在H2+Y混合氣中氫氣滲透鈀膜之研究

Permeation of Hydrogen in a Gas Mixture of H2+Y through Palladium Membrane

梁書懷(Shu-Huai Liang)

指導教授 ： 洪賑城

大同大學/工程學院/化學工程學系所/碩士(2008年)

摘要

本研究利用已有之半批次裝置(Semi-batch Device)，進行純氫、氫氣與氦氣混合氣、氫氣與二氧化碳混合氣、氫氣與氮氣混合氣之氫氣滲透鈀膜管實驗。本裝置僅需進行單次實驗即可於設定溫度內測得廣大壓力範圍之氫氣滲透鈀膜管數據，並將此數據透過壓力轉換器與相關之資料擷取卡以及LabVIEW操控介面軟體，紀錄於個人電腦中。
本研究成功利用Hong and Lin所發展之數學模式推算純氫及混合氣中氫氣滲透鈀膜之滲透通量。在五個不同溫度下純氫之滲透實驗以數學模式做數據回歸之相對平均誤差值皆小於1%。顯示實驗數據與數學模式之計算值吻合度相當高，並證實氫氣滲透通量與高、低壓端氫氣分壓n次方之差有關，且n值介於0.5與1.0之間。實驗顯示，當混合氣中含有二氧化碳時，在實驗終點氫氣滲透量為零時，高壓端之氫氣分壓仍高於低壓端之氫氣分壓，此值為Pr，且其值隨CO2分壓及溫度上昇而增大。顯示高壓端之CO2影響H2在鈀膜上之分解吸附。然而，當混合氣中含有氦氣或氮氣時，Pr不存在，且其滲透通量可由純氫之滲透通量推算，顯示高壓端之He或N2不影響H2在鈀膜上之分解吸附。

關鍵字

氫氣滲透 ； 鈀膜

並列摘要

In this study a semi-batch device has been used to study from the hydrogen permeation through palladium membrane from pure hydrogen and a mixture of hydrogen and helium, nitrogen or carbon dioxide. The semi-batch device was made of stainless steel cylinder with a hydrogen-permeable palladium membrane tube. The signals of pressure and temperature of the device and volume signal of permeated hydrogen were acquired and recorded in a personal computer. The device can be used to test the hydrogen permeation in a wide range of pressure by a single experimental run for a desired temperature.
The hydrogen permeation flux from pure hydrogen or gas mixture has been successfully estimated, using the mathematical model by Hong and Lin. The average relative error between experimental data and model calculations are less than 1% for experiments at 5 different temperatures. This indicates the mathematical model agrees well with the experiment data, and proves that hydrogen permeation flux is proportional to the difference of the n-th order of pressure between high and low pressure sides, where n is in between 0.5 and 1.0. Experimental results of gas mixture of hydrogen and carbon dioxide show that, at the end of experiment when hydrogen permeation flux is zero, the hydrogen partial pressure at the high pressure side is higher that at the low pressure side by a value of Pr. This value increases with increasing temperature and carbon dioxide partial pressure, indicating carbon dioxide at high pressure side influences the dissociative adsorption of hydrogen on Pd membrane.
On the other hand, when gas mixture of hydrogen and helium or nitrogen is used, Pr does not exist, and the hydrogen permeation flux can be estimated with heat for pure hydrogen, indicating helium or nitrogen in high pressure side does not affect the dissociative adsorption of hydrogen on Palladium membrane.

並列關鍵字

palladium ； hydrogen

參考文獻

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