0 Replies Latest reply on Oct 19, 2012 5:57 AM by Andres Tretiakov

    Heterogeneous catalysis demo

    Andres Tretiakov

      The wires glow red hot and suddenly a clear blue flame appears.

      This is an example of Heterogeneous Catalysis whereby methanol vapours are oxidised to methanal in air on the surface of the solid catalyst (platinum wires) which in turn releases energy in the form of heat and ignites the excess methanol vapours.

       

       

      The reaction is:

                           Pt catalyst

      2CH3OH + O2         →         2HCHO + 2H2O

      Methanol                          Methanal

      Alcohol                             Aldehyde

       

       

      This particular catalytic lighter is circa 1930. It has very fine platinum wires and black platinum ball that get poisoned very easily if other alcohols are used instead of industrial or laboratory grade methanol. To clean impurities and using it for the first time heat the wires on the methanol flame for a few seconds.

       

      More on catalytic lighters:

      http://www.toledo-bend.com/VCL/articles/index.asp?request=catalytic