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Energies 2015, 8(6), 5898-5915; doi:10.3390/en8065898

Oxygen-Containing Fuels from High Acid Water Phase Pyrolysis Bio-Oils by ZSM−5 Catalysis: Kinetic and Mechanism Studies

Bioproducts, Sciences and Engineering Laboratory, Department of Biological Systems Engineering, Washington State University, Richland, WA 99354-1671, USA
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Author to whom correspondence should be addressed.
Academic Editor: Thomas E. Amidon
Received: 24 March 2015 / Revised: 2 June 2015 / Accepted: 9 June 2015 / Published: 17 June 2015
(This article belongs to the Special Issue Bioenergy and Biorefining)
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Abstract

This study developed an upgrading process focusing on acid transformations of water phase pyrolysis bio-oils to esters of oxygen-containing fuels via ZSM−5 catalyst. Temperature was set as a factor with five levels ranging from 60 to 135 °C with reaction time from 1 to 8 h. The results showed that 89% of high acid conversion and over 90% of ester selectivity was obtained from the feedstock via 2 wt % ZSM−5 catalysts in a fixed feedstock to methanol ratio analyzed by HPLC and GC–MS. The upgrading process followed Langmuir–Hinshelwood and reaction constants were calculated to build a practical upgrading model for bio-oil compounds. Thermodynamics of the process showed endothermic properties during the breaking bonds’ reaction on carbonyl of acid while the reaction between the carbon in methanol and electrophile acid intermediate demonstrated exothermic performance. The optimum reaction conditions for the process was at a temperature of 100.1 °C with catalyst loading of 3.98 wt %. View Full-Text
Keywords: bio-oil; esters; oxygen-containing fuels; ZSM−5; kinetic; mechanism bio-oil; esters; oxygen-containing fuels; ZSM−5; kinetic; mechanism
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wei, Y.; Lei, H.; Zhu, L.; Zhang, X.; Yadavalli, G.; Liu, Y.; Yan, D. Oxygen-Containing Fuels from High Acid Water Phase Pyrolysis Bio-Oils by ZSM−5 Catalysis: Kinetic and Mechanism Studies. Energies 2015, 8, 5898-5915.

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