کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7159921 | 1462836 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and esterification performance of sulfonated coal-based heterogeneous acid catalyst for methyl oleate production
ترجمه فارسی عنوان
عملکرد آماده سازی و استراز سازی کاتالیزور اسید ناهمگون اسید سولفونیک برای تولید متیل یولات
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کلمات کلیدی
سولفونیت، کاتالیزور اسید ناهمگن مبتنی بر ذغال سنگ، استرینگ، بیودیزل،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
A series of coal-based heterogeneous acid catalysts are prepared by partial carbonization followed by sulfonation approach and the performances in esterification for methyl oleate production are conducted. Characterization methods of XRD, N2 adsorption-desorption, SEM, TG, FTIR, EDX, acid density tests and Hammett indicator method are carried out to reveal the physical and chemical characteristics of the prepared catalysts. Catalyst with the highest acid density of 1.09 mmol gâ1 could be prepared under the condition of carbonization temperature at 350 °C for 2 h and sulfonation with concentrated sulfuric acid at 135 °C for 4 h. Acid value reduction of 97.29% on oleic acid through esterification with methanol, which is catalyzed by this coal-based heterogeneous acid, could be achieved under the optimized condition of 10 wt.% catalyst dosage, molar ratio of methanol/oleic acid of 10, reaction temperature at 67 °C and reaction duration of 4 h. Characterization results demonstrate that carbon in the catalyst, which is composed of aromatic carbon sheets with COOH and SO3H groups, is in amorphous structure and its acid strength is 3.3 < pKa < 0.8. Meanwhile, this catalyst could provide favorable thermal stability high to 220 °C and retain satisfactory catalytic activity after five cycles. In addition, catalytic capability could be reactivated with the acid value reduction efficiency of 95.30% after the fifth re-usage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 126, 15 October 2016, Pages 488-496
Journal: Energy Conversion and Management - Volume 126, 15 October 2016, Pages 488-496
نویسندگان
Hewei Yu, Shengli Niu, Chunmei Lu, Jing Li, Yanzhao Yang,