Enhancement of bio-oil hydrodeoxygenation activity over Ni-based bimetallic catalysts supported on SBA-15. (April 2020)

• Record Type: Journal Article
• Authors: Oh, Shinyoung; Lee, Jae Hoon; Choi, In-Gyu; Choi, Joon Weon
• Is Part Of: Renewable energy. Volume 149(2020)
• Page Start: 1
• Page End: 10
• Publication Date: 2020-04
• Subjects: Bio-oil -- Hydrodeoxygenation -- Bimetallic catalyst -- Mesoporous silica support; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2019.12.027
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Three Ni-based bimetallic catalysts were prepared on hexagonally structured mesoporous SBA-15 supports(NiCu/SBA-15, NiMn/SBA-15, NiZn/SBA-15). Hydrodeoxygenation (HDO) of biooil was performed at 250–350 °C for 45 min with 3 MPa H2 pressure in the presence of the three catalysts. HDO reaction yielded a primary products of gas, two immiscible liquids (light oil and heavy oil) and char. High catalyst surface area resulted in a high heavy oil yield (40.8–60.6 wt%). Bimetallic catalysts decreased yield of light oil (3.6–11.7 wt%), while increased the gas fraction (16.3–43.7 wt%) compared with the data from the monometallic Ni/SBA-15 catalyst (20.3–30.4 and 6.6–26.2 wt% yields, respectively). Use of bimetallic catalysts instead of monometallic catalyst enhanced fuel properties of heavy oil; such as moisture content (from 11.4 to 2.0–8.8 wt%), acidity (from 62.2 to 49.2–59.8 mg KOH/g oil), viscosity (from 7.1 to 3.2–4.3 cSt) and oxygen content (from 32.2 to 26.2–34.6 wt%). Cyclohexanone, 4-ethylphenol, and methyl-cyclopentenone, which were lack in the bio-oil, were detected after HDO reaction and these components could be produced via demethoxylation, hydrogenation, dehydration, and dehydroxylation under the presence of bimetallic catalysts, thereby improving the fuel properties of the heavy oil. Highlights: Bimetallic catalysts on SBA-15 was prepared to enhance the activity of Ni/SBA-15. Heavy oil yield and properties improved compared with monometallic Ni catalyst. NiCu/SBA-15 effectively catalyzed dehydration, resulted in low water content in heavy oil. NiZn/SBA-15 produced high HHV of heavy oil, through its high deoxygenation activity. At the high temperature, NiMn/SBA-15 could conduct the most efficient process.