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Title page for etd-0814112-154355


URN etd-0814112-154355 Statistics This thesis had been viewed 1279 times. Download 335 times.
Author He-Chin Chuang
Author's Email Address No Public.
Department Chemical Engineering
Year 2011 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 72
Title Effect of Co-existing Gas on Hydrogen Permeation through Palladium Membrane
Keyword
  • Hydrogen Permeation through Palladium Membrane
  • Hydrogen Permeation through Palladium Membrane
  • Abstract The effect of co-existing gas, including nitrogen, water, methanol and mixture of methanol and water, on hydrogen permeation through palladium membrane has been studied in a semi-bath device. Pure hydrogen permeation experiment was conducted to monitor the activity of the palladium membrane, and regeneration of palladium membrane was also investigated.
       The following mathematical model is adopted for hydrogen permeation through palladium membrane with or without co-existing gas:
      "J=" "β" _"ref" " exp" {" " ("-" "E" _"a " )/"R" (" " "1" /"T" "-" "1" /"T" _"ref"  " " )" " }{("P" _"H" )^"n" "-" (〖"P" _"R" "+P" 〗_"0" )^"n" }"    "                
    where J is hydrogen permeation flux; T is temperature; Tref is reference temperature; βref is permeance at Tref ; Ea is activation energy; PH and P0 are hydrogen partial pressures in retentate and permeate, respectively, PR is the difference of hydrogen partial pressure between retentate and permeate at equilibrium; and n is exponent.
       The parameters in the mathematical model can be obtained from nonlinear data regression. Experimental results show that the deactivation of palladium membrane increases with decreasing temperature. However, the activity can be recovered by treating the membrane tube with pure hydrogen at 633K overnight.
       Experimental results also demonstrate that PR is zero when nitrogen, water, or methanol co-exists .When nitrogen co-exists, besides the decrease in hydrogen partial pressure, hydrogen permeance decreases and the activation energy changes significantly.When methanol co-exists, the hydrogen permeance of gas mixtures with 5, 10 and 15% methanol is only 91, 87 and 83% of that of pure hydrogen, respectively. When water and methanol (molar ratio 1:1) co-exist, the permeance has to be reduced so that the model calculations can agree well with the experimental data.
    Advisor Committee
  • Jan-Chen Hong - advisor
  • Files indicate in-campus access at 2 years and off-campus access at 2 years
    Date of Defense 2012-07-30 Date of Submission 2012-08-14


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