Show simple item record

dc.contributor.authorAbdellaoui, Hamzaen
dc.date.accessioned2014-07-21T13:49:08Zen
dc.date.available2014-07-21T13:49:08Zen
dc.date.issued2013-01-25en
dc.identifier.othervt_gsexam:327en
dc.identifier.urihttp://hdl.handle.net/10919/49617en
dc.description.abstractDirect carbon fuel cell (DCFC) is a high temperature fuel cell (around 700 "C) that produces electrical energy from the direct conversion of the chemical energy of carbon. DCFC has a higher achievable efficiency of 80% compared to other fuel cells and the corresponding CO2 emission is very low compared to conventional coal-burning power plants. Moreover, a DCFC can use diversified fuel resources even waste material, which is advantageous compared to other types of fuel cells which are limited to specific fuels. DCFCs are still under development due to a number of fundamental and technological challenges such as the efficiency of carbon fuels and the effect of impurities on the performance and lifetime of the DCFC. These are key factors for the development and commercialization of these devices. In this study, three biochars obtained from the pyrolysis of poultry litters (PL) collected from Tunisian and US farmers, were characterized to see whether they can be potential anode fuels for DCFC or not. PL biochars have low fixed carbon contents (19-35 wt%) and high ash contents (32.5-63 wt%). These ashes contain around 40 wt% catalytic oxides for carbon oxidation reaction, however, these oxides have very low electrical conductivities, which resulted in the very low (negligible) electrical conductivity of the PL biochars (7.7x10-9-70.56x10-9 S/cm) at room temperature. Moreover, the high ash contents resulted in low surface areas (3.34-4.2 m"/g). These findings disqualified PL biochar from being a potential anode fuel for DCFCs. Chemical demineralization in the sequence HF/HCl followed by carbonization at 950" C of the PL biochars will result in higher fixed carbon content, higher surface area, and higher electrical conductivities. Moreover, the treated PL biochars would contain a potential catalyst (Calcium in the form of CaF2) for carbon oxidation. All these criteria would qualify the treated PL biochars to be potential fuels for DCFC.en
dc.format.mediumETDen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPoultry litter biocharen
dc.subjectDirect Carbon Fuel Cellen
dc.subjectdemineralizationen
dc.subjectcarbonizationen
dc.subjectelectrical conductivityen
dc.titleInvestigation of Poultry Litter Bochar as a Potential Electrode for Direct Carbon Fuel Cellsen
dc.typeThesisen
dc.contributor.departmentBiological Systems Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineBiological Systems Engineeringen
dc.contributor.committeechairZhang, Chenming Mikeen
dc.contributor.committeechairAgblevor, Foster Aryien
dc.contributor.committeememberSenger, Ryan S.en
dc.contributor.committeememberHalouani, Kamelen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record