Study of catalytic hydrodeoxygenation performance of Ni catalysts: Effects of prepared method

Chen, Shuang; Miao, Caixia; Luo, Yan; Zhou, Guilin; Xiong, Kun; Jiao, Zhaojie; Zhang, Xianming

doi:10.1016/j.renene.2017.09.028

Cited by 56 publications

(33 citation statements)

References 29 publications

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“…The considerations discussed above led us to conclude that the set of reactions included in the schemes of ester conversion differs significantly even for the same type of catalyst. Similar discrepancies in the HDO of esters are found in works performed using sulfide or metal‐based catalysts (Table S1).…”

Section: Introductionsupporting

confidence: 77%

Methyl palmitate hydrodeoxygenation over silica‐supported nickel phosphide catalysts in flow reactor: experimental and kinetic study

Shamanaev

Deliy

Aleksandrov

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The search for alternative sources of fuels is crucial for sustainable development now and in the near future. Biomass attracts much attention as an environmentally friendly, green and CO2‐neutral source of fuels. Hydrodeoxygenation (HDO) of fatty acid‐based feedstocks such as nonedible vegetable oil, waste cooking oil and animal fat is a versatile technology for producing efficient fuels. HDO schemes are often contradictory and have different numbers of stages. In the work reported, a highly active nickel phosphide catalyst was obtained and methyl palmitate (MP) HDO kinetic modelling was carried out to elucidate the HDO reaction scheme. RESULTS The effect of reduction temperature (400–600 °C) on the catalytic properties of the catalyst in MP HDO was evaluated and the most active catalyst (after reduction at 450 °C) was used in the kinetic experiments. The experimental data were collected in a wide range of MP conversion. The reaction scheme of MP HDO was elucidated by means of mathematical modelling which was specified by successive consideration of the experimental results of HDO selectivities at low MP conversions (1–10%), additional experiments of alcohol HDO (dodecanol‐1 as an analogue for hexadecanol‐1) and analysis of gas‐phase products. CONCLUSIONS In accordance with the results obtained, both hydrolysis of MP and hydrogenolysis of C&bond;OCH3 bond should be considered for describing the conversion of MP to intermediate compounds. This finding could explain the synergetic effect of acid and metal centres, which has been reported in the literature on aliphatic ester HDO, and justify the higher activity of bifunctional catalysts in this reaction. © 2019 Society of Chemical Industry

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Section: Introductionsupporting

confidence: 77%

Methyl palmitate hydrodeoxygenation over silica‐supported nickel phosphide catalysts in flow reactor: experimental and kinetic study

Shamanaev

Deliy

Aleksandrov

et al. 2019

J of Chemical Tech & Biotech

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“…Zhang et al [6] found that nano-sized nickel ferrite (NiFe 2 O 4 ) could effectively destabilize LiBH 4 , liberating 10.75 wt. % of hydrogen at 89 • C. As mentioned above, the addition of Ni or nickel-based oxides into LiBH 4 was an efficient way to enhance its dehydrogenation kinetics [14].…”

Section: Introductionmentioning

confidence: 90%

Improved Dehydrogenation Performance of Li-B-N-H by Doped NiO

Sun

et al. 2018

Metals

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In order to improve the dehydrogenation properties of the Li-B-N-H system, a flower-like NiO was successfully synthesized using the hydrothermal method. The effect of the NiO on the dehydrogenation properties of the LiBH 4 -2LiNH 2 system was studied. The results showed that the dehydrogenation properties of the LiBH 4 -2LiMH 2 system were significantly enhanced by doping with NiO. The composite doped with 5 wt. % NiO exhibited optimal hydrogen storage properties. It released about 10.5 wt. % hydrogen below 300 • C, and the onset dehydrogenation temperature was only 90 • C, 110 • C lower than that of LiBH 4 -2LiNH 2 . The isothermal dehydrogenation experiment indicated that the LiBH 4 -2LiNH 2 -5 wt. % NiO composite released 8.8 wt. % hydrogen within 15 min at 150 • C. Structural analysis revealed that the as-prepared NiO was reduced to metallic Ni, which worked as an active catalytic species in the remainder of the dehydrogenation process. The Mass Spectrometer (MS) analyses showed that the doped NiO inhibited the content of NH 3 released in the process of the dehydrogenation of LiBH 4 -2LiNH 2 -NiO.

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“…Under the studied conditions, ethyl acetate may hydrolyze to produce two intermediate products: acetic acid and ethanol, which can be further deoxygenated to produce ethane [34]. Acetic acid can also react with metallic Ni to produce nickel acetate, and nickel acetate can be further hydrogenated to produce ethane and methane [24,25]. At the same time, the ethane molecules can be cracked to methane at a high reaction temperature [25].…”

Section: Catalytic Activity Testmentioning

confidence: 99%

“…Acetic acid can also react with metallic Ni to produce nickel acetate, and nickel acetate can be further hydrogenated to produce ethane and methane [24,25]. At the same time, the ethane molecules can be cracked to methane at a high reaction temperature [25]. In the ester HDO reaction, decarboxylation or decarboxylation can also happen to generate CO 2 /CO.…”

Section: Catalytic Activity Testmentioning

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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Study of catalytic hydrodeoxygenation performance of Ni catalysts: Effects of prepared method

Cited by 56 publications

References 29 publications

Methyl palmitate hydrodeoxygenation over silica‐supported nickel phosphide catalysts in flow reactor: experimental and kinetic study

Methyl palmitate hydrodeoxygenation over silica‐supported nickel phosphide catalysts in flow reactor: experimental and kinetic study

Improved Dehydrogenation Performance of Li-B-N-H by Doped NiO

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

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