The acetic acid-ammonium acetate methods of catalyst rejuvenation by lead removal have been of considerable interest. The effectiveness of these methods was therefore investigated in the laboratory as a function of temperature, duration of treatment, type of agitation, and cation, using mainly catalyst samples poisoned by treatment with a lead acetate solution, with confirmation by vehicle-aged catalyst samples. The results have, in general, been encouraging. For instance, washing of poisoned catalyst samples with 10 wt % acetic acid solution at room temperature for half an hour was sufficient to improve the hydrocarbon conversion of a catalyst poisoned with 5 wt % Pb (typical of a catalyst aged for about 50,000 miles with fuel containing 0.03 g Pb/gl) by 15%. However, we found that such a rejuvenated catalyst, if subjected to a laboratory repoisoning test with 0.03 g Pb/gl fuel, loses hydrocarbon activity rapidly. The rate of activity loss upon repoisoning appears to be about 6 times faster than the average loss rate experienced before the rejuvenation treatment. On the other hand, a poisoned catalyst sample which was rejuvenated by a more drastic treatment (e.g. two treatments for 3 hrs each, at 195°F with ultrasonic agitation), appeared to have the same rate of activity loss upon further aging as a fresh catalyst after the initial aging. This study also showed that there is no significant difference in rejuvenation effectiveness among acetic acid or ammonium acetate at the same concentration.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Rejuvenation of Lead-Poisoned Noble Metal Catalysts


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    1976 Automotive Engineering Congress and Exposition ; 1976



    Erscheinungsdatum :

    01.02.1976




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Rejuvenation of Lead-Poisoned Noble Metal Catalysts

    Rothschild,W.G. / Ford Motor,US | Kraftfahrwesen | 1976


    Non-noble metal fuel cell catalysts

    Chen, Zhongwei ;Dodelet, Jean-Pol ;Zhang, Jiujun | TIBKAT | 2014


    Noble Metal Recovery from Spent Automotive Catalysts

    D’Aniello, Michael J. | SAE Technical Papers | 1982


    Noble Metal Recovery from Spent Automotive Catalysts

    DAniello,M.J. / General Motors Res.Lab.,US | Kraftfahrwesen | 1982


    Software Rejuvenation Model Based on Reconfiguration and Periodical Rejuvenation

    Du, X. / Qi, Y. / Hou, D. | British Library Online Contents | 2010