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PROTON-CONDUCTING DENSE CERAMIC MEMBRANES FOR HYDROGEN SEPARATION

CHENG, SHIGAO
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051300176

Abstract Details

2003, MS, University of Cincinnati, Engineering : Chemical Engineering.
Membrane gas separation exhibits dominant advantages over other chemical unit operations. Dense membranes attract great interest among researchers for hydrogen permeation due to their infinite selectivity and high permeability. Palladium based membranes and pervoskite-type protonic conductors represent two important groups in hydrogen separation field cost-effective method to prepare thin (SCTm) membranes. This work introduces a special method of sputtering deposition to synthesize palladium alloy membranes. Pd-Ag thin film was fabricated with a Pd-Ag target while Pd-Cu thin film was synthesized with elemental palladium and copper targets. The sputtering deposition process was optimized, and a new procedure to synthesize multi-component films with elemental targets was developed. The characteristics of Pd-Ag and Pd-Cu membranes were extensively studied and compared. The hydrogen permeation experiments were performed at higher pressures so as to get a better understanding of the hydrogen transport mechanism. Pervoskite-type structured dense membrane of SrCe 0.95 Tm 0.05 O 3 (SCTm) was found to be one of the best proton conductors in our lab. The film thickness was varied from three millimeters to one hundred and fifty microns with the dry-pressing method. The green powder was prepared by the wet chemical method with the precursors of metal nitrates. The particle size of the powder was revealed to be the vital factor in determining the porosity and gas tightness effect of sintered disks. The amount of the target powder determined the thickness of dense layer. The H 2 permeation rates were inversely proportional to the thickness of dense films, which indicated that bulk diffusion rather than surface reaction played a dominant role in H 2 transport through these dense films within the studied thickness range.
Dr. Jerry Lin (Advisor)
126 p.
Engineering, Chemical
proton-conducting; membrane; palladium; strontium cerate; hydrogen separation

Recommended Citations

Citations

  • CHENG, S. (2003). PROTON-CONDUCTING DENSE CERAMIC MEMBRANES FOR HYDROGEN SEPARATION [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051300176

    APA Style (7th edition)

  • CHENG, SHIGAO. PROTON-CONDUCTING DENSE CERAMIC MEMBRANES FOR HYDROGEN SEPARATION. 2003. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051300176.

    MLA Style (8th edition)

  • CHENG, SHIGAO. "PROTON-CONDUCTING DENSE CERAMIC MEMBRANES FOR HYDROGEN SEPARATION." Master's thesis, University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051300176

    Chicago Manual of Style (17th edition)

ucin1051300176
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© 2003, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.