Highly stable and selective catalytic deoxygenation of renewable bio-lipids over Ni/CeO2-Al2O3 for N-alkanes

Fu, Lin; Li, Yongfei; Cui, Huamin; Ba, Wenxia; Liu, Yuejin

doi:10.1016/j.apcata.2021.118258

Cited by 19 publications

(5 citation statements)

References 72 publications

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“…Authors have categorized the different interactions between nickel and the support into three TPR signal sections [44,46] as follows:…”

Section: H 2 Temperature Programmed Reduction and H 2 -Pulse Chemisor...mentioning

confidence: 99%

Conversion of Biomass-Derived Tars in a Fluidized Catalytic Post-Gasification Process

Rojas Chaves,

Torres Brauer,

Torres

et al. 2024

Catalysts

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The present study deals with the development, characterization, and performance of a Ni-based catalyst over a ceria-doped alumina support as a post-gasification step, in the conversion of biomass-derived tars. The catalysts were prepared using the incipient wetness technique and characterized chemically and physically using NH3-TPD, CO2-TPD, H2-TPR, XRD, Pyridine-FTIR, N2 physisorption, and H2-Pulse Chemisorption. It was observed that the 5 wt% CeO2 reduced the strong and very strong acid sites of the alumina support and helped with the dispersion of nickel. It was noticed that the nickel crystallite sizes and metal dispersion remained unchanged as the nickel loading increased. The performance of the catalysts was studied in a mini-fluidized CREC Riser Simulator at different temperatures and reaction times. The selected tar surrogate was 2-methoxy-4-methylphenol, given its functional group similarities with lignin-derived tars. A H2/CO2 gas blend was used to emulate the syngas at post-gasification conditions. The obtained tar surrogate conversion was higher than 75%, regardless of the reaction conditions. Furthermore, the catalysts used in this research provided an enhancement in the syngas product composition when compared to that observed in the thermal experiments. The presence of hydrocarbons greater than CH4 (C1+) was reduced at 525 °C, from 96 ± 3% with no catalyst, to 85 ± 2% with catalyst and steam, to 68 ± 4% with catalyst and steam-H2/CO2. Thus, the catalyst that we developed promoted tar cracking, tar reforming, and water-gas shift reactions, with a H2/CO ratio higher than 3.8, providing a syngas suitable for alcohol synthesis.

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“…Authors have categorized the different interactions between nickel and the support into three TPR signal sections [44,46] as follows:…”

Section: H 2 Temperature Programmed Reduction and H 2 -Pulse Chemisor...mentioning

confidence: 99%

Conversion of Biomass-Derived Tars in a Fluidized Catalytic Post-Gasification Process

Rojas Chaves,

Torres Brauer,

Torres

et al. 2024

Catalysts

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“…95 The enhanced conversion due to hydrogen pressure can be observed in other studies. 67,[96][97][98] Aside from conversion, hydrogen pressure also regulates the reaction pathway. Under rich hydrogen environment, hydrodeoxygenation takes place predominantly.…”

Section: Influence Of Pressurementioning

confidence: 99%

Selectivity of reaction pathways for green diesel production towards biojet fuel applications

et al. 2023

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“…In turn, the formation of 9-octadecenal was promoted by oleic acid reduction (Equation ( 7)) through a mechanism that includes the chemisorption of carbonyl oxygen at the Lewis acid sites of alumina (Al2O3), present on the catalyst surface [72,79]. Decarbonylation reactions of aldehydes, such as 9-octadecenal (Equation ( 8)), were another possible route for hydrocarbon generation [80]. As the aldehydes formed in the catalytic pyrolysis reactions were mostly C6-C9, the occurrence of C-C cracking reactions of the alkyl chains was presumed (Equation ( 9)).…”

Section: Reaction Pathwaysmentioning

confidence: 99%

“…As the aldehydes formed in the catalytic pyrolysis reactions were mostly C6-C9, the occurrence of C-C cracking reactions of the alkyl chains was presumed (Equation ( 9)). Part of the aldehydes formed also underwent hydrogenation reactions, forming alcohols (Equation ( 10)) [80]. Due to the reaction conditions, Endogenous hydrogen, from the dehydrogenation and aromatization reactions, was used in hydrogenation reactions [39,73], promoting greater formation of alkanes (Equation ( 6)).…”

Section: Reaction Pathwaysmentioning

confidence: 99%

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Hydrogen-Free Deoxygenation of Oleic Acid and Industrial Vegetable Oil Waste on CuNiAl Catalysts for Biofuel Production

Sabino,

Liborio,

Arias

et al. 2023

Energies

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The pyrolysis of vegetable oil waste is an alternative way to convert biomass into high-quality second-generation biofuels, with social, economic and environmental sustainability. The present work deals with the pyrolysis of oleic acid as a model compound and an industrial vegetable oil residue on CuNiAl mixed oxide catalysts, derived from layered double hydroxides. Reactions of the oils pre-adsorbed on the catalysts (catalyst:oil mass ratio of 5:1) were performed at 550 °C on a micro-pyrolysis system and the analyses of volatile products were carried out online using GC/MS. Copper addition to NiAl catalysts increased the cracking of oleic acid. Increasing copper content also decreased the formation of aromatics and coke precursors, as well as oxygenated compounds. The CuNiAl catalyst with a Cu/Ni ratio of 0.4 showed strong catalytic activity in the conversion of an industrial vegetable oil residue with a high volume of free fatty acids produced. Compared to the non-catalytic reaction, the catalyst reduced the content of oxygenates and increased the content of hydrocarbons, particularly in the gasoline range (C5–C9). The CuNiAl oxide catalyst was able to convert vegetable oil residues into hydrocarbons in the range of gasoline, kerosene and diesel, and also linear alkylbenzenes as chemical precursors for surfactant production.

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Highly stable and selective catalytic deoxygenation of renewable bio-lipids over Ni/CeO2-Al2O3 for N-alkanes

Cited by 19 publications

References 72 publications

Conversion of Biomass-Derived Tars in a Fluidized Catalytic Post-Gasification Process

Conversion of Biomass-Derived Tars in a Fluidized Catalytic Post-Gasification Process

Selectivity of reaction pathways for green diesel production towards biojet fuel applications

Hydrogen-Free Deoxygenation of Oleic Acid and Industrial Vegetable Oil Waste on CuNiAl Catalysts for Biofuel Production

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