| Title: | Tailoring the Composition of Bio-oil by Vapor-Phase Removal of Organic Acids |
| Author(s): | Zhang J; Choi YS; Shanks BH; |
| Address: | "Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011-2230, USA. Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011-2230, USA. bshanks@iastate.edu" |
| ISSN/ISBN: | 1864-564X (Electronic) 1864-5631 (Linking) |
| Abstract: | "Selective removal of organic acids from biomass pyrolysis vapors was demonstrated. A broad adsorbent range was tested with CaCO3 showing the best selectivity. Extensive material characterization demonstrated that the acid removal occurred through monolayer adsorption on CaCO3. 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 CaCO3 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 CaCO3 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 CaCO3 with different surface modification" |
| Keywords: | Acetic Acid/chemistry/*isolation & purification Adsorption *Biofuels Biomass Calcium Carbonate/chemistry Carboxylic Acids/chemistry/*isolation & purification Lignin/chemistry Surface Properties Temperature Volatilization acids heterogeneous catalysis pyro; |
| Notes: | "MedlineZhang, Jing Choi, Yong S Shanks, Brent H eng Research Support, Non-U.S. Gov't Germany 2015/11/27 ChemSusChem. 2015 Dec 21; 8(24):4256-65. doi: 10.1002/cssc.201500884. Epub 2015 Nov 26" |
