THESIS
2001
xiv, 145, [61] leaves : ill. ; 30 cm
Abstract
Preparation of palladium membrane by electroless plating in both hypophosphite-based and hydrazine-based plating bath were investigated. The electroless plating kinetics of palladium onto seeded supports have been determined, and a simple kinetic model was developed. Further investigation of plating chemistry of Pd-Ag co-deposition was done in a hydrazine-based plating bath containing both palladium and silver precursors. The electroless plating kinetics have been determined for co-deposition of palladium and silver from the mixed plating bath. Mathematical model has been developed to predict the film thickness, plating rate and composition profile as a function of plating parameters (i.e., reactant concentrations and time). The evolution of film microstructure and composition during el...[
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Preparation of palladium membrane by electroless plating in both hypophosphite-based and hydrazine-based plating bath were investigated. The electroless plating kinetics of palladium onto seeded supports have been determined, and a simple kinetic model was developed. Further investigation of plating chemistry of Pd-Ag co-deposition was done in a hydrazine-based plating bath containing both palladium and silver precursors. The electroless plating kinetics have been determined for co-deposition of palladium and silver from the mixed plating bath. Mathematical model has been developed to predict the film thickness, plating rate and composition profile as a function of plating parameters (i.e., reactant concentrations and time). The evolution of film microstructure and composition during electroless plating has also been investigated. Hydrogen permeation study has demonstrated that Pd-Ag alloy membrane has superior performance compared to a pure palladium membrane of similar thickness. In addition, the formation of single-phase alloy results in substantial enhancement in hydrogen permeation rate. Hydrogen separation from Towngas mixture was also studied, 99% pure hydrogen stream was obtained.
Hydrogen production from methane partial oxidation in both conventional fixed-bed reactor and packed-bed membrane were compared in various flowrate and CH
4/O
2 feed ratios. H
2/CO was found higher than the theoretical value. Although poorer conversion was obtained in PBMR, it encourages safer operating conditions.
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