Study of catalytic hydrodeoxygenation performance for the Ni/KIT-6 catalysts

Chen, Shuang; Pan, Xueyuan; Miao, Caixia; Xie, Hongmei; Zhou, Guilin; Jiao, Zhaojie; Zhang, Xianming

doi:10.1016/j.jscs.2017.11.002

Cited by 28 publications

(38 citation statements)

References 37 publications

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“…The XRD results are also confirmed that the NiO species can be effectively reduced by H 2 at 450 • C for 2.0 h to form metallic Ni. This result is consistent with the previous H 2 -TPR results and previous reports [24,30]. However, there may still be some amorphous NiO or/and NiSiO 3 species, which formed at high-temperature calcination.…”

Section: Xrd Characterizationsupporting

confidence: 93%

“…In contrast, the chemisorbed hydrogen species are difficult to remove at room temperature by Ar purge because of the formation of a chemical bond between chemisorbed hydrogen species and metallic Ni active center. Therefore, the α and β hydrogen desorption regions formed by the catalysts can be attributed to the desorption of surface chemisorbed hydrogen species and metal hydride [24,32]. As is well known, the chemisorbed hydrogen species can also be effectively desorbed to form the reactive hydrogen species, which is required for the reaction by increasing the system temperature.…”

Section: H 2 -Tpd Studiesmentioning

confidence: 94%

“…By contrary, at high reduction temperature, the effect of H 2 flow is not enough to prevent the high temperature sintering of metallic Ni, which reduces the dispersion and increases the crystal size. The reduction rate of NiO species is accelerated when the reduction temperature is too high, so that the formed metallic Ni particles with high surface energy can overcome the limitation of the support structure and migrate to the surface of the support [24]. At this time, the metallic Ni exists on the support surface with supersaturated state; unfortunately, the crystal size increases gradually [29].…”

Section: Xrd Characterizationmentioning

confidence: 99%

“…The reduction temperature can only change the chemical state and crystal size of Ni species; fortunately, it cannot change the structure of KIT-6 support. Therefore, the pore structure can maintain the pore size distribution and pore volume because of its confinement and attachment effects [24]. The slight changes of average pore diameter and total pore volume are mainly due to the growth of metal Ni crystal in the pore structure.…”

Section: Bet Characteristicsmentioning

confidence: 99%

“…Therefore, replacing traditional support with mesoporous silicon-based material is a good method to solve the above problems we have met at the moment. At the same time, the use of ethyl acetate as a model compound can even effectively eliminate the influence of long chain alkyl structures over the studied catalytic HDO performance, thus obtaining more accurate information on HDO of oxygen containing functional groups [24,25]. As we all know, the reduction temperature can affect the valence state of the variable valence transition metal species, then influence the activation ability of the corresponding catalysts for oxygen containing functional groups in the ester molecules and H 2 molecules in the reaction system.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

et al. 2019

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A series of Ni/KIT6 catalyst precursors with 25 wt.% Ni loading amount were reduced in H 2 at 400, 450, 500, and 550 • C, respectively. The studied catalysts were investigated by XRD, Quasi in-situ XPS, BET, TEM, and H 2 -TPD/Ranalysis methods. It was found that reduction temperature is an important factor affecting the hydrodeoxygenation (HDO) performance of the studied catalysts because of the Strong Metal Support Interaction Effect (SMSI). The reduction temperature influences mainly the content of active components, crystal size, and the abilityfor adsorbing and activating H 2 . The developed pore structure and large specific surface area of the KIT-6 support favored the Ni dispersion. The RT450 catalyst, which was prepared in H 2 atmosphere at 450 • C, has the best HDO performance. Ethyl acetate can be completely transformed and maintain 96.8% ethane selectivity and 3.2% methane selectivity at 300 • C. The calculated apparent activation energies of the prepared catalysts increased in the following order: RT550 > RT400 > RT500 > RT450.

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Section: Xrd Characterizationsupporting

confidence: 93%

Section: H 2 -Tpd Studiesmentioning

confidence: 94%

Section: Xrd Characterizationmentioning

confidence: 99%

Section: Bet Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

et al. 2019

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Hydrogen Production from Formic Acid Using KIT‐6 Supported Non‐Noble Metal‐Based Catalysts

Eslek Koyuncu,

Tug,

Oktar

et al. 2024

ChemPlusChem

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The aim of this study is to investigate the activity of KIT‐6 supported nickel (Ni) and cobalt (Co) catalysts, and the effect of Co incorporation to the Ni@KIT‐6 catalyst in the formic acid (FA) dehydrogenation. Ni and Co are inexpensive and readily available non‐noble transition metals that are considered ideal for dehydrogenation reactions due to their high activity against C‐C and C‐H bond breaking. In this study, KIT‐6 supported catalysts were tested for hydrogen production from FA in a conventionally heated packed‐bed continuous‐flow system. N2 adsorption‐desorption isotherms of the samples were found to be consistent with Type‐IV according to the International Union of Pure and Applied Chemistry (IUPAC) classification. The introduction of metal loading resulted in the preservation of the mesoporous structure of the support material. X‐ray diffraction (XRD) patterns of the catalysts exhibited the characteristic amorphous silica structure. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFT) analysis, Lewis acidity of Co‐based catalysts was found to be higher than the Ni‐based catalysts. The complete formic acid conversion was observed at 200‐350 °C. The highest H2 selectivity was obtained with the 3Ni@KIT‐6 catalyst. The Co‐based catalysts exhibited relatively lower catalytic activity, which was linked to increased coke formation within these catalysts.

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Sulfur‐Free Bimetallic Ni_x‐Fe_y/γ‐Al₂O₃ Catalysts for the Hydrodeoxygenation of Methyl Laurate to Biofuel

et al. 2022

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The Ni/γ‐Al2O3, Nix‐Fey/γ‐Al2O3 and Fe/γ‐Al2O3 catalysts are prepared by impregnation method, and the influence of nNi/nFe on the performances of the prepared catalysts for the methyl laurate hydrodeoxidation (HDO) was evaluated. The prepared catalysts and precursors were characterized by BET, H2‐TPR, XRD, and H2‐TPD, which confirmed the existence of NiFe alloy is advantageous to improve the catalytic activity, and the synergistic effect between Ni and Fe was elucidated. The catalytic properties of the studied Nix‐Fey/γ‐Al2O3 catalysts with low Fe content was significantly worse than that of monocomponent Ni/γ‐Al2O3 catalyst, due to the migration and agglomeration of highly dispersed Ni0 species on the corresponding catalyst surface. The introduction of Fe species had significant influence on the HDO performances and product selectivity of the Ni‐based catalyst. The higher Fe content can promote the main reaction path from hydrodecarbonylation/hydrodecarboxylation to hydrodeoxygenation, which results in the high C12 alkane selectivity on the corresponding catalysts and inhibits the cracking reaction. The bimetallic Ni3‐Fe7/γ‐Al2O3 catalyst had the best methyl laurate hydrogenation performances. The conversion of methyl laurate was 93.3 % and the selectivity of alkane compounds could reach 90 % on the Ni3‐Fe7/γ‐Al2O3 catalyst at the reaction temperature of 340 °C.

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Study of catalytic hydrodeoxygenation performance for the Ni/KIT-6 catalysts

Cited by 28 publications

References 37 publications

Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Hydrogen Production from Formic Acid Using KIT‐6 Supported Non‐Noble Metal‐Based Catalysts

Sulfur‐Free Bimetallic Ni_x‐Fe_y/γ‐Al₂O₃ Catalysts for the Hydrodeoxygenation of Methyl Laurate to Biofuel

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Study of catalytic hydrodeoxygenation performance for the Ni/KIT-6 catalysts

Cited by 28 publications

References 37 publications

Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Hydrogen Production from Formic Acid Using KIT‐6 Supported Non‐Noble Metal‐Based Catalysts

Sulfur‐Free Bimetallic Nix‐Fey/γ‐Al2O3 Catalysts for the Hydrodeoxygenation of Methyl Laurate to Biofuel

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Sulfur‐Free Bimetallic Ni_x‐Fe_y/γ‐Al₂O₃ Catalysts for the Hydrodeoxygenation of Methyl Laurate to Biofuel