Catalytic transfer hydrogenation and characterization of flash hydrolyzed microalgae into hydrocarbon fuels production (jet fuel)

Asiedu, Alexander; Davis, Ryan W.; Kumar, Sandeep

doi:10.1016/j.fuel.2019.116440

Cited by 22 publications

(5 citation statements)

References 80 publications

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“…H1 represents materials with a porous structure that have spherical or cylindrical porous channels. H3 also represents materials with a soft and plate-like structure and porous slits[44,45].Based on the Barrett-Joyner-Halenda (BJH) diagram inFig. 6, the structure of all samples contains micropores, mesopores, and macropores.…”

mentioning

confidence: 99%

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

Salehi

Naziri

2021

Preprint

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Background:A novel biosorbent based on defatted Chlorella vulgaris (DCV) as a by-product of the biofuel industry was considered as an economical and inexpensive biosorbent in the form of magnetic modified defatted Chlorella vulgaris (MDCV/Fe3O4) for methylene blue (MB) removal. The lipid extraction was performed on raw Chlorella vulgaris (RCV). Phosphoric acid was selected as a DCV modifier. During acid modification, the variables affecting the biosorption capacity and the residual algae such as temperature (30-70 ), the contact time of DCV with acid (3-9 hr), the concentration of acid (2-6 mol/L), and the ratio of acid volume to DCV (30-70 mL/g) were investigated and optimized using Minitab-18 software. The modified defatted Chlorella vulgaris (MDCV) was prepared by acidification of DCV under optimal conditions. MDCV/ was prepared using the co-precipitation method for easy and low-cost separation of biosorbent. The XRD, FTIR, SEM, EDS, BET, and VSM analyses were performed to identify the structures and characteristics of RCV, DCV, MDCV, and MDCV/. Some experimentsere designed using Minitab-18 software to investigate the effects of temperature (5-45 ), contact time (30-90 min), biosorbent dosage (15-45 mg), initial concentration of MB (20-100 mg/L), and pH (5-9) on the biosorption capacity of MDCV/. The kinetic, isothermal and thermodynamic parameters were investigated on MDCV/.Results:The specific surface area of MDCV/ was 25.20 . RCV, DCV, and MDCV/ had a crystalline structure and MDCV had an amorphous structure. The data were most consistent with Pseudo-second-order and Freundlich models. The maximum biosorption capacity of MDCV/ was calculated in the amount of 32.44‌ mg/g. According to the positive values of and negative values of (-46.56 kJ/mol) and (-0.17 kJ/mol.K), the biosorption of MB on MDCV/ was non-spontaneous, exothermic with a decrease in irregularity.Conclusions:In this study, MDCV/ was applied as the MB biosorbent. Modifications such as lipid extraction, phosphoric acid modification and magnetization improved this biosorbent in its biosorption capacity and separation. Data were optimized in the acid modification and MB biosorption steps. Comparison of the characteristics of MDCV/ with unmodified species confirmed its high efficiency. Kinetic, isothermal and thermodynamic studies were also performed.

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mentioning

confidence: 99%

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

Salehi

Naziri

2021

Preprint

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“…It can be seen that at temperatures below 200 • C, weight loss of approximately 7% and 12% was observed in the TG thermogram for both the fresh and used catalysts, respectively, which could have been due to the loss of loosely bonded water. From 200 to 400 • C, weight loss values of approximately 2% and 3% for the fresh and used catalysts were recorded, and this weight loss is associated with the strongly bonded water [65]. In the case of the fresh catalyst, further weight loss was not observed.…”

Section: Thermogravimetric Analysis (Tga) Of Fresh and Used Catalystmentioning

confidence: 96%

Nanosized Silica-Supported 12-Tungstophosphoric Acid: A Highly Active and Stable Catalyst for the Alkylation of p-Cresol with tert-Butanol

Alharbi,

Roselin

et al. 2023

Catalysts

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12-Tungstophosphoric acid supported on nanosilica (TPA/SiO2) was employed as a catalyst for the tertiary butylation of p-cresol using tertiary butanol as an alkylating agent. The TPA/SiO2 catalyst was synthesized using the wet impregnation method followed by steaming at 150 °C for 6 h. The catalysts were characterized by means of X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) analysis. The surface acidity of the untreated and steamed catalysts was characterized via FTIR and DSC thermal analysis using pyridine as a probe molecule. The fresh and spent catalysts were characterized via TGA analysis. The catalytic activity studies showed that the steamed catalyst displayed higher activity, with a higher desired yield of 2-tert-butyl cresol (2-TBC) compared to the untreated catalyst, and that this activity was related to the presence of stronger Brønsted acid sites in the steamed catalyst. A detailed analysis of the TPA/SiO2 steamed catalyst was performed to study the effects of reactant time-on-stream, reactant feed rate, reaction temperature, and the molar ratio of tert-butanol to p-cresol. The optimum reaction temperature, tert-butanol/p-cresol molar ratio, feed rate, and time-on-stream were 413 K, a molar ratio of 2:1, 6 mL/min, and 2 h, respectively. The present study demonstrates that the TPA/SiO2 catalyst exhibits high activity in terms of % conversion and high % selectivity of 2-TBC under the optimized conditions. The characterization of fresh and spent catalysts confirmed the occurrence of coke deposition after the catalytic reaction. The catalyst was regenerated via heat treatment at 400 °C for 5 h. The regenerated catalyst was reused for subsequent runs for three cycles without showing a loss in its activity.

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“…Selectivity towards reaction type and the extent of each reaction depend on the catalyst properties and reaction conditions [132,133]. It is noted that hydrodeoxygenation requires excess hydrogen [134]. The high cost associated with it hinders the application of this process [135].…”

Section: General Reaction Mechanismmentioning

confidence: 99%

Drop-in biofuels production from microalgae to hydrocarbons: Microalgal cultivation and harvesting, conversion pathways, economics and prospects for aviation

Martinez-Villarreal

Breitenstein

Nimmegeers

et al. 2022

Biomass and Bioenergy

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Catalytic transfer hydrogenation and characterization of flash hydrolyzed microalgae into hydrocarbon fuels production (jet fuel)

Cited by 22 publications

References 80 publications

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

Nanosized Silica-Supported 12-Tungstophosphoric Acid: A Highly Active and Stable Catalyst for the Alkylation of p-Cresol with tert-Butanol

Drop-in biofuels production from microalgae to hydrocarbons: Microalgal cultivation and harvesting, conversion pathways, economics and prospects for aviation

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Catalytic transfer hydrogenation and characterization of flash hydrolyzed microalgae into hydrocarbon fuels production (jet fuel)

Cited by 22 publications

References 80 publications

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4)&nbsp;as a Novel Biosorbent for Methylene Blue Removal

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4)&nbsp;as a Novel Biosorbent for Methylene Blue Removal

Nanosized Silica-Supported 12-Tungstophosphoric Acid: A Highly Active and Stable Catalyst for the Alkylation of p-Cresol with tert-Butanol

Drop-in biofuels production from microalgae to hydrocarbons: Microalgal cultivation and harvesting, conversion pathways, economics and prospects for aviation

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Product

Resources

About

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal