Oxidative stability and corrosivity of biodiesel produced from residual cooking oil exposed to copper and carbon steel under simulated storage conditions: Dual effect of antioxidants
| Autor: | Anizio M. Faria, Mônica A. Rodrigues, André L. Squissato, Jian F.S. Pereira, Eduardo M. Richter, Rodrigo A.A. Munoz, Renata C. Lima, Dalyelli S. Serqueira |
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| Rok vydání: | 2021 |
| Předmět: |
Biodiesel
060102 archaeology Carbon steel Renewable Energy Sustainability and the Environment 020209 energy Induction period chemistry.chemical_element 06 humanities and the arts 02 engineering and technology engineering.material Copper Oxygen Corrosion Metal chemistry Chemical engineering visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium engineering 0601 history and archaeology Carbon |
| Zdroj: | Renewable Energy. 164:1485-1495 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2020.10.097 |
| Popis: | This work investigates the oxidative stability and corrosivity of residual cooking oil (RCO) methyl biodiesel exposed to metallic coupons (copper and carbon steel) under simulated storage conditions (static immersion for 90 days within closed vessels) and the effect of antioxidants (tert-butylhydroquinone, curcumin, propylgallate, and butyl-hydroxyanisole) on biodiesel and metallic surfaces. The induction period measured during the experiment showed that all antioxidants retarded biodiesel degradation due to their antioxidant properties. Scanning-electron microscopy and X-ray diffraction of the metallic surfaces revealed the presence of oxides due to the corrosion by biodiesel in absence of antioxidants. Nevertheless, the presence of carbonaceous solids over the metallic surfaces was found which evidences the anticorrosive properties of the antioxidants, confirmed by X-Ray spectroscopy that showed increase in the content of carbon and oxygen on the surfaces. Measurements of corrosion rate also confirmed the anticorrosive action of all antioxidants. Hence, this work shows the dual properties of antioxidants acting as free radical scavengers in the RCO biodiesel as well as corrosive inhibitors, with a special performance of propylgallate, probably due to the presence of more hydroxyl groups in its structure that also may facilitate its interaction with the metallic surface. |
| Databáze: | OpenAIRE |
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