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http://dx.doi.org/10.7464/ksct.2021.27.1.69

Hydrotreating for Stabilization of Bio-oil Mixture over Ni-based Bimetallic Catalysts  

Lee, Seong Chan (Department of Chemical Engineering, Pukyong National University)
Zuo, Hao (Department of Chemical Engineering, Pukyong National University)
Woo, Hee Chul (Department of Chemical Engineering, Pukyong National University)
Publication Information
Clean Technology / v.27, no.1, 2021 , pp. 69-78 More about this Journal
Abstract
Vegetable oils, such as palm oil and cashew nut shell liquid (CNSL), are used as major raw materials for bio-diesel in transportation and bio-heavy oil in power generation in South Korea. However, due to the high unsaturation degree caused by hydrocarbon double bonds and a high content of oxygen originating from the presence of carboxylic acid, the range of applications as fuel oil is limited. In this study, hydrotreating to saturate unsaturated hydrocarbons and remove oxygen in mixed bio-oil containing 1/1 v/v% palm oil and CNSL on monometallic catalysts (Ni and Cu) and bimetallic catalysts (Ni-Zn, Ni-Fe, Ni-Cu Ni-Co, Ni-Pd, and Ni-Pt) was perform under mild conditions (T = 250 ~ 400 ℃, P = 5 ~ 80 bar and LHSV = 1 h-1). The addition of noble metals and transition metals to Ni showed synergistic effects to improve both hydrogenation (HYD) and hydrodeoxygenation (HDO) activities. The most promising catalyst was Ni-Cu/��-Al2O3, and in the wide range of the Ni/Cu atomic ratio of 9/1~1/4, the conversion for HYD and HDO reactions of the catalysts were 90-93% and 95-99%, respectively. The tendency to exhibit almost constant reaction activity in these catalysts of different Ni/Cu atomic ratios implies a typical structure-insensitive reaction. The refined bio-oil produced by hydrotreating (HDY and HDO) had significantly lower iodine value, acid value, and kinetic viscosity than the raw bio-oil and the higher heating value (HHV) was increased by about 10%.
Keywords
Palm oil; Cashew nut shell oil (CNSL); Hydrogenation; Hydrodeoxygenation; Bimetallic catalysts;
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Times Cited By KSCI : 2  (Citation Analysis)
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