Print Email Facebook Twitter The effects of combined catalysis of oxalic acid and seawater on the kinetics of xylose and arabinose dehydration to furfural Title The effects of combined catalysis of oxalic acid and seawater on the kinetics of xylose and arabinose dehydration to furfural Author Hongsiri, W. Danon, B. De Jong, W. Faculty Mechanical, Maritime and Materials Engineering Department Process and Energy Date 2014-11-12 Abstract It is known that both acids and salts have a positive catalytic effect on the dehydration of pentoses to form furfural, a potentially attractive platform chemical. In this study the effects of the combined usage of an organic acid, instead of stronger mineral acids, and a saline catalyst is investigated. In order to assess these effects, the kinetics of pentose dehydration to furfural are studied using oxalic acid as the primary catalyst and NaCl or seawater as the secondary saline catalyst. The interactions between these two types of catalysts are complex and are, therefore, also assessed thermodynamically. The addition of salts lowers the activity coefficient of the hydronium ions, but simultaneously favours the dissociation of the organic acid. It turned out that these two effects are of similar magnitude, resulting in a fairly constant hydronium ion activity. Because nonetheless higher furfural yields are obtained using the salts as a secondary catalyst, it is concluded that the salts influence the pentose dehydration mechanism directly. The final furfural yields obtained using oxalic acid as the primary catalyst were only slightly lower than those for similar experiments using HCl. The most distinctive difference between the two acids is the lower reaction rate (and thus longer reaction times) when using oxalic acid. Finally, it was observed that if no acidic catalyst is used, the salts tend to catalyse a loss reaction, which is suppressed when an acid is present. Subject furfuralpentose dehydrationoxalic acidseawaterbiorefinery To reference this document use: http://resolver.tudelft.nl/uuid:ef0a2a88-294d-484b-99d9-00986b1ff9d3 Publisher Springer ISSN 2008-9163 Source https://doi.org/10.1007/s40095-014-0146-9 Source International Journal of Energy and Environmental Engineering, 6 (1), 2015 Part of collection Institutional Repository Document type journal article Rights (c) 2014 The author(s). This article is published with open access at Springerlink.com Files PDF 315872.pdf 1.5 MB Close viewer /islandora/object/uuid:ef0a2a88-294d-484b-99d9-00986b1ff9d3/datastream/OBJ/view