga) zeolite exhibited an improved propylene yield relative to the unmodified zeolite and that the modification considerably enhanced the catalytic stability because of the suppression of both elimination of framework gallium and coke deposition.

Figure optionsDownload high-quality image (91 K)Download as PowerPoint slideHighlights
► HZSM-5(M) (M = Al, Ga, and Fe) zeolites having different acid strengths were prepared.
► High propylene yields were obtained over HZSM-5(Ga) and HZSM-5(Al).
► P-modification was effective for improving the catalytic performance of HZSM-5(Ga).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 262–267
نویسندگان
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