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Experimental And Numerical Studies On Pattern Formation In Electrochemical Deposition, Zhenqiu Liu

Doctoral Dissertations

An experimental and theoretical investigation on pattern formation in electrochemical deposition from copper and zinc binary sulfate electrolyte in two dimensional cells was carried out in this study. Aggregates were produced by electrochemical deposition. An interferometric setup was developed to measure the concentration boundary layer around the aggregates produced during growth.

Convection is observed during electrodeposition from binary sulfate solution of zinc and copper with the concentration of 0.04M and higher in horizontal cells. The theoretical and experimental investigation indicates that natural convection is much stronger in a horizontal cell than that in a vertical cell. Channel growth is observed …

Characterization Of Supported Molybdenum Sulfide Catalyst Ex Ammonium Tetrathiomolybdate, Fan Zhang

Doctoral Dissertations

Active sulfide catalysts are conventionally prepared by converting the respective oxides to sulfides. Reductive sulfiding of the oxides is usually difficult and does not proceed in a regular manner. In this dissertation, a supported molybdenum sulfide catalyst prepared by the decomposition of ammonium tetrathiomolybdate (ATTM) in hydrogen and helium was studied. The catalyst is unique in two respects, namely, the lower valence state of the supported molybdenum sulfide catalyst, and the presence of few oxygen atoms in the catalyst. The thiophene hydrodesulfurization (HDS) and propylene hydrogenation (HYD) activities of a catalyst prepared by this technique (and subjected to different pretreatments) …