Al Shra’ah, Ahmad Q. (2014) Low temperature microwave pyrolysis of lignocellulosic materials for renewable fuels and chemicals. Masters thesis, Memorial University of Newfoundland.
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Microwave pyrolysis of lignocellulosic materials (cellulose, lignin, xylan, white birch) were investigated at the relatively low temperatures of 200-300ᴼC and low power of 300 W. Effects of temperature, microwave absorber (activated carbon and water), closed/open microwave, and cellulose crystallinity on yield and product distribution were examined. Microwave results were compared with higher temperature (250-475ᴼC) conventional pyrolysis using pyrolysis-gas chromatography. Results from both microwave and conventional method revealed that increasing temperature produced more bio-oil at the expense of biochar. Bio-oil yields with microwave pyrolysis from cellulose, xylan and white birch at 260ᴼC were 45%, 47%, and 17%, respectively, while lignin required microwave heating up to 280ᴼC to give only 4% yield. Torrefaction improved the quality of bio-oil but also increased the biochar yield while reducing bio-oil. High yields of useful levoglucosan were obtained from microwave pyrolysis of amorphous cellulose. Addition of the adsorbent water increased bio-oil production by 25%.
|Item Type:||Thesis (Masters)|
|Additional Information:||Includes bibliographical references.|
|Department(s):||Science, Faculty of > Chemistry|
|Library of Congress Subject Heading:||Pyrolysis; Lignocellulose--Effect of low temperatures on; Microwaves; Biomass conversion|
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