Effects of a forming process on the properties and structure of RANEY®-Ni catalysts for the hydrogenation of 1,4-butenediol

Gao, Xianlong; Mo, Wen‐Long; Ma, Fengyun; Tsubaki, Noritatsu; Wang, Hongli; Fan, Xing

doi:10.1039/c9ra10200k

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…e catalyst employed in the study is a granular sponge nickel type. Previous studies on the hydrogenation mechanism on Raney Ni found that catalyst activity is proportional to active Ni sites (Mikkola et al, 2000;Gao et al, 2020). Hence, in this study, hydrogenation presumably happens on the catalyst surface, speci cally on active nickel sites.…”

Section: E Ect Of Ni Catalyst and Feed Concentrationmentioning

confidence: 55%

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Gubatanga

Sawai

Nunoura

2021

J. Chem. Eng. Japan / JCEJ

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In this work, a new approach towards converting high lipid content biomass into renewable hydrogen is investigated. Using canola oil as the representative biomass, hydrogen was obtained by employing supercritical water as a reaction medium in a continuous gasi cation system over nickel catalyst. The experiments were conducted at xed temperature (400°C), pressure (25 MPa), reaction time (residence time 45 s, or weight hourly space velocity 25.5 h 1 for catalytic reaction) and varying feed concentrations (2-5 wt%). The results of the study revealed that increasing the feed concentration had a negative e ect on hydrogen yield due to less water molecules present in the reactant. Another interesting observation is the appearance of a solid-like emulsion, composed of products from polymerization reaction. The appearance of this emulsion is strongly correlated to the decline of catalyst activity. Further characterization of the nickel catalyst used after the reaction found a signi cant decrease of its surface area. Moreover, deposition of carbonaceous compounds on its surface was detected, which could have inhibited the catalytic activity.

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Section: E Ect Of Ni Catalyst and Feed Concentrationmentioning

confidence: 55%

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Gubatanga

Sawai

Nunoura

2021

J. Chem. Eng. Japan / JCEJ

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“…However, here the hydrogenation was performed at 70 °C. Nonetheless, a small amount of aluminum ( � 10 wt%) present in the catalyst may have acidic nature, [50] and thus it could catalyze the double bond activation while Ni could promote CÀ C hydrogenolysis. Interestingly, CÀ C hydrogenolysis was observed only for eugenol and could be thus linked to the presence of the double bond because hydrogenolysis was not detected in case of 4propylphenol hydrogenation.…”

Section: Effect Of the Methoxy Groupmentioning

confidence: 99%

Semi‐Batch Hydrotreatment of Lignin‐Derived Phenolic Compounds over Raney‐Ni with a Continuous Regeneration of the H‐Donor Solvent

Shumeiko

Kubička

2021

ChemSusChem

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Lignin can be converted into useful precursors of fuels and fine chemicals by thermochemical conversion followed by catalytic hydrogenation using metal catalysts at severe reaction conditions. Thus, mild hydrogenation would significantly improve the sustainability of lignin valorization. Here, hydrogenation of phenols, alkylphenols, and methoxyphenols was achieved at mild reaction conditions (70 °C and atmospheric pressure) via H-transfer hydrogenation over Raney-Ni catalyst in 2-propanol and 2-butanol solvents. The transfer hydrogenation was feasible at the mild conditions, but the complexity of the reactant greatly decreased or even completely suppressed its reactivity. The position of the functional group (o-, m-, p-position) had a great effect on the reactivity of phenols. Moreover, 2-butanol enhanced the conversion of phenols in comparison with 2propanol. When comparing classic hydrogenation with H-transfer hydrogenation in presence of external H 2 , it was found that external H 2 not only regenerated H-donor solvent and ensured stable performance but also increased conversion of phenols and alkylphenols. On the other hand, the absence of external H 2 boosted the conversion of methoxy phenols. Finally, phenols extracted from a pyrolysis oil aqueous phase were hydrogenated. The conversion of phenols was greatly affected by competitive adsorption of different compounds present in the reaction mixture. External H 2 promoted hydrogenation of the complex reaction mixture and prevented condensation of the reactive species in contrast to the H-transfer hydrogenation.

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“…7 To overcome the above obstacle, it is necessary to develop efficient catalysts, particularly economical catalysts such as Ni, which can ensure the fast and directional conversion of the BED intermediate to BDO. 6,8 Although the intrinsic hydrogenation activity of Ni is always inferior to that of precious metals (Pd, Pt, Ru, etc. ), it is believed that nano-Ni-catalysts can also exhibit a benign hydrogenation property via the modification of metal synergy, support features, or acidity and the metal−support interaction.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the above obstacle, it is necessary to develop efficient catalysts, particularly economical catalysts such as Ni, which can ensure the fast and directional conversion of the BED intermediate to BDO. , Although the intrinsic hydrogenation activity of Ni is always inferior to that of precious metals (Pd, Pt, Ru, etc. ), it is believed that nano-Ni-catalysts can also exhibit a benign hydrogenation property via the modification of metal synergy, support features, or acidity and the metal–support interaction. , Concerning the support effects on BYD hydrogenation, Rode et al investigated the effects of different supports including C, Al 2 O 3 , SiO 2 , and CaCO 3 on the enhancement in activity and selectivity of BYD hydrogenation, and they pointed out that different metal–support interactions significantly affected H 2 adsorption, leading to various hydrogenation performances and product distributions .…”

Section: Introductionmentioning

confidence: 99%

Effect of Pore Structures on 1,4-Butynediol Hydrogenation over Mesoporous Ni/Al₂O₃-SiO₂ Catalysts

Wang

Jiang

Bai

et al. 2021

Ind. Eng. Chem. Res.

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This work describes the 1,4-butynediol (BYD) hydrogenation to 1,4-butanediol (BDO) performance over supported Ni/Al2O3-SiO2 catalysts with different mesoporous structures (cross pore C-Ni/Al-SiO2, parallel pore P-Ni/Al-SiO2, and nonmesoporous structured N-Ni/Al-SiO2). To illustrate the pore structure effects on the catalyst texture, metal–support interaction, and surface acidity, the obtained catalysts were characterized using BET, inductively coupled plasma (ICP), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programed reduction (H2-TPR), and H2/NH3-temperature-programmed desorption (H2/NH3-TPD). Based on this, we proposed the structure–activity relationship between the pore structures and the hydrogenation performance. It was found that C-Ni/Al-SiO2 had short-range staggered and cross mesopores throughout the support, which can provide a larger surface area and pore volume for the fixation of highly dispersed active sites, thus enhancing the H2 activation ability. On the other hand, the cross channels have rich hole loops and surface defects for exposing assistant acid sites that are beneficial for the 1,4-butynediol (BYD) adsorption/activation, thus promising a superior hydrogenation ability. However, the narrow and long parallel pore structure of P-Ni/Al-SiO2 may limit the rapid diffusion of long-carbon-chain BYD in the pores, thus partially decreasing the accessibility of active sites and the catalytic activity. As for N-Ni/Al-SiO2, which has no mesoporous structure, its nickel particles are prone to aggregate seriously on the support surface, which weakens the interaction with the support and is not conducive to catalytic hydrogenation.

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Effects of a forming process on the properties and structure of RANEY®-Ni catalysts for the hydrogenation of 1,4-butenediol

Abstract: Xianlong Gao's paper focuses on the effects of a forming process on the catalytic hydrogenation of 1,4-butenediol (BED) to produce 1,4-butanediol (BDO). The evaluation results showed that the RNAA catalyst showed excellent hydrogenation performance.

Cited by 5 publications

References 39 publications

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Semi‐Batch Hydrotreatment of Lignin‐Derived Phenolic Compounds over Raney‐Ni with a Continuous Regeneration of the H‐Donor Solvent

Effect of Pore Structures on 1,4-Butynediol Hydrogenation over Mesoporous Ni/Al₂O₃-SiO₂ Catalysts

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Effects of a forming process on the properties and structure of RANEY®-Ni catalysts for the hydrogenation of 1,4-butenediol

Abstract: Xianlong Gao's paper focuses on the effects of a forming process on the catalytic hydrogenation of 1,4-butenediol (BED) to produce 1,4-butanediol (BDO). The evaluation results showed that the RNAA catalyst showed excellent hydrogenation performance.

Cited by 5 publications

References 39 publications

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Supercritical Water Gasification as Treatment for High Lipid Content Biomass in the Presence of Nickel Catalyst

Semi‐Batch Hydrotreatment of Lignin‐Derived Phenolic Compounds over Raney‐Ni with a Continuous Regeneration of the H‐Donor Solvent

Effect of Pore Structures on 1,4-Butynediol Hydrogenation over Mesoporous Ni/Al2O3-SiO2 Catalysts

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Effect of Pore Structures on 1,4-Butynediol Hydrogenation over Mesoporous Ni/Al₂O₃-SiO₂ Catalysts