title: One-step production of biodiesel from oils with high acid value by activated Mg-Al hydrotalcite nanoparticles.
abstract: Activated Mg-Al hydrotalcite (HT-Ca) nanoparticles (<45 nm) were synthesized by co-precipitation and hydrothermal activation with aqueous Ca(OH)2 solution. They were characterized by various techniques including X-ray diffraction, inductively coupled plasma atomic-emission spectrometer, Brunauer-Emmett-Teller method, scanning electronic microscope-X-ray energy dispersive analysis and temperature programmed desorption method. HT-Ca presented both acidic and basic due to the formation of Mg4Al2(OH)14 · 3H2O, Mg2Al(OH)7 and AlO(OH) nanocrystals to esterify and transesterify oils with high acid value (AV). Under conditions of 5 wt% HT-Ca, 160 °C, 30/1 methanol/oil molar ratio and 4h, 93.4% Jatropha biodiesel yield was obtained at AV of 6.3 mg KOH/g with 4 cycles (biodiesel yield>86%). It was further found that it can resist free fatty acids, and biodiesel yield reached 92.9% from soybean oil with high AV of 12.1. HT-Ca catalyst showed a potential practical application for direct production of biodiesel from oils with high AV without pretreatment.
authors.affiliation: Chinese Academy of Sciences, Biomass Group, Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, 88 Xuefulu, Kunming, Yunnan Province 650223, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China.
authors.forename: Yi-Tong
authors.initials: YT
authors.lastname: Wang
authors.affiliation: Chinese Academy of Sciences, Biomass Group, Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, 88 Xuefulu, Kunming, Yunnan Province 650223, China. Electronic address: zhenfang@xtbg.ac.cn.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Fang
authors.affiliation: Chinese Academy of Sciences, Biomass Group, Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, 88 Xuefulu, Kunming, Yunnan Province 650223, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Chinese Academy of Sciences, Biomass Group, Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, 88 Xuefulu, Kunming, Yunnan Province 650223, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China.
authors.forename: Bao-Jin
authors.initials: BJ
authors.lastname: Xue
mesh_terms: D000143:Acids / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D056804:Biofuels; D005230:Fatty Acids, Nonesterified / Q000737:chemistry; D031286:Jatropha / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry*; D013696:Temperature
chemical_list: D000143:Acids; D056804:Biofuels; D005230:Fatty Acids, Nonesterified; D010938:Plant Oils; C010467:hydrotalcite; D000536:Aluminum Hydroxide; D013024:Soybean Oil; D008274:Magnesium; D000537:Aluminum Oxide; D008276:Magnesium Hydroxide; D000432:Methanol
keywords: Activation; High acid value; Jatropha biodiesel; Mg–Al hydrotalcite; Nanoparticles