Selective conversion of bio-oil to light olefins: Controlling catalytic cracking for maximum olefins

[Display omitted] ► Light olefins are the key and basic feedstock for petrochemical industry. ► Selective production of olefins from bio-oil realized by La-modified zeolite. ► The olefins yield from bio-oil is close to the level from methanol. ► The olefins yield from bio-oil is about 85% of the the...

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Bibliographic Details
Published in:Bioresource technology 2011-10, Vol.102 (19), p.9247-9254
Main Authors: Gong, Feiyan, Yang, Zhi, Hong, Chenggui, Huang, Weiwei, Ning, Shen, Zhang, Zhaoxia, Xu, Yong, Li, Quanxin
Format: Article
Language:English
Subjects:
Alkenes - chemical synthesis
Alkenes - chemistry
Bio-oil
Biological and medical sciences
Catalysis
Catalysts
Catalytic cracking
Conversion
Fundamental and applied biological sciences. Psychology
Hot Temperature
La/HZSM-5 catalyst
Lanthanum - chemistry
Light olefins
Magnetic Resonance Spectroscopy
Methyl alcohol
Models, Chemical
Olefins
Photoelectron Spectroscopy
Plant Oils - chemistry
Pyrolysis
Stability
X-Ray Diffraction
Zeolites
Zeolites - chemistry
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Summary:[Display omitted] ► Light olefins are the key and basic feedstock for petrochemical industry. ► Selective production of olefins from bio-oil realized by La-modified zeolite. ► The olefins yield from bio-oil is close to the level from methanol. ► The olefins yield from bio-oil is about 85% of the theoretical yield. ► Increasing medium acid sites enhance olefin selectivity and suppress coke formation. Light olefins are the basic building blocks for the petrochemical industry. In this work, selective production of light olefins from catalytic cracking of bio-oil was performed by using the La/HZSM-5 catalyst. With a nearly complete conversion of bio-oil, the maximum yield reached 0.28±0.02kg olefins/(kg bio-oil), which was close to that from methanol. Addition of La into zeolite efficiently changed the total acid amount of HZSM-5, especially the acid distribution among the strong, medium and weak acid sites. A moderate increase of the number of the medium acid sites effectively enhanced the olefins selectivity and improved the catalyst stability. The comparison between the catalytic cracking and pyrolysis of bio-oil was studied. The mechanism of the conversion of bio-oil to light olefins was also discussed.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2011.07.009