期刊
BIORESOURCE TECHNOLOGY
卷 140, 期 -, 页码 179-186出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.04.084
关键词
Chlorella vulgaris; Coagulation; Immobilized lipase; SrO/SiO2; Transesterification
资金
- Taiwan's National Science Council [NSC100-3113-E-006-016-, NSC100-2218-E-126-002-, NSC99-2221-E-006-137-MY3]
Chlorella vulgaris ESP-31 containing 22.7% lipid was harvested by coagulation (using chitosan and polyaluminium chloride (PACl) as the coagulants) and centrifugation. The harvested ESP-31 was directly employed as the oil source for biodiesel production via transesterification catalyzed by immobilized Burkholderia lipase and by a synthesized solid catalyst (SrO/SiO2). Both enzymatic and chemical transesterification were significantly inhibited in the presence of PACl, while the immobilized lipase worked well with wet chitosan-coagulated ESP-31, giving a high biodiesel conversion of 97.6% w/w oil, which is at a level comparable to that of biodiesel conversion from centrifugation-harvested microalgae (97.1% w/w oil). The immobilized lipase can be repeatedly used for three cycles without significant loss of its activity. The solid catalyst SrO/SiO2 worked well with water-removed centrifuged ESP-31 with a biodiesel conversion of 80% w/w oil, but the conversion became lower (55.7-61.4% w/w oil) when using water-removed chitosan-coagulated ESP-31 as the oil source. (c) 2013 Elsevier Ltd. All rights reserved.
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