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Thesis
Synthesis and deposition of adsorbents for gas sensing and catalytic applications
Master of Science (M.S.), Drexel University
Oct 2005
DOI:
https://doi.org/10.17918/etd-1215
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.
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Details
- Title
- Synthesis and deposition of adsorbents for gas sensing and catalytic applications
- Creators
- Jose M. Bermudez - DU
- Contributors
- Wei-Heng Shih (Advisor) - Drexel University (1970-)Wan Y. Shih (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 1215; 991014632566304721