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URN etd-0708113-182803 Statistics This thesis had been viewed 1255 times. Download 301 times. Author Erh-Chen Huang Author's Email Address No Public. Department Chemical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 67 Title Study on Periodic Phenomenon of Hydrogen Permeation Flux through Palladium Membrane at Fixed Pressure Difference Keyword Periodic Phenomenon Hydrogen Permeation Palladium Membrane Palladium Membrane Permeation Hydrogen Periodic Phenomenon Abstract Periodic phenomenon of hydrogen permeation flux through palladium membrane at fixed pressure difference has been studied. Semi-batch experiments were conducted to determine the hydrogen flux first. Continuous feed experiments were then conducted at three fixed temperature each with three fixed pressure difference, in order to study the periodic phenomenon of hydrogen flux. In additions, a gas mixture of hydrogen and nitrogen was used to study the effect of co-existing gas.
For the average hydrogen flux at temperature between 603 and 663K and pressure between 1 and 10 bar, model calculations are consistent with experimental data.
In the continuous-feed experiment, although hydrogen fed to the high pressure side was controlled at a constant rate and the pressure was kept constant, the instant hydrogen flux varied periodically. The hydrogen flux oscillates between 92.2% and 109.1% of its average value with long period (132.7s) at low temperature and low pressure. However, it oscillates between 95.2% and 105.2% of its average value with short period (38.3s) at high temperature and high pressure.
For the periodic phenomenon, we proposed that hydrogen might permeate through the palladium membrane with two ways: 1. Most (92~95%) of the hydrogen permeate rapidly through palladium membrane by adsorption-diffusion mechanism without oscillation; and 2. The rest (5~8%) of the hydrogen permeate periodically through palladium membrane in molecular form similar to that for Y gas in the mixture of H2+Y. Since hydrogen permeates through palladium membrane with both ways mentioned above, the total hydrogen flux changed periodically around its average value.
The experimental results of gas mixture show that the effect of co-existing gas on period and amplitude of hydrogen flux is insignificant.
Advisor Committee Jan-Chen Hong - advisor
Files Date of Defense 2013-06-26 Date of Submission 2013-07-09