废大理石粉为绿色非均相催化剂,用凤尾莲油合成高性价比生物柴油

Jharna Gupta, M. Agarwal
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摘要

采用煅烧法研究了废大理石粉(WMP)制备非均相催化剂,并将其应用于山腰油酯化-酯交换法合成生物柴油。利用Hammet指标、傅里叶红外(FT-IR)、热重分析和x射线粉末衍射(XRD)等技术对废大理石粉末(WMP)催化剂进行了表征。大理岩粉经800℃煅烧后,碳酸钙转化为氧化钙。当催化剂质量分数为3.5 wt%,甲醇与桄子子籽油的摩尔比为9:1,反应时间为2.5 h,温度为65℃时,收率最高可达94%左右。采用气相色谱法检测生物柴油纯度。通过可回收性试验对催化剂的稳定性进行了测试,发现可循环运行5次后,生物柴油的产率略有下降。WMP固体多相催化剂的制备证明了有害废弃物可以转化为一种经济高效的固体多相催化剂,用于山腰油可持续生产生物柴油。
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Cost-Effective Biodiesel Synthesis from Waste Marble Powder as A Green Heterogeneous Catalyst Using Pongamia Pinnata Oil
Waste marble powder (WMP) is Investigated for developing heterogeneous catalysts by calcination method and used in biodiesel synthesis by esterification-transesterification process from Pongamia Pinnata oil. Hammet indicators, Fourier transform infrared (FT-IR), Thermogravimetric analysis, and X-ray powder diffraction (XRD) techniques were also studied for the characterization of developed catalyst from waste marble powder (WMP). The conversion of calcium carbonate to calcium oxide in marble powder was found at 800°C after calcination. The maximum biodiesel yield reached about 94% using a 3.5 wt% catalyst, 9:1 methanol to Pongamia pinnata oil molar ratio, and 2.5 hour process time at 65°C. The biodiesel purity was tested by gas chromatography analysis. The catalyst stability was tested by recyclability test and found a small decrease in biodiesel yield up to 5 recyclability runs. The solid heterogeneous catalyst from WMP proves that the harmful waste could be converted and used as an economically efficient solid heterogeneous catalyst for sustainable biodiesel production from Pongamia Pinnata oil.
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