Catalytic properties of CoMo/Al2O3 sulfide catalysts in the hydrorefining of straight-run diesel fraction mixed with rapeseed oil

Власова, Е. Н.; Deliy, Irina V.; Nuzhdin, Alexey L.; Aleksandrov, Pavel V.; Gerasimov, Evgeny Yu.; Aleshina, G. I.; Bukhtiyarova, G. A.

doi:10.1134/s0023158414040144

Cited by 15 publications

(5 citation statements)

References 40 publications

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“…Decarboxylation dominates under inert conditions, especially when Pd/C and Pt/C are employed as catalysts [39]. HDO of fatty acid occurs in high-pressure, hydrogen-rich conditions, typically over metal supported on zeolite (Ni/HZSM-5 and Ni/HBeta) [34] or sulfide metal supported on alumina [40]. Decarbonylation dominates in the presence of H 2 over metal based catalysts, such as Ni/C [18] and Ni/ZrO 2 [10].…”

Section: Effect Of Water On Catalytic Deoxygenation Of Pamentioning

confidence: 99%

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Miao

Marin‐Flores

Davidson

et al. 2016

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112

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Fatty acid has recently received considerable interest as a possible precursor for producing renewable hydrocarbon. In this study, we investigated hydrothermal catalytic deoxygenation of palmitic acid to produce paraffin over a Ni/ZrO 2 catalyst with no or low-pressure (100 psi) external supply of H 2. The results show that the presence of water greatly improved conversion of palmitic acid and paraffin yield. Significant improvement was attributed to the formation of in-situ H 2. Without an external H 2 supply, a 64.2 C% conversion of palmitic acid was achieved in the presence of water, while only a 17.2 C% conversion was achieved without water. The results also show that the presence of water suppressed the side reactions of palmitic acid, specifically ketonization and esterification. We concluded that, compared with decarboxylation and hydrodeoxygenation, decarbonylation was the major route for palmitic acid deoxygenation catalyzed by Ni/ZrO 2. Varieties of shorter-chain paraffin (C 8-C 14) were formed through hydrogenolysis, which also produced a considerable amount of CH 4. A viable reaction pathway for hydrothermal catalytic deoxygenation of palmitic acid in the presence of Ni/ZrO 2 was suggested. The results show that hydrogenolysis and decarbonylation were the major reactions that occurred. This study demonstrates that this hydrothermal catalytic process is a promising approach for producing liquid paraffin (C 8-C 15) from fatty acids under no or low-pressure H 2 .

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Section: Effect Of Water On Catalytic Deoxygenation Of Pamentioning

confidence: 99%

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Miao

Marin‐Flores

Davidson

et al. 2016

Fuel

112

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“…For hydrotreating catalysts, a sulphiding agent should be continuously fed to the reaction mixture to prevent deactivation [30]. Besides, water and carbon oxides can negatively influence the catalytic properties of supported noble metal and metal sulphide catalysts [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Synergetic Effect of Ni2P/SiO2 and γ-Al2O3 Physical Mixture in Hydrodeoxygenation of Methyl Palmitate

et al. 2017

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Abstract:The Ni 2 P/SiO 2 catalyst, which was prepared by in situ temperature-programmed reduction and in the mixture with the inert (SiC, SiO 2 ) or acidic (γ-Al 2 O 3 ) material was studied in methyl palmitate hydrodeoxygenation (HDO). Methyl palmitate HDO was carried out at temperatures of 270-330 • C, H 2 /feed volume ratio of 600 Nm 3 /m 3 , and H 2 pressure of 3.0 MPa. Ni 2 P/SiO 2 catalyst, diluted with γ-Al 2 O 3 showed a higher activity than Ni 2 P/SiO 2 catalyst diluted with SiC or SiO 2 . The conversion of methyl palmitate increased significantly in the presence of γ-Al 2 O 3 most probably due to the acceleration of the acid-catalyzed reaction of ester hydrolysis. The synergism of Ni 2 P/SiO 2 and γ-Al 2 O 3 in methyl palmitate HDO can be explained by the cooperation of the metal sites of Ni 2 P/SiO 2 and the acid sites of γ-Al 2 O 3 in consecutive metal-catalyzed and acid-catalyzed reactions of HDO. The obtained results let us conclude that the balancing of metal and acid sites plays an important role in the development of the efficient catalyst for the HDO of fatty acid esters over supported phosphide catalysts.

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“…The selectivity towards decarbonylation/decarboxylation and hydrodeoxygenation depends on the reaction conditions and type of the catalyst employed. [10][11][12][13] Sulded NiMo/Al 2 O 3 and CoMo/Al 2 O 3 catalysts are widely investigated [14][15][16][17] and already used in commercial HDO processes: NExBTL® Process (Neste Oil), Econing™ Process for Green Diesel Production (UOP/Eni). 3 However, these systems display low stability in HDO reactions without addition of sul-dation agent to the feed.…”

Section: Introductionmentioning

confidence: 99%

Effect of precursor on the catalytic properties of Ni₂P/SiO₂ in methyl palmitate hydrodeoxygenation

et al. 2016

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Catalytic properties of CoMo/Al2O3 sulfide catalysts in the hydrorefining of straight-run diesel fraction mixed with rapeseed oil

Cited by 15 publications

References 40 publications

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Synergetic Effect of Ni2P/SiO2 and γ-Al2O3 Physical Mixture in Hydrodeoxygenation of Methyl Palmitate

Effect of precursor on the catalytic properties of Ni₂P/SiO₂ in methyl palmitate hydrodeoxygenation

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Catalytic properties of CoMo/Al2O3 sulfide catalysts in the hydrorefining of straight-run diesel fraction mixed with rapeseed oil

Cited by 15 publications

References 40 publications

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Hydrothermal catalytic deoxygenation of palmitic acid over nickel catalyst

Synergetic Effect of Ni2P/SiO2 and γ-Al2O3 Physical Mixture in Hydrodeoxygenation of Methyl Palmitate

Effect of precursor on the catalytic properties of Ni2P/SiO2 in methyl palmitate hydrodeoxygenation

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Effect of precursor on the catalytic properties of Ni₂P/SiO₂ in methyl palmitate hydrodeoxygenation