Abstract/Details

The construction of palladium and palladium-alloy supported membranes for hydrogen separation using supercritical fluid deposition


2004 2004

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Abstract (summary)

The separation of hydrogen from other light gases is of particular importance to the chemical process industry. Membrane based processes offer a cost effective alternative to traditional processing while allowing the combination of separation and reaction in a single unit. Dense palladium or palladium alloy films are a natural choice for hydrogen separation due to their potential infinite selectivity for hydrogen.

In this dissertation we investigated the construction of palladium-based supported hydrogen separation membranes using Supercritical Fluid Deposition (SFD). Compared to other deposition methods, SFD offers an effective metal deposition approach for porous materials due to its high precursor solubility, rapid mass transfer, and lack of surface tension. Three palladium precursors were evaluated for membrane construction in terms of thermal stability, reactivity and surface selectivity. Pd-X (X = Ag, Ni, or Cu) co-depositions were studied to determine the potential of SFD for direct alloy deposition.

Intrinsic to effective membrane construction is the control of membrane location and thickness. Several different reactor and reactants geometries were utilized to control membrane location. An opposed reactants geometry was used to produce sub-surface membranes at controlled depths (80–600 μm) in porous α-alumina. A same-sided reactants geometry was used to produce surface films ranging in thickness from 100 nm to 5 μm on numerous support materials. Membranes were characterized using a variety of techniques including: SEM, XPS, XRD, EPMA, and gas permeation.

Indexing (details)


Subject
Chemical engineering;
Materials science
Classification
0542: Chemical engineering
0794: Materials science
Identifier / keyword
Applied sciences; Hydrogen separation; Membranes; Palladium; Supercritical fluid
Title
The construction of palladium and palladium-alloy supported membranes for hydrogen separation using supercritical fluid deposition
Author
Fisher, Scott M.
Number of pages
238
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Watkins, James J.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3118298
ProQuest document ID
305177046
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305177046
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