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Continuous catalytic deoxygenation of model and algal lipids to fuel-like hydrocarbons over Ni–Al layered double hydroxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
53603 46977 2015 10 PDF Available
Title
Continuous catalytic deoxygenation of model and algal lipids to fuel-like hydrocarbons over Ni–Al layered double hydroxide
Abstract

•Ni-based catalysts can efficiently convert triglycerides into fuel-like hydrocarbons.•Complete triglyceride conversion was obtained at temperatures as low as 260 °C.•The effects of key reaction variables on catalyst performance were investigated.•Upgrading an algae extract to diesel-like hydrocarbons afforded promising results.•A Ni–Al LDH catalyst was found to be very stable in a 72 h fixed-bed reactor run.

The deoxygenation of lipid-based feeds to diesel-like hydrocarbons was investigated over a series of oxide-supported Ni catalysts. Catalyst screening in a semi-batch reactor revealed that a Ni–Al layered double hydroxide formulation afforded a higher yield of hydrocarbons in the diesel range than 20 wt% Ni/Al2O3, 20 wt% Ni/ZrO2, 20 wt% and Ni/La-CeO2 (lanthanum-stabilized ceria). Through a series of fixed bed reactor experiments involving model lipids in which reaction conditions – including temperature, hydrogen partial pressure and feed to catalyst ratio – were systematically changed, the effects of these variables on catalyst performance were elucidated. Based on the results of these experiments the optimum set of conditions was identified and applied to the conversion of realistic feeds, including the oil extracted from algae cultured using flue gas from a coal-fired power plant. Catalyst stability studies showed Ni–Al layered double hydroxide to be a stable formulation, no significant loss of activity being observed between 6 and 72 h on stream under conditions known to promote catalyst deactivation, namely the use of an unsaturated feed – comprising both a triglyceride and a considerable amount of free fatty acids – in high concentration.

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Keywords
Deoxygenation; Decarboxylation; Layered double hydroxide; Nickel; Triglyceride; Algae
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Continuous catalytic deoxygenation of model and algal lipids to fuel-like hydrocarbons over Ni–Al layered double hydroxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 2, 1 December 2015, Pages 284–293
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us