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Document Type

Thesis - University Access Only

Award Date

2015

Degree Name

Master of Science (MS)

Department

Agricultural and Biosystems Engineering

First Advisor

Lin Wei

Abstract

The aim of this work was to produce advanced liquid bio-fuels through thermal conversion of the pine sawdust. Combining an experimental two-stage catalytic pyrolysis system, two rounds of experiments were carried out to investigate the optimal reaction temperature for the HZSM-5 catalyst and the optimal Mo/Cu ratio with regard to Mo- Cu/HZSM-5 catalysts for obtaining qualified bio-fuels. In the first round of experiments, the pine sawdust thermal conversions over HZSM-5 catalysts were performed under different reaction temperatures in the experimental two-stage catalytic pyrolysis system. It was observed that higher temperatures in the catalytic reactor decreased the yield of bio-oil. However, the bio-oil quality was improved. The GC-MS analysis results of the liquid products showed that the pyrolysis reaction at 500 °C and catalytic reaction at 500 °C treatment obtained the highest hydrocarbon content (58.63%) and the highest C8-C12 content (48.03%) in the oil phase. Along with the water content, density, and pH characterization of bio-oils, the pyrolysis reaction at 500 °C and catalytic reaction at 500 °C using HZSM-5 catalyst treatment was further demonstrated as the optimal temperature to achieve low viscosity and higher HHV bio-oils. The XRD characterization indicated that HZSM-5 catalysts had no crystal lattice changes before or after use, which makes HZSM-5 catalyst regeneration possible. In the second round of experiments, Mo-Cu/HZSM-5 catalysts were prepared by an impregnation method. The Mo-Cu/HZSM-5 catalysts and HZSM-5 were characterized xi by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and transmission electron microscopy (TEM). All characterization results indicated that the introduction of CuO is beneficial to the dispersion of MoO3 in the HZSM-5. Combined with the two-stage catalytic pyrolysis system, the Mo-Cu/HZSM-5 catalysts were used for pine sawdust thermal conversion. The products included syngas, bio-oil and bio-char. The syngas was analyzed by gas chromatography (GC). Gas chromatography-mass spectrometry (GC-MS) was used to identify the compounds in bio-oils. The water content, higher heating value (HHV) and viscosity of bio-oils were measured. The HHV and composition of bio-char were determined. The results indicated that Mo (3%)-Cu (3%)/HZSM-5 treatment yielded the highest amount of light hydrocarbons, showed a robust ability to convert methane in the syngas to bio-oil, and displayed no significant difference in the properties of bio-char when compared to different treatments in the same pyrolysis conditions.

Library of Congress Subject Headings

Biomass conversion
Biomass energy
Pyrolysis
Catalysis

Description

Includes bibliographical references (pages 63-72)

Format

application/pdf

Number of Pages

83

Publisher

South Dakota State University

Rights

In Copyright - Educational Use Permitted
http://rightsstatements.org/vocab/InC-EDU/1.0/

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