کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6475059 1424968 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sustainable biodiesel production via transesterification by using recyclable Ca2MgSi2O7 catalyst
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Sustainable biodiesel production via transesterification by using recyclable Ca2MgSi2O7 catalyst
چکیده انگلیسی

Ca2MgSi2O7 has been investigated in the transesterification of rapeseed oil with a view to determining its viability as a solid base catalyst for use in biodiesel synthesis. This catalyst exhibited both high catalytic activity and reusability, giving a fatty acid methyl ester (FAME) conversion of 99% when the reaction was conducted with 20 wt% catalyst and a methanol/oil molar ratio of 10:1 at 190 °C over 6 h. The FAME conversion remained >85% after 16 cycles without catalyst compensation. BET test illustrates that Ca2MgSi2O7 has a narrow pore size distribution centred at 5.0 nm. Transesterification takes place on the catalyst surface, the basic characteristics or basicity of the catalyst decide greatly catalytic activity. CO2-TPD analysis showed that the total number of basic sites of åkermanite is 0.8822 mmol·g−1. This includes three different oxygen anions exhibiting different chemical environments on the catalyst surface. The basic strength of oxygen anions increased in the order O2 < O3 < O1, which were identified by XPS. In addition, the excellent reusability of the catalyst was associated with the presence of stable [MgO4] and [CaO8] structures. These results suggest that Ca2MgSi2O7 is a promising catalyst for biodiesel synthesis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 196, 15 May 2017, Pages 306-313
نویسندگان
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