Nickel catalysts supported on palygorskite for transformation of waste cooking oils into green diesel

Lycourghiotis, Sotiris; Kordouli, Eleana; Sygellou, Labrini; Bourikas, Kyriakos; Kordulis, Christos

doi:10.1016/j.apcatb.2019.118059

Cited by 55 publications

(31 citation statements)

References 51 publications

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“…It is shown that the HDO reaction using Ni/SZ is faster compared to Ni/AZ. Our results are in line with Lycourghiotis et al [34] and Ding et al [10], on higher conversion rates of waste cooking oil fatty acid with sulfur-free Ni-based catalysts. HDO activity and selectivity can be significant-ly influenced by catalyst support material.…”

Section: Hydrodeoxygenation Of Waste Cooking Oilsupporting

confidence: 93%

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

Sowe

Lestari

Novitasari

et al. 2021

Bull. Chem. React. Eng. Catal.

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Hydrodeoxygenation (HDO) is applied in fuel processing technology to convert bio-oils to green diesel with metal-based catalysts. The major challenges to this process are feedstock, catalyst preparation, and the production of oxygen-free diesel fuel. In this study, we aimed to synthesize Ni catalysts supported on silica-zirconia and alumina-zirconia binary oxides and evaluated their catalytic activity for waste cooking oil (WCO) hydrodeoxygenation to green diesel. Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 were synthesized by wet-impregnation and hydrodeoxygenation of WCO was done using a modified batch reactor. The catalysts were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS), and N2 isotherm adsorption-desorption analysis. Gas chromatography - mass spectrometry (GC-MS) analysis showed the formation of hydrocarbon framework n-C15 generated from the use of Ni/Al2O3-ZrO2 with the selectivity of 68.97% after a 2 h reaction. Prolonged reaction into 4 h, decreased the selectivity to 58.69%. Ni/SiO2-ZrO2 catalyst at 2 h showed selectivity of 55.39% to n-C15. Conversely, it was observed that the reaction for 4 h increased selectivity to 65.13%. Overall, Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 catalysts produced oxygen-free green diesel range (n-C14-C18) enriched with n-C15 hydrocarbon. Reaction time influenced the selectivity to n-C15 hydrocarbon. Both catalysts showed promising hydrodeoxygenation activity via the hydrodecarboxylation pathway. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: Hydrodeoxygenation Of Waste Cooking Oilsupporting

confidence: 93%

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

Sowe

Lestari

Novitasari

et al. 2021

Bull. Chem. React. Eng. Catal.

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“…However, the monotonous increase of Ni dispersion with the Cu content (Table 2) is not compatible with the volcano-like trend of catalytic performance and its maximization over the catalyst with the medium Cu content It is seen that the content of the reaction mixture in hydrocarbons with an odd number of carbon atoms (n-C15 and mainly n-C17) are considerably higher than that of the corresponding ones with even carbon atoms (n-C16 and n-C18). In fact, the values obtained for the ratios (n-C17/(n-C17+n-C18)) and (n-C15/(n-C15+n-C16)) are, respectively, centered in the range of 0.97-0.95 and 0.86-0.77, which indicates that SDO mainly proceeds via deH 2 O-deCO rather than through deH 2 O as expected for nickel catalysts [5][6][7][8]10,17,18,31]. The above indicate that the presence of small amounts of copper does not disturb the SDO mechanism.…”

Section: Catalysts Evaluationmentioning

confidence: 63%

Green Diesel Production over Nickel-Alumina Nanostructured Catalysts Promoted by Copper

et al. 2020

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A series of nickel–alumina catalysts promoted by copper containing 1, 2, and 5 wt. % Cu and 59, 58, and 55 wt. % Ni, respectively, (symbols: 59Ni1CuAl, 58Ni2CuAl, 55Ni5CuAl) and a non-promoted catalyst containing 60 wt. % Ni (symbol: 60NiAl) were prepared following a one-step co-precipitation method. They were characterized using various techniques (N2 sorption isotherms, XRD, SEM-EDX, XPS, H2-TPR, NH3-TPD) and evaluated in the selective deoxygenation of sunflower oil using a semi-batch reactor (310 °C, 40 bar of hydrogen, 96 mL/min hydrogen flow rate, and 100 mL/1 g reactant to catalyst ratio). The severe control of the co-precipitation procedure and the direct reduction (without previous calcination) of precursor samples resulted in mesoporous nano-structured catalysts (most of the pores in the range 3–5 nm) exhibiting a high surface area (192–285 m2 g−1). The promoting action of copper is demonstrated for the first time for catalysts with a very small Cu/Ni weight ratio (0.02–0.09). The effect is more pronounced in the catalyst with the medium copper content (58Ni2CuAl) where a 17.2% increase of green diesel content in the liquid products has been achieved with respect to the non-promoted catalyst. The copper promoting action was attributed to the increase in the nickel dispersion as well as to the formation of a Ni-Cu alloy being very rich in nickel. A portion of the Ni-Cu alloy nanoparticles is covered by Ni0 and Cu0 nanoparticles in the 59Ni1CuAl and 55Ni5CuAl catalysts, respectively. The maximum promoting action observed in the 58Ni2CuAl catalyst was attributed to the finding that, in this catalyst, there is no considerable masking of the Ni-Cu alloy by Ni0 or Cu0. The relatively low performance of the 55Ni5CuAl catalyst with respect to the other promoted catalysts was attributed, in addition to the partial coverage of Ni-Cu alloy by Cu0, to the remarkably low weak/moderate acidity and relatively high strong acidity exhibited by this catalyst. The former favors selective deoxygenation whereas the latter favors coke formation. Copper addition does not affect the selective-deoxygenation reactions network, which proceeds predominantly via the dehydration-decarbonylation route over all the catalysts studied.

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“…However, in the real deoxygenation condition, there are many side reactions that occur, such as cracking and polymerization, which will result in hydrocarbon with different chain lengths. The hydrocarbon can be classified into gasoline, diesel, and heavy hydrocarbon according to their carbon chain length [ 26 , 39 ]. As shown in Figure 5 b, the liquid product of parent Y65 contained 27.3% gasoline (C 8 –C 12 ), 59.8% of diesel (C 13 –C 18 ), and 12.3% of heavy hydrocarbon (C 19+ ).…”

Section: Resultsmentioning

confidence: 99%

“…Among the commonly used transition metals (Ni, Fe, Cu, Co), Ni is widely studied in deoxygenation due to its high hydrogenolysis ability [ 24 , 25 , 26 ]. Besides the selection of active metals, the metal preparation method could affect the physicochemical properties and the reactivity as well [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous contribution, we tested the deoxygenation ability of various TMOs (Ni, Cu, Co, Mn, and Zn) impregnated on commercial micron-sized zeolite Y in the hydrogen-free deoxygenation of triolein. Among these TMOs, nickel oxide (NiO) showed the best deoxygenation performance [ 26 ]. Similarly, the enhancement of the deoxygenation of vegetable oil were also reported for NiO impregnated on hexagonal mesoporous silica (HMS) and aluminum-Santa Barbara Amorphous type material number 15 (Al-SBA-15) [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Deposition of NiO Nanoparticles on Nanosized Zeolite NaY for Production of Biofuel via Hydrogen-Free Deoxygenation

Choo

Daou

et al. 2020

Materials

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Nickel-based catalysts play an important role in the hydrogen-free deoxygenation for the production of biofuel. The yield and quality of the biofuel are critically affected by the physicochemical properties of NiO supported on nanosized zeolite Y (Y65, crystal size of 65 nm). Therefore, 10 wt% NiO supported on Y65 synthesized by using impregnation (IM) and deposition–precipitation (DP) methods were investigated. It was found that preparation methods have a significant effect on the deoxygenation of triolein. The initial rate of the DP method (14.8 goil·h−1) was 1.5 times higher than that of the IM method (9.6 goil·h−1). The DP-Y65 showed the best deoxygenation performance with a 80.0% conversion and a diesel selectivity of 93.7% at 380 °C within 1 h. The outstanding performance from the DP method was due to the smaller NiO particle size (3.57 ± 0.40 nm), high accessibility (H.F value of 0.084), and a higher Brönsted to Lewis acidity (B/L) ratio (0.29), which has improved the accessibility and deoxygenation ability of the catalyst. The NH4+ released from the decomposition of the urea during the DP process increased the B/L ratio of zeolite NaY. As a result, the pretreatment to convert Na-zeolite to H-zeolite in a conventional zeolite synthesis can be avoided. In this regard, the DP method offers a one-pot synthesis to produce smaller NiO-supported nanosized zeolite NaY with a high B/L ratio, and it managed to produce a higher yield with selectivity towards green diesel via deoxygenation under a hydrogen-free condition.

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Nickel catalysts supported on palygorskite for transformation of waste cooking oils into green diesel

Cited by 55 publications

References 51 publications

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

Green Diesel Production over Nickel-Alumina Nanostructured Catalysts Promoted by Copper

Deposition of NiO Nanoparticles on Nanosized Zeolite NaY for Production of Biofuel via Hydrogen-Free Deoxygenation

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