Aqueous-phase reforming of bio-oil aqueous fraction over nickel-based catalysts

Arandia, Aitor; Coronado, Irene; Remiro, Aingeru; Gayubo, Ana G.; Reinikainen, Matti

doi:10.1016/j.ijhydene.2019.04.007

Cited by 43 publications

(22 citation statements)

References 63 publications

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“…This pH can be a consequence of the dissolved CO 2 and/or the presence of soluble oxygenated compounds generated in the APH reaction of glycerol [20,24]. Arandia et al [25] reported a significant metal leaching when the feedstock included acetic acid. Under these conditions, no effect on the deactivation catalyst is observed with the amount of metal leaching.…”

Section: Catalyst Stability and Reusability Studymentioning

confidence: 99%

Study of Ni/Al-Fe Catalyst Stability in the Aqueous Phase Hydrogenolysis of Glycerol

et al. 2020

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The present work studied the stability and reusability of Ni/Al-Fe catalyst in the aqueous phase hydrogenolysis of glycerol without external hydrogen addition. The catalyst based on 28 molar % of Ni with 3/1 molar ratio of Al/Fe was prepared through co-precipitation. This catalyst presented the best performance in our last study which compares several Ni/Al-Fe catalysts with different molar ratios of Al/Fe. To see the influence of the pressurized water on the physicochemical characteristics of Ni/Al-Fe catalyst, a test of up to 9 h has been carried out. Fresh and used catalysts were characterized by various techniques: X-ray Diffraction (XRD), N2-physisorption, field emission scanning electron microscopy (FESEM) and STEM. Glycerol conversion and carbon yield to gases and liquids did not vary significantly when compared at 3 h and 9 h. Furthermore, the morphology of the catalyst remains stable after continuous recycling under severe hydrothermal conditions. The nickel rich phase of the catalyst, which was determined by XRD and scanning transmission electron microscopy (STEM) techniques, showed a stable size after 9 h under reaction.

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Section: Catalyst Stability and Reusability Studymentioning

confidence: 99%

Study of Ni/Al-Fe Catalyst Stability in the Aqueous Phase Hydrogenolysis of Glycerol

et al. 2020

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“…Arandia et al [17] studied the aqueous phase reforming of representative model compounds of a bio-oil aqueous fraction, such as acetic acid, ethanol, acetol and catechol, as well as a mixture of all of them. They studied the influence of different nickel-based catalysts at 230 • C and 32 bar.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ni-Co/Al-Mg Catalyst Loading in the Continuous Aqueous Phase Reforming of the Bio-Oil Aqueous Fraction

et al. 2021

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The effect of catalyst loading in the Aqueous Phase Reforming (APR) of bio-oil aqueous fraction has been studied with a Ni-Co/Al-Mg coprecipitated catalyst. Because of the high content of water in the bio-oil aqueous fraction, APR could be a useful process to convert this fraction into valuable products. Experiments of APR with continuous feeding of aqueous solution of acetol, butanol and acetic acid as the only compound, together with a simulated and a real aqueous fraction of bio-oil, were carried out. Liquid products in the liquid effluent of the APR model compounds were quantified and the reaction pathways were revised. The increase of catalyst loading produced an increase of gas production and a gas with higher alkanes content. Acetol was the compound with the highest reactivity while the conversion of acetic acid was very low. The presence of acetic acid in the feed caused catalyst deactivation.

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“…Ni/MEC exhibited a catalytic activity similar to that of MEC without metal loading, which indicated that the monometallic Ni catalyst has low catalytic activity for the reforming of the aqueous phase derived from the HO of LDPE. In a previous study, Arandia et al [55] reported that acetic acid exhibited the lowest reactivity under APR conditions with Ni-based catalysts compared to those of ethanol and acetol. The H 2 yield and H 2 mole fraction obtained from the APR process catalyzed by the RuÀ Ni bimetallic catalyst increased with the addition of Ru metal, and monometallic Ru showed the highest catalytic activity for hydrogen production, which may be mainly associated with the efficient activation role of positively charged small Ru particles on the formation of H 2 from acetic acid and water.…”

Section: Resultsmentioning

confidence: 98%

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

Tian

Zhu

et al. 2021

ChemSusChem

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The thermal degradation and conversion of waste polyethylene (PE) using a two-step process including hydrothermal oxidation (HO) and aqueous phase reforming (APR) were investigated. The objective of this study was to achieve efficient disposal of waste PE and generate H 2 in a mild and green way. The effects of various HO conditions on both HO and APR processes were studied. A high H 2 O 2 concentration caused overoxidation of PE resulting in more CO 2 . Decreasing the H 2 O 2 concentration weakened the overoxidation. The process using diluted H 2 O 2 exhibited the highest selectivity for acetic acid among the produced carboxylic acids. When the HO temperature exceeded 200°C, there was an increase in the CO 2 yield during the HO process and a decrease in the H 2 yield during the APR process. In addition, the effects of various monometallic and bimetallic catalysts on the reforming of the aqueous phase from the HO of PE were discussed. The highest H 2 mole fraction (51.52 %) in gaseous products from the APR process was obtained with Ru/ mesoporous carbon. Nevertheless, RuÀ Ni exhibited a higher stability than the monometallic Ru catalyst.

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Aqueous-phase reforming of bio-oil aqueous fraction over nickel-based catalysts

Cited by 43 publications

References 63 publications

Study of Ni/Al-Fe Catalyst Stability in the Aqueous Phase Hydrogenolysis of Glycerol

Study of Ni/Al-Fe Catalyst Stability in the Aqueous Phase Hydrogenolysis of Glycerol

Influence of the Ni-Co/Al-Mg Catalyst Loading in the Continuous Aqueous Phase Reforming of the Bio-Oil Aqueous Fraction

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

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