Hydrodeoxygenation of methyl esters on sulphided NiMo/γ-Al2O3 and CoMo/γ-Al2O3 catalysts

Şenol, O.I.; Viljava, Tuula-Riitta; Krause, A.O.I.

doi:10.1016/j.cattod.2004.10.021

Cited by 270 publications

(138 citation statements)

References 8 publications

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“…Upgrading crude bio-oil through either catalytic cracking or hydroprocessing has been extensively studied [14][15][16][17][18][19][20][21][22][23][24][25][26][27], however, the upgrading process is complicated due to the complexity of the biooil, resulting in low yields and high processing costs. Pre-treating biomass prior to pyrolysis has the potential to improve the quality of crude pyrolysis bio-oil and thus, increase the efficiency of upgrading via catalytic cracking and hydroprocessing processes through reduced reactor clogging and catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

Wigley

Yip

Pang

2015

Journal of Analytical and Applied Pyrolysis

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Pre-treatments of biomass were investigated to reduce its undesirable properties which may affect the quality of fast pyrolysis bio-oil. A pre-treatment sequence was developed in this study to incorporate both biomass demineralisation and torrefaction. Demineralisation was performed by dilute acid leaching, primarily to reduce the inorganic concentration in raw biomass, whereas torrefaction targeted a reduction of the carboxyl, moisture and oxygen content. The liquid produced during torrefaction was recycled back as the leaching reagent for demineralisation. This solution contained dilute organic acids; therefore, the viability of leaching with organic acids (acetic and formic acid) compared to commonly used mineral acids (sulphuric, nitric and hydrochloric acid) was validated. Synthetic leaching solutions reduced the inorganic content in raw biomass from 0.41 wt% to 0.14 wt% when leached with 1% formic acid and to 0.16 wt% when leached with 1% acetic acid, which was comparable to leaching with the mineral acids. Recycled torrefaction liquid that contained other acidic compounds in small quantities reduced the inorganic content to 0.14 wt%, suggesting it is effective to use the recycled torrefaction liquid as the leaching solution. From the experimental results, the optimal conditions for biomass torrefaction were 260 °C for 20 min to minimise the char formation during pyrolysis, based on the increase in the acid-insoluble fraction of the biomass. However, the torrefaction temperature may be increased to 280 °C if further reductions in acetyl and oxygen content are required. Higher temperatures are associated with severe biomass loss and the initiation of hydrogen loss. It should be noted that even at 280 °C, the oxygen reduction is minimal. If oxygen reduction is the principal target when pre-treating biomass, it is suggested that torrefaction alone is not a suitable method to obtain bio-oil with a low oxygen content due to the low pyrolysis yields obtainable. This study demonstrated that the combined use of demineralisation and torrefaction as biomass pre-treatments has the ability to decrease the inorganic, acetyl and moisture content of biomass, which reduces undesirable catalytic reactions during fast pyrolysis to improve the quality of bio-oil produced.

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Section: Introductionmentioning

confidence: 99%

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

Wigley

Yip

Pang

2015

Journal of Analytical and Applied Pyrolysis

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“…Triglyceride-based feedstocks are widely studied as a resource for the production of diesel-range or aviation fuel through the hydrodeoxygenation (HDO) process using aliphatic ether or acid as model compounds [1][2][3][4][5]. HDO of triglycerides, fatty esters and acids produce an oxygen-free mixture of alkanes which are the valuable components compatible with petroleum-based motor fuels [6].…”

Section: Introductionmentioning

confidence: 99%

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

et al. 2017

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Two sets of silica-supported nickel phosphide catalysts with a nickel content of about 2.5 and 10 wt % and Ni/P molar ratio 2/1, 1/1 and 1/2 in each set, were prepared by way of a temperature-programmed reduction method using (Ni(CH 3 COO) 2 ) and ((NH 4 ) 2 HPO 4 ) as a precursor. The Ni x P y /SiO 2 catalysts were characterized using chemical analysis N 2 physisorption, XRD, TEM, 31 P MAS NMR. Methyl palmitate hydrodeoxygenation (HDO) was performed in a trickle-bed reactor at 3 MPa and 290 • C with LHSV ranging from 0.3 to 16 h −1 . The Ni/P ratio was found to affect the nickel phosphide phase composition, PO x groups content and catalytic properties in methyl palmitate HDO with the TOF increased along with a decline of Ni/P ratio and a growth of PO x groups' content. Taking into account the possible routes of methyl palmitate conversion (metal-catalyzed hydrogenolysis or acid-catalyzed hydrolysis), we proposed that the enhancement of acid PO x groups' content with the Ni/P ratio decrease provides an enhancement of the rate of methyl palmitate conversion through the acceleration of acid-catalyzed hydrolysis.

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“…An experiments done throughout the rection of Mo 12 (wt%) dan Co (4%), then it is used to load Mo (12 wt%) and Ni (4 wt%) would derive conversion reaction of 26.5 % [29]. At the same vein, methyl heptanoate and methyl hexanoate use catalysts CoMo/-Al2O3 with sulfidation process can yield reaction conversion up to 46.6 % (250 o C), 78.4 % (275 o C) and 100% (300 o C); while catalysts of CoMo/γ-Al2O3 that is in the form of oxide would yield conversion up to in the temperature 300 o C [30].…”

Section: Bulletin Of Chemical Reaction Engineering and Catalysismentioning

confidence: 96%

Hydrocracking of Calophyllum inophyllum Oil With Non-sulfide CoMo Catalysts

Rasyid

Prihartantyo

Mahfud

et al. 2014

Bull. Chem. React. Eng. Catal.

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This research was aimed to convert Calophyllum inophyllum kernel oil into liquid fuel through hydrocracking process using non-sulfide CoMo catalysts. The experiment was carried out in a pressurized reactor operated at temperature and pressure up to 350 o C and 30 bar, respectively. The CoMo catalysts used in the experiment were prepared by 10 wt.% loading of cobalt and molybdenum solutions over various supports, i.e. -Al2O3, SiO2, and -Al2O3-SiO2 through impregnation method. It is figured out from the experiment that non-sulfide CoMo based catalysts have functioned well in the hydrocracking conversion of Calophyllum inophyllum kernel oil into fuels, such as gasoline, kerosene, and gasoil. The CoMo/-Al2O3 catalyst resulted higher conversion than CoMo/SiO2 and CoMo/-Al2O3-SiO2. The fuel yields were 25.63% gasoline, 17.31% kerosene, and 38.59% gasoil. The fuels obtained in this research do not contain sulfur compounds so that they can be categorized as environmentally friendly fuels.

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Hydrodeoxygenation of methyl esters on sulphided NiMo/γ-Al2O3 and CoMo/γ-Al2O3 catalysts

Cited by 270 publications

References 8 publications

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

Hydrocracking of Calophyllum inophyllum Oil With Non-sulfide CoMo Catalysts

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