Catalytic hydrodeoxygenation of rubber seed oil over sonochemically synthesized Ni-Mo/γ-Al2O3 catalyst for green diesel production

Ameen, Mariam; Azizan, Mohammad Tazli; Ramli, Anita; Yusup, Suzana; Alnarabiji, Mohamad Sahban

doi:10.1016/j.ultsonch.2018.10.011

Cited by 82 publications

(66 citation statements)

References 57 publications

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“…The Mo 3d spectra (Figure b) are decomposed according to the literature, the binding energies at 228.29 eV and 231.49 eV are ascribed to the 3d5/2 and 3d3/2 levels of Mo (Mo 0 ), and those at 229.27 eV and 234.00 eV are associated with the MoO 2 (Mo 4+ ), which is in accordance with the XRD result (Figure ). Moreover, we believe that Mo 4+ is more favorable to HDO reaction than Mo 0 , which is consistent with the research of others ,. Mariam Ameen et al.…”

Section: Resultssupporting

confidence: 93%

Hydrodeoxygenation of Octanoic Acid over Supported Ni and Mo Catalysts: Effect of Ni/Mo Ratio and Catalyst Recycling

et al. 2019

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Hydrodeoxygenation of octanoic acid over supported NiMo bimetallic catalysts was investigated as a representative of carboxylic acid compounds in bio‐oils. A series of MCM‐41supported Ni and Mo bimetal catalysts were prepared with the wetness impregnation method. The microstructural and physicochemical properties of the fresh and recovered bimetal catalysts were characterized by various methods such as X‐ray diffraction (XRD), Scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS), etc.. The results show that the bulk NiO particles were well‐uniformly dispersed on the surface of the bimetal catalyst, and Mo4+ was founded as the main valence of Mo inside solid. Under the optimal conditions, i. e. the reaction temperature of 270 °C, reaction pressure of 3 MPa, and reaction time of 7 h, the 3Ni7Mo/MCM‐41 sample exhibits selectivity to octane 72.6% with a high conversion of octanoic acid 96.1%. Only a slight decrease in catalytic activity was observed after reused for three times. Moreover, the recovered sample was easily regenerated only with simple calcination and deoxidization, but has the similar microstructure compared with the fresh one.

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Section: Resultssupporting

confidence: 93%

Hydrodeoxygenation of Octanoic Acid over Supported Ni and Mo Catalysts: Effect of Ni/Mo Ratio and Catalyst Recycling

et al. 2019

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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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“…Extensive studies have been conducted to improve the catalytic activity and durability of Ni-based catalysts under similar reaction conditions. [16,17] Due to the unique properties of Ni catalyst, a wide range of catalytic applications have been reported in the literature, such as hydrodeoxygenation, [18] methanation reaction, [19] and methane reforming reactions. [20,21] In TCD reaction, Ni has a high reactivity in facilitating methane decomposition at a temperature as low as 773 K. Besides, the catalytic activity of Ni-based catalysts was found to be improved significantly upon diluting Ni with other metals in forming bimetallic catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterisation, and Performance Evaluation of Promoted Ni‐Based Catalysts for Thermocatalytic Decomposition of Methane

et al. 2020

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Thermocatalyatic decomposition (TCD) of methane to CO X free hydrogen and carbon nanofibre (CNF) was investigated over a series of self-designed monometallic Ni catalyst and bimetallic NiÀ Cu and NiÀ Pd catalysts. The catalysts were synthesised from the wet impregnation method and characterised using a series of complementary techniques include TGA, XRD, BET, TPR, FESEM, TEM, and Raman Spectroscopy. Despite a substantial reduction of surface area in the promoted catalysts, the catalytic activity of the promoted catalyst was enhanced due to the nature of the process which is a metal-catalysed reaction. As a whole, bimetallic PdÀ Ni catalyst with a surface area of 2.76 m 2 g À 1 possesed the highest conversion of 77 % after 6 h reaction. The overall TCD reaction was found to be first-order with the calculated activation energy, E a of 38 kJ mol À 1. The methane consumption rates at 1023 K and 1073 K were 0.5 mol s À 1 g cat À 1 and 0.58 × 10 4 mol s À 1 g cat À 1 respectively. Meanwhile, the methane consumption rates improved considerably from 0.58 mol s À 1 g cat À 1 to 0.67 × 10 4 mol s À 1 g cat À 1 under the methane partial pressure of 41 kPa. The XRD profile of the fresh catalysts revealed that mixed oxides were formed over the surface of the support upon the addition of Cu and Pd to 50 % Ni/Al 2 O 3. Moreover, the formation of carbon nanofibers followed both tip and base growth mechanisms as evident from the TEM images. Larger and wider carbon fibres were found in the Pd promoted catalyst.

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Catalytic hydrodeoxygenation of rubber seed oil over sonochemically synthesized Ni-Mo/γ-Al2O3 catalyst for green diesel production

Cited by 82 publications

References 57 publications

Hydrodeoxygenation of Octanoic Acid over Supported Ni and Mo Catalysts: Effect of Ni/Mo Ratio and Catalyst Recycling

Hydrodeoxygenation of Octanoic Acid over Supported Ni and Mo Catalysts: Effect of Ni/Mo Ratio and Catalyst Recycling

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

Synthesis, Characterisation, and Performance Evaluation of Promoted Ni‐Based Catalysts for Thermocatalytic Decomposition of Methane

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