Two-step microalgal biodiesel production using acidic catalyst generated from pyrolysis-derived bio-char

Dong, Tao; Gao, Difeng; Miao, Chao; Yu, Xiaochen; Degan, Charles; Garcı̀a-Pèrez, Manuel; Rasco, Barbara; Sablani, Shyam S.; Chen, Shulin

doi:10.1016/j.enconman.2015.06.072

Cited by 98 publications

(53 citation statements)

References 38 publications

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“…Biomass refining, which mimics petroleum refining, intends to produce valuable chemicals, fuels, and functional materials from biomass. Biochar-based catalysts are used in various biomass refining processes, such as biomass hydrolysis and dehydration [13,14], biodiesel production [2,27], biomass pyrolysis [28], bio-oil upgrading [4,28], tar removal [29,30], and the Fischer-Tropsch synthesis of liquid hydrocarbons from syngas [31], etc. Detailed information can be found in related reviews [6,13,14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Biochar-Based Catalysts for Biofuel Production

Cheng

2018

Catalysts

200

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Firstly, this paper reviews two main methods for biochar synthesis, namely conventional pyrolysis and hydrothermal carbonization (HTC). The related processes are described, and the influences of biomass nature and reaction conditions, especially temperature, are discussed. Compared to pyrolysis, HTC has advantages for processing high-moisture biomass and producing spherical biochar particles. Secondly, typical features of biochar in comparison with other carbonaceous materials are summarized. They refer to the presence of inorganics, surface functional groups, and local crystalline structures made up of highly conjugated aromatic sheets. Thirdly, various strategies for biochar modification are illustrated. They include activation, surface functionalization, in situ heteroatom doping, and the formation of composites with other materials. An appropriate modification is necessary for biochar used as a catalyst. Fourthly, the applications of biochar-based catalysts in three important processes of biofuel production are reviewed. Sulfonated biochar shows good catalytic performance for biomass hydrolysis and biodiesel production. Biodiesel production can also be catalyzed by biochar-derived or -supported solid-alkali catalysts. Biochar alone and biochar-supported metals are potential catalysts for tar reduction during or after biomass gasification. Lastly, the merits of biochar-based catalysts are summarized. Biochar-based catalysts have great developmental prospects. Future work needs to focus on the study of mechanism and process design.

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Section: Introductionmentioning

confidence: 99%

Preparation and Application of Biochar-Based Catalysts for Biofuel Production

Cheng

2018

Catalysts

200

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“…FFAs are cytotoxic at higher concentrations and when detected at high levels in microbial biomass are usually the products of lipase-catalyzed acylglycerol hydrolysis. The content of FFAs in microbial biomass has been shown to increase after harvesting due to the enzymatic hydrolysis of lipids [21,52] and, therefore, elevated content of FFA might be expected in microbial biomass during storage [15,53].…”

Section: Lipid Composition and Distributionmentioning

confidence: 99%

“…[108] compared to other methods, such as autoclaving, bead milling, sonication and osmotic shock. However, Yu et al (2015) showed controversial results, indicating that microwave treatment was only slightly better than autoclaving, but remarkably inferior to other methods, such as sonication, bead milling and acid hydrolysis [142]. Balasubramanian et al (2011) processed Scenedesmus obliquus biomass in a continuous microwave and showed a 77% of total oil recovery using a subsequent hexane extraction [130].…”

Section: Microwavesmentioning

confidence: 99%

Lipid recovery from wet oleaginous microbial biomass for biofuel production: A critical review

et al. 2016

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h i g h l i g h t sChallenges in industrial lipid extraction processes were illustrated. Lipid recovery from wet biomass was critically reviewed in the context of biofuel productions. Cell wall disruption technologies were critically reviewed and compared. a b s t r a c tBiological lipids derived from oleaginous microorganisms are promising precursors for renewable biofuel productions. Direct lipid extraction from wet cell-biomass is favored because it eliminates the need for costly dehydration. However, the development of a practical and scalable process for extracting lipids from wet cell-biomass is far from ready to be commercialized, instead, requiring intensive research and development to understand the lipid accessibility, mechanisms in mass transfer and establish robust lipid extraction approaches that are practical for industrial applications. This paper aims to present a critical review on lipid recovery in the context of biofuel productions with special attention to cell disruption and lipid mass transfer to support extraction from wet biomass.

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“…The organic solvent was vacuum-evaporated to obtain the microalgal oil. Chlorophyll in N. salina oil was removed by adding 1% (v/v) of phosphoric acid and heated at 100 ˚C under a vacuum for 30 min 16 . The oil was separated from the dark green chlorophyll floccules, resulting in a refined N. salina oil.…”

Section: Microalgal Oil Extraction and Processingmentioning

confidence: 99%

Selective esterification to produce microalgal biodiesel and enrich polyunsaturated fatty acid using zeolite as a catalyst

Dong

Miao

et al. 2015

RSC Adv.

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Microalgae can be both a promising biofuel feedstock and a source of polyunsaturated fatty acids (PUFA). This paper reports a novel integrated process that simultaneously produces biodiesel and enriches PUFA. It was accomplished by using zeolite as a selective catalyst that preferentially converts shorter-chain fatty acids (SCFA) into fatty acid methyl esters (FAME) (86% conversion for S. limacinum and 65% conversion for N. salina) and enriches high-value PUFA (70% for S. limacinum and 78% for N. salina) in the unreacted free fatty acid (FFA) stream. The esterification reaction rate was affected by acid strength and pore size, while the selectivity of zeolite increased as pore size of zeolite decreased. This approach allows production of high quality biodiesel and efficient PUFA enrichment. The unreacted PUFA can be further refined for nutraceutical or other applications to improve economic viability of microalgal biodiesel production.

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Two-step microalgal biodiesel production using acidic catalyst generated from pyrolysis-derived bio-char

Cited by 98 publications

References 38 publications

Preparation and Application of Biochar-Based Catalysts for Biofuel Production

Preparation and Application of Biochar-Based Catalysts for Biofuel Production

Lipid recovery from wet oleaginous microbial biomass for biofuel production: A critical review

Selective esterification to produce microalgal biodiesel and enrich polyunsaturated fatty acid using zeolite as a catalyst

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