Drexel University Home Pagewww.drexel.edu DREXEL UNIVERSITY LIBRARIES HOMEPAGE >>

iDEA: Drexel E-repository and Archives > Drexel Theses and Dissertations > Drexel Theses and Dissertations > Synthesis and deposition of adsorbents for gas sensing and catalytic applications

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1215

Title: Synthesis and deposition of adsorbents for gas sensing and catalytic applications
Authors: Bermudez, Jose M.
Keywords: Materials Science;Porous materials;Gases--Absorption and adsorption
Issue Date: 19-Jan-2007
Abstract: Inorganic porous materials are necessary for a wide range of applications such as catalytic systems and sensor technologies. In this thesis, we studied inorganic porous materials whose properties such as thermal stability, specific surface area, and chemical homogeneity that are critical for catalytic oxides and adsorption capacity for gas sensors. In particular, we examined (1) the formation of manganese oxide nanoparticles for catalytic support applications and (2) SiO2-nanolayer deposition on noble-metal surfaces for gas sensing applications. The control of properties is closely related to the processing method. A colloidal coating method is used to enhance specific surface area of alumina-supported manganese oxide. We showed that the presence of alumina increased the specific surface area of manganese oxide 30 times due to the formation of fine rod-shaped manganese-oxide nanoparticles which did not exist in the absence of alumina. The presence of the alumina support altered the pH condition of the precipitation of manganese hydroxide resulting in the change of morphology. For the SiO2-nanolayer deposition on noble metal surfaces, it was found that 3-mercaptopropyltrimetoxysilane (MPS) can be used to modify metallic surface into a silanol layer and promote chemical binding of adsorbents. QCM was used as quantitative measurement for MPS and tetraethyl orthosilicate (TEOS) precursor coatings, offering an accurate measurement of deposited mass by changes of resonance frequency.
URI: http://hdl.handle.net/1860/1215
Appears in Collections:Drexel Theses and Dissertations

Files in This Item:

File Description SizeFormat
Bermudez_Jose.pdf9.67 MBAdobe PDFView/Open
View Statistics

Items in iDEA are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! iDEA Software Copyright © 2002-2010  Duraspace - Feedback