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  • Other Sources  (3)
  • Inorganic, Organic and Physical Chemistry  (2)
  • Chemistry and Materials (General)  (1)
  • 2005-2009  (3)
  • 2008  (3)
  • 1
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    Stabilized tin-oxide-based oxidation/reduction catalysts (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The invention described herein involves a novel approach to the production of oxidation/reduction catalytic systems. The present invention serves to stabilize the tin oxide reducible metal-oxide coating by co-incorporating at least another metal-oxide species, such as zirconium. In one embodiment, a third metal-oxide species is incorporated, selected from the group consisting of cerium, lanthanum, hafnium, and ruthenium. The incorporation of the additional metal oxide components serves to stabilize the active tin-oxide layer in the catalytic process during high-temperature operation in a reducing environment (e.g., automobile exhaust). Moreover, the additional metal oxides are active components due to their oxygen-retention capabilities. Together, these features provide a mechanism to extend the range of operation of the tin-oxide-based catalyst system for automotive applications, while maintaining the existing advantages.
    Keywords: Inorganic, Organic and Physical Chemistry
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    NASA TECHNICAL REPORTS
  • 2
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    Surface Analysis of 4-Aminothiophenol Adsorption at Polycrystalline Platinum Electrodes (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Formation of self-assembled monolayer (SAM) of 4-aminothiophenol (4-ATP) on polycrystalline platinum electrodes has been studied by surface analysis and electrochemistry techniques. The 4-ATP monolayer was characterized by cyclic voltammetry (CV), Raman spectroscopy, reflection absorption infrared (RAIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) experiments give an idea about the packing quality of the monolayer. RAIR and Raman spectra for 4-ATP modified platinum electrodes showed the characteristic adsorption bands for neat 4-ATP indicating the adsorption of 4-ATP molecules on platinum surface. The adsorption on platinum was also evidenced by the presence of sulfur and nitrogen peaks by XPS survey spectra of the modified platinum electrodes. High resolution XPS studies and RAIR spectrum for platinum electrodes modified with 4-ATP indicate that molecules are sulfur-bonded to the platinum surface. The formation of S-Pt bond suggests that ATP adsorption gives up an amino terminated SAM. Thickness of the monolayer was evaluated via angle-resolved XPS (AR-XPS) analyses. Derivatization of 4-ATP SAM was performed using 16-Br hexadecanoic acid.
    Keywords: Chemistry and Materials (General)
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    NASA TECHNICAL REPORTS
  • 3
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    In-situ Thermal Treatment of Trichloroethene at Marshall Space Flight Center (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This viewgraph presentation describes the in-situ thermal treatment of trichloroethene at Marshall space Flight Center. The contents include: 1) Background 1 and 2; 2) Source Area-13; 3) In-situ Thermal Treatment; 4) SA-13 Lithology; 5) SA-13 In-Situ Thermal TS; 6) SA-13 ISTD System Components; 7) ISTD Overview; 8) Heaters; 9) SA-13 ISTD Wellfield Layout; 10) SA-13 Well Field; 11) ISTD Process and Instrumentation; 12) Treatment Zone Temperature; 13) SA-13 System Removals; 14) SA-13 DNAPL (typical photos); 15) Treatment Results 1-5; and 16) SA-13 TCE Removal Summary.
    Keywords: Inorganic, Organic and Physical Chemistry
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    NASA TECHNICAL REPORTS
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