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Tailoring the Composition of Bio‐oil by Vapor‐Phase Removal of Organic Acids
Author(s) -
Zhang Jing,
Choi Yong S.,
Shanks Brent H.
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500884
Subject(s) - composition (language) , chemistry , phase (matter) , chemical engineering , vapor phase , organic chemistry , materials science , thermodynamics , philosophy , linguistics , physics , engineering
Selective removal of organic acids from biomass pyrolysis vapors was demonstrated. A broad adsorbent range was tested with CaCO 3 showing the best selectivity. Extensive material characterization demonstrated that the acid removal occurred through monolayer adsorption on CaCO 3 . Adsorbent regeneration was achieved by in situ heat treatment of the postreaction adsorbent where the adsorbed acid was converted into a ketone. The mitigation of the loss of other products was achieved by using surface modified CaCO 3 materials, resulting in a significant improvement in the selectivity toward organic acid removal. The surface modification appeared to lead to formation of a metal‐carboxylate intermediate consisting of both acetate and carbonate groups. Acetate group on the CaCO 3 surface resulted in the suppression of side reactions. Generally, a higher acid removal was accompanied with a greater loss of other compounds, which could be tuned by using CaCO 3 with different surface modification.