除氧
化学
催化作用
植物油精炼
有机化学
不饱和度
亚麻籽油
大豆油
脂肪酸
柴油
食品科学
生物柴油
作者
Tae‐Hyoung Kim,Kyungho Lee,Myoung Yeob Kim,Yong Keun Chang,Minkee Choi
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-10-25
卷期号:6 (12): 17168-17177
被引量:29
标识
DOI:10.1021/acssuschemeng.8b04552
摘要
Deoxygenation of triglycerides (e.g., vegetable and microalgae oils) through hydro-upgrading is one of the most important routes to produce oxygen-free hydrocarbon fuels from biomass. Even though natural triglycerides are composed of fatty acids of different structures, their effects on catalytic selectivity and deactivation during deoxygenation have not been comprehensively investigated. In this study, we used three different reactant triglycerides including palm oil, soybean oil, and linseed oil for catalytic deoxygenation over Pt/γ-Al2O3. These oils consist of fatty acids with increasing degrees of unsaturation in the order of palm oil (number of C═C per fatty acid: 0.55) < soybean oil (1.33) < linseed oil (2.18). The catalytic results showed that the increased unsaturation of the triglycerides caused enhanced formation of heavy products by oligomerization (mostly dimers) of unsaturated fatty acid derivatives through Diels–Alder reaction and/or radical addition. These heavy products were readily transformed to coke species, causing catalyst deactivation. In this regard, we demonstrated that the prehydrogenation of triglycerides at a mild temperature is highly beneficial for steadily obtaining a high yield of diesel-range paraffins and retarding catalyst deactivation in deoxygenation.
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