Citation: YU Qi, ZHANG Zuhao, YIN Zhaosen, KONG Shengyan, YANG Ziheng, CHEN Jiayi, ZHANG Jinglai. Effect of Cu-Ce/γ-Al₂O₃ catalyst on bio-oil production by hydrothermal deoxygenation of stearic acid[J]. Chinese Journal of Chromatography, ;2019, 37(4): 454-461. doi: 10.3724/SP.J.1123.2018.10032 shu

Effect of Cu-Ce/γ-Al₂O₃ catalyst on bio-oil production by hydrothermal deoxygenation of stearic acid

1.
Renmin University of China, Beijing 100872, China;
2.
Datang Environment Industry Group Co. Ltd., Beijing 100098, China

Received Date: 22 October 2018

Fund Project: Fund for Building World-Class Universities (Disciplines) of Renmin University of China.

In order to improve the hydrothermal deoxygenation of organic acids as well as to reduce the cost, we prepared a Cu-Ce/γ-Al₂O₃ catalyst to study the hydrothermal deoxygenation of stearic acid in the absence of H₂. The Brunauer-Emmett-Teller surface area and X-ray diffraction pattern suggest that both CuO and CeO₂ exist in the Cu-Ce/γ-Al₂O₃ catalyst. The crystals of Cu-Ce/γ-Al₂O₃ were more stable compared with those of the Cu/γ-Al₂O₃ catalyst after 12 h of hydrothermal liquefaction at 300℃, thereby indicating a better thermal stability of the former. The presence of Cu-Ce/γ-Al₂O₃ catalyst could greatly improve the conversion of stearic acid (94.71%) and the yield of hydrocarbon (81.41%). A preliminary analysis of the mechanism suggests that decarboxylation is the main step in the deoxygenation during the hydrothermal liquefaction of stearic acid. The addition of Cu/γ-Al₂O₃ and Cu-Ce/γ-Al₂O₃ decreased the yield of n-heptadecane and increased the yield of n-octadecane. Besides, the yields of n-paraffins increased drastically from 0.45% to 49.72% along the series from n-nonane to n-hexadecane. Thus, the cracking reactions could be improved in the presence of Cu-Ce/γ-Al₂O₃, suggesting that it is an efficient deoxygenation catalyst in the hydrothermal liquefaction of organic acid. In addition, the Cu-Ce/γ-Al₂O₃ catalyst could help in removing the carbonyl groups, and this effectively reduced the amounts of aldehydes and ketones in the bio-oil.
- stearic acid,
- hydrothermal liquefaction,
- Cu-Ce/γ-Al₂O₃ catalyst,
- gas chromatography-mass spectrometry (GC-MS),
- bio-oil,
- deoxygenation
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Cu-Ce/γ-Al2O3 catalyst on bio-oil production by hydrothermal deoxygenation of stearic acid

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通讯作者: 陈斌, bchen63@163.com

Effect of Cu-Ce/γ-Al₂O₃ catalyst on bio-oil production by hydrothermal deoxygenation of stearic acid