Upgrading catalytic activity of NiO/CaO/MgO from natural limestone as catalysts for transesterification of coconut oil to biodiesel

编号 020029001

推送时间 20210510

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Upgrading catalytic activity of NiO/CaO/MgO from natural limestone as catalysts for transesterification of coconut oil to biodiesel

来源期刊 Biomass Conversion and Biorefinery

期 第290期

发表时间 20210211

关键词 Biodiesel;  Limestone;  Methyl ester;  PEG;  Vegetable oil; 

摘要 Limestone was converted to high surface area CaO/MgO catalysts via calcination-hydration-dehydration (CHD) method for transesterification of coconut oil to biodiesel. Thermal?decomposition?at 900 degrees C transformed dolomite CaMg(CO3)(2) to large crystallite and low surface area CaO/MgO. CHD treatment eliminated the large CaO/MgO aggregates and increased the surface area and the activity of CaO/MgO. The addition of polyethylene glycol (PEG) as surfactant during CHD reduced the CaO/MgO crystallite size to similar to 377 nm and enhanced the surface area (39 m(2)/g), the pore volume (0.0322 m(3)/g), and the basicity of the catalysts (7.8 mmol/g). Transesterification of coconut oil showed an increase in oil conversion from 16.45 to 49.27% when CaO/MgO was produced using PEG. Optimization studies at the variation of reaction temperatures, the ratio methanol:oil, and the amount of catalysts produced the optimum biodiesel yield of 81.76%. Impregnation with 5% NiO introduced acid-base functionality for esterification FFA to FAME, further improved biodiesel yield to 90%, and reduced the FFA yield. The kinematic, density, flash point, acid numbe,r and carbon residue of biodiesel from coconut oil were determined at 1.93 mm(2/)s, 0.86g/cm(3), 137 degrees C, 0.27 mg KOH/g, and 0.22% respectively, and were within the ASTM D6751 standard.

服务人员 尚玮姣

服务院士 宋湛谦

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