Hydrodeoxygenation of waste fat for diesel production: Study on model feed with Pt/alumina catalyst

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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@article{909a3884228d43218e94f8516bddbfaf,
title = "Hydrodeoxygenation of waste fat for diesel production: Study on model feed with Pt/alumina catalyst",
keywords = "Alkanes, Biodiesel, Fats and oils, Hydrogenation, Decarboxylation",
author = "Madsen, {Anders Theilgaard} and Ahmed, {El Hadi} and Christensen, {Claus H.} and Rasmus Fehrmann and Anders Riisager",
year = "2011",
doi = "10.1016/j.fuel.2011.06.005",
volume = "90",
pages = "3433--3438",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier Ltd.",
number = "11",

}

RIS

TY - JOUR

T1 - Hydrodeoxygenation of waste fat for diesel production: Study on model feed with Pt/alumina catalyst

AU - Madsen,Anders Theilgaard

AU - Ahmed,El Hadi

AU - Christensen,Claus H.

AU - Fehrmann,Rasmus

AU - Riisager,Anders

PY - 2011

Y1 - 2011

N2 - Hydrodeoxygenation of waste fats and oils is a viable method for producing renewable diesel oil. In this study a model feed consisting of oleic acid and tripalmitin in molar ratio 1:3 was hydrotreated at 325°C with 20bars H2 in a stirred batch autoclave with a 5wt% Pt/γ-Al2O3 catalyst, and samples were extracted periodically and analyzed on GC. Despite the significant hydrogen pressure hydrogenation of both reactants were limited and decarboxylation or decarbonylation of the ester and carboxylic acid functionalities were highly favored, yielding carbon chain lengths of odd numbers. Moreover, Pd/γ-Al2O3 was observed to be slightly more active than Pt/γ-Al2O3 and had a higher ratio of decarboxylation and decarbonylation to hydrogenation, while Ni/γ-Al2O3 was substantially less active than Pt and also showed a markedly lower ratio of decarboxylation and decarbonylation to hydrogenation. Variation of the temperature showed that triglycerides as well as free fatty acids were converted at all investigated temperatures, but the conversion of oleic acid increased from 6% to 100% when the temperature was increased from 250°C to 325°C. The tripalmitin reacted via a palmitic acid intermediate, and its conversion was limited by formation of this free fatty acid.

AB - Hydrodeoxygenation of waste fats and oils is a viable method for producing renewable diesel oil. In this study a model feed consisting of oleic acid and tripalmitin in molar ratio 1:3 was hydrotreated at 325°C with 20bars H2 in a stirred batch autoclave with a 5wt% Pt/γ-Al2O3 catalyst, and samples were extracted periodically and analyzed on GC. Despite the significant hydrogen pressure hydrogenation of both reactants were limited and decarboxylation or decarbonylation of the ester and carboxylic acid functionalities were highly favored, yielding carbon chain lengths of odd numbers. Moreover, Pd/γ-Al2O3 was observed to be slightly more active than Pt/γ-Al2O3 and had a higher ratio of decarboxylation and decarbonylation to hydrogenation, while Ni/γ-Al2O3 was substantially less active than Pt and also showed a markedly lower ratio of decarboxylation and decarbonylation to hydrogenation. Variation of the temperature showed that triglycerides as well as free fatty acids were converted at all investigated temperatures, but the conversion of oleic acid increased from 6% to 100% when the temperature was increased from 250°C to 325°C. The tripalmitin reacted via a palmitic acid intermediate, and its conversion was limited by formation of this free fatty acid.

KW - Alkanes

KW - Biodiesel

KW - Fats and oils

KW - Hydrogenation

KW - Decarboxylation

U2 - 10.1016/j.fuel.2011.06.005

DO - 10.1016/j.fuel.2011.06.005

M3 - Journal article

VL - 90

SP - 3433

EP - 3438

JO - Fuel

T2 - Fuel

JF - Fuel

SN - 0016-2361

IS - 11

ER -