1. Effect of Ni/Al2O3 mixing on the coking behavior of bio-oil during its pyrolysis: Further understanding based on the interaction between its components.
- Author
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Deng, Zengtong, Syed-Hassan, Syed Shatir A., Chen, Yuanjing, Jiang, Long, Xu, Jun, Hu, Song, Su, Sheng, Wang, Yi, and Xiang, Jun
- Subjects
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ALUMINUM oxide , *PYROLYSIS , *LIGNINS , *COAL carbonization , *CATALYTIC cracking , *PETROLEUM - Abstract
[Display omitted] • Coke formation during bio-oil pyrolysis was inhibited via Ni/Al 2 O 3 mixing. • Influence of Ni/Al 2 O 3 mixing on aromatic structures of products was investigated. • Interaction among AF, LDO and Ni/Al 2 O 3 during bio-oil pyrolysis was revealed. • Mechanism for bio-oil pyrolysis with Ni/Al 2 O 3 mixing was proposed. Bio-oil can be converted to chemicals, carbon material, or syngas by various thermochemical processes which are always preceded with the pyrolysis step. In bio-oil pyrolysis, coke formation is almost inevitable, causing difficulties for further processing. In this study, bio-oil was mixed with Ni/Al 2 O 3 before it was fed for pyrolysis. Interesting results were observed whereby the effect of Ni/Al 2 O 3 mixing on coke formation shifted from promoting to inhibiting with increasing pyrolysis temperature. When the temperature was higher than 700 °C, contrary to the cases without mixing, the apparent decreases in coke yield were observed (e.g., the coke yield decreased by 10% at 800 °C). Comparative studies on bio-oil and its lignin-derived oligomer fraction indicated that the catalytic cracking of small molecules could enhance the formation of hydrogen radicals, which promoted thermal decomposition of lignin-derived oligomers, thus inhibiting coke formation via polymerization. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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