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  • 1
    Electronic Resource
    Electronic Resource
    Effects of alkaline earths and rare earths added to sol-gel alumina on the thermostability and the oxidation activity of the mixed alumina-supported Pt catalysts (1995)
    Springer
    Catalysis letters 32 (1995), S. 139-145 
    Details
    ISSN: 1572-879X
    Keywords: alumina ; carbon monoxide oxidation ; ethylene oxidation ; platinum ; cerium ; sol-gel ; thermostability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Various alumina-based supports were prepared by adding metal elements such as alkaline and rare earths to sol-gel alumina synthesized from aluminium isopropoxide using 2-methylpentane-2,4-diol as a solvent and the influence of the additives on the thermostability of the supports was investigated. It was found that Ba and Sr are the most effective in improving the thermostability of the alumina, La is moderately effective while Zr, Mg and Ca are ineffective. The influence of the additives on the catalytic activities of Pt/CeO x /MO y -Al2O3 (M=Ba, Sr, La) after the calculation at 1273 K was also investigated. Pt/CeO x /BaO-Al2O3 and Pt/ CeO x /La2O3-Al2O3 showed higher catalytic activity than Pt/CeO x /Al2O3, while Pt/CeO x / SrO-Al2O3 showed lower catalytic activity. The activity order was Ba 〉 La = none 〉 Sr in terms of CO and C2H4 oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806109
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of preparation method of CeOx-Al2O3 on the thermostability and activity of the monolith supported Pt-Rh catalysts for automotive exhaust control (1995)
    Springer
    Catalysis letters 33 (1995), S. 229-235 
    Details
    ISSN: 1572-879X
    Keywords: support ; cerium ; alumina ; sol-gel ; thermostability ; platinum ; three-way catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Various CeOx-Al2O3 powders were prepared and the influence of the method of support preparation on the thermostability of the mixed alumina-supported Pt catalysts and on their oxidation of CO was investigated. It was found that the complexing agent-assisted sol-gel method is effective in improving the thermostability of the mixed alumina-supported Pt catalysts. Monolith Pt-Rh three-way catalysts were prepared using these aluminas and other thermostable alumina including Ba. Activity of the catalysts was also investigated after conducting accelerated thermal engine aging in order to test their durability. Under normal operating conditions of the automobile engine, the activity of the Pt-Rh three-way catalyst using the CeOx-Al2O3 support prepared by the complexing agent-assisted sol-gel method is nearly equal to that of the catalyst using the CeOx impregnated onto BaO-Al2O3 powder prepared by the same sol-gel method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814227
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    Paper (German National Licenses)
    Fulltext
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