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Catalytic degradation of oxygenates in Fischer–Tropsch aqueous phase effluents to fuel gas via hydrodeoxygenation over Ru/AC catalyst
Author(s) -
Chen Lungang,
Zhu Yulei,
Zheng Hongyan,
Zhang Chenghua,
Zhang Bin,
Li Yongwang
Publication year - 2012
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2690
Subject(s) - oxygenate , hydrodeoxygenation , catalysis , chemistry , aqueous solution , organic chemistry , methane , selectivity
BACKGROUND: Aqueous phase Fischer–Tropsch (FT) effluents co‐produced with hydrocarbons in the FT process contain various water‐soluble oxygenates, e.g. carboxylic acids, alcohols. Purification of the FT aqueous phase is important from the viewpoint of effective resource utilization and environmental stewardship. In this work, an aqueous‐phase hydrodeoxygenation process was investigated for the degradation of FT aqueous phases. RESULTS: The Ru/AC catalyst was determined to be the most active catalyst. The key parameters, i.e. temperature, pressure, weight hourly space velocity and Ru loading, were comprehensively optimized. Under optimal conditions, ca 98% of the oxygenates were converted to C 1 ∼C 6 alkanes. The degraded water had no odour, a neutral pH, and as low as 1000 mg L −1 chemical oxygen demand. The Ru/AC catalyst exhibited long‐term stability (1300 h) and no ruthenium leaching. A reaction pathway is proposed for this process in which the carboxylic acids are hydrogenated to alcohols via the formation of aldehydes. Alcohols and aldehydes are then converted to methane and alkanes of one carbon atom less than the substrate through CC bond cleavage. CONCLUSIONS: This process is effective for treating FT aqueous phase effluent, and holds great promise for industrial applications due to its high efficiency, simplicity and stability. Copyright © 2011 Society of Chemical Industry