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Kimura T.,University of Kitakyushu | Liu C.,China University of Geosciences | Li X.,University of Kitakyushu | Maekawa T.,Research Institute of Tsukuba Bio Technology Corporation | Asaoka S.,University of Kitakyushu
Journal of Biomedicine and Biotechnology | Year: 2012

In order to produce petroleum alternatives from biomass, a significant amount of research has been focused on oils from microalgae due to their origin, which would not affect food availability. Nanoporous hybrid catalysts composed of ns Al2O3 and zeolites have been proven to be very useful compared to traditional catalysts in hydrotreating (HT), hydrocracking (HC), and catalytic cracking (CC) of large molecules. To evaluate the reaction scheme and products from model isoprenoid compounds of microalgae oil, nanoporous hybrid catalyst technologies (CC: ns Al2O3/H-USY and ns Al2O3/H-GaAlMFI; HC: [Ni-Mo/-Al2O3]/ns Al2O3/H-beta) were studied. The major product from CC on ns Al2O3/H-USY was highly aromatic gasoline, while the product from HC was half-isoparaffinic/ olefinic kerosene. Although more than 50wt of the products from HT/CC on the USY catalyst was liquefied petroleum gas due to overcracking, the product from HT/CC on the MFI catalyst was high-octane-number gasoline. Delightfully, the product from HT/HC was kerosene and its average number was 11, with more than 80wt being isoparaffinic. As a result, it was demonstrated that hydrotreating may convert isoprenoid oil from microalgae over nanoporous hybrid catalysts into a variety of products. © Copyright 2012 Toshiyuki Kimura et al. Source


Takisawa K.,University of Tsukuba | Kanemoto K.,Research Institute of Tsukuba Bio Technology Corporation | Miyazaki T.,Research Institute of Tsukuba Bio Technology Corporation | Kitamura Y.,University of Tsukuba
Bioresource Technology | Year: 2013

Hydrolysis of lipids from microalgae under high water content was investigated as a pretreatment of direct esterification. Results indicated that the hydrolysis process reduced the inhibition by water in FAME production; in addition, FAME obtained by esterification of hydrolysates was increased by 181.7% compared to FAME obtained by direct transesterification under the same amount of water content (80%). This method has great potential in terms of biodiesel production from microalgae since it uses no organic solvent, reduces the drying cost and lowers the operating cost compared to any other traditional method. © 2013 Elsevier Ltd. Source


Takisawa K.,University of Tsukuba | Kanemoto K.,Research Institute of Tsukuba Bio Technology Corporation | Kartikawati M.,Research Institute of Tsukuba Bio Technology Corporation | Kitamura Y.,University of Tsukuba
Bioresource Technology | Year: 2013

This research demonstrated hydrolysis of wet microalgal lipid and esterification of free fatty acid (FFA) using acid in one-step process. The investigation of simultaneous hydrolysis-esterification (SHE) of wet microalgal lipid was conducted by using L27 orthogonal design and the effects of water content, volume of sulphuric acid, volume of methanol, temperature and time on SHE were examined. As a result, water content was found to be the most effective factor. The effects of various parameters on fatty acid methyl ester (FAME) content and equilibrium relation between FAME and FFA were also examined under water content 80%. Equimolar amounts of sulphuric acid and hydrochloric acid showed similar results. This method has great potential in terms of biodiesel production from microalgae since no organic solvents are used. © 2013 Elsevier Ltd. Source

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