کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6644587 | 461173 | 2012 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A new method for determining the acid number of ethanol fuel using coulometric titration
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new method is proposed to determine the acid number (AN) of ethanol fuel using coulometric titration with potentiometric detection. The method employs a potentiostat/galvanostat and an electrochemical cell containing a three-electrode system (Pt working electrode, Ag auxiliary electrode and Ag/AgCl reference electrode) and a glass pH electrode. It involves applying a constant current through the sample (formation of hydroxyl ions), which contains LiCl as supporting electrolyte, and acquiring the potential of the pH electrode. A preliminary evaluation of the method showed that carbon dioxide and metallic cations contribute significantly to the AN, whereas the addition of LiCl has two opposite effects: it increases the AN at low concentrations (unwanted reduction reactions) and decreases the AN due to the removal of some carbon dioxide (increase of polarity). The method was compared to a volumetric/potentiometric titration-based method to determine the AN of different ethanol samples, producing similar average results for the hydrated samples and lower standard deviations between replicates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 94, April 2012, Pages 70-74
Journal: Fuel - Volume 94, April 2012, Pages 70-74
نویسندگان
Fabiano Barbieri Gonzaga, Mary Ane Gonçalves, Sidney Pereira Sobral, Carla de Matos Ribeiro,