Thesis (M.S.)--Villanova University, 2006. / Chemistry Dept. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [233]-241).

No description available.

Thesis (M.S.)--Ohio University, 2002. / Title from PDF t.p.

Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 135-141).

Current state-of-the-art fuel cells depend on relatively high quantities of platinum metal to function. For fuel cells to become economically feasible as a replacement for the internal combustion engine there needs to be a drastic reduction in the quantity of platinum used within them. ACAL Energy has developed a fuel cell that allows for an 80 % reduction in the quantity of platinum required. This is achieved by replacing the solid supported cathode with an aqueous catholyte solution that contains within it a non-precious metal catalyst. The work contained in this thesis explores a library of non-heme metal complexes as potential candidates for use as catalysts for the 4 electron oxygen reduction reaction at the cathode of the FlowCath® fuel cell. The catalysts chosen, Fe(II) TPEN, Fe(II) TRILEN and Fe(II) TPTCN, are super oxidise dismutase mimics and are known to effectively reduce oxygen in a homogeneous solution. These catalysts were studied in fuel cell-like conditions to gain an understanding of their effectiveness in reducing oxygen. Attempts to decorate the complexes with sulfonate groups led to the evolution of the isoquinoline-based complexes. The change from pyridine-based complexes to isoquinoline-based complexes led to the formation of six alternative complexes, Fe(II) 1-miq TQEN, Fe(II) 3-miq TQEN, Fe(II) 1-miq TRILEN, Fe(II) 3-miq TRILEN, Fe(II) 1-miq TQTCN and Fe(II) 3-miq TQTCN, four of which (1-/3-miq TRILEN and 1-/3-TQTCN) are new to the academic literature. These complexes were analysed for their use as catalysts in the oxygen reduction reaction. In addition to the synthetic and analytical work carried out, computational models of the complexes were created. This theoretical data gave a deeper insight into the molecular structure of the complexes studied and the spin states of the Fe(II) and Fe(III) species.

Thesis (M.S.)--University of Wisconsin--Madison, 1983. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 129-132).

Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Bibliography: leaves 483-489. / by George Albert Huff, Jr. / Sc.D.

This thesis describes results of a study aimed at developing and evaluating attrition resistant iron catalysts prepared by spray drying technique. These catalysts are intended for Fischer-Tropsch (F-T) synthesis in a slurry bubble column reactor (SBCR). One of the major challenges associated with the use of SBCR for this purpose is the problem of catalyst/wax separation. If the catalyst particles break up into smaller ones during the F-T synthesis, these small particles (>5-10 m in diameter) will cause problems with the catalyst/wax separation. Several research groups have worked on development of attrition resistant spray-dried iron catalysts, and methodology to measure and predict their attrition behavior. However, these attrition tests were not conducted under conditions representative of those encountered in a SBCR. In this work, the attrition behavior of six spray-dried catalysts and two precipitated catalysts was evaluated under slurry reaction conditions in a stirred tank slurry reactor (STSR). Spray-dried catalysts used in this study were prepared at Texas A&M University (TAMU) and at Hampton University (HU), employing different preparation procedures and silica sources (potassium silicate, tetraethyl orthosilicate or colloidal silica). The attrition properties of F-T catalysts were determined by measuring particle size distribution (PSD) of catalysts before and after F-T synthesis in the STSR. This provides a direct measure of changes in particle size distribution in the STSR, and accounts for both physical and chemical attrition effects. Also, scanning electron microscopy (SEM) was used to investigate the mechanism of attrition - erosion vs. fracture, and to obtain morphological characteristics of catalysts. Spray dried 100Fe/3Cu/5K/16SiO2 catalyst (WCS3516-1), prepared from wet precursors using colloidal silica as the silica source, was the best in terms of its attrition strength. After 337 hours of F-T synthesis in the STSR, the reduction in the average particle size and generation of particles less than 10 m in diameter were found to be very small. This indicates that both particle fracture and erosion were insignificant during testing in the STSR. All other catalysts, except one of the spray dried catalysts synthesized at Hampton University, also had a good attrition resistance and would be suitable for use in slurry reactors for F-T synthesis.

Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 198-215). Also available on the Internet.