Catalyst from flame-spray pyrolysis and catalyst for autothermal propane dehydrogenation

Abstract

The invention relates to a method of production of catalyst particles, comprising platinum and tin and also at least one further element, selected from lanthanum and cesium, on zirconium dioxide as support, comprising the steps: preparation of one or more solutions containing precursor compounds of Pt, Sn and at least one further element of La or Cs and also ZrO 2 , converting the solution(s) to an aerosol, bringing the aerosol into a directly or indirectly heated pyrolysis zone, carrying out pyrolysis, and separation of the particles formed from the pyrolysis gas. Suitable precursor compounds comprise zirconium(IV) acetylacetonate, lanthanum(II) acetylacetonate and cesium acetate, hexamethyldisiloxane, tin 2-ethylhexanoate, platinum acetylacetonate, zirconium(IV) propylate in n-propanol and lanthanum(II) acetylacetonate. The invention also relates to the catalyst particles obtainable using the method according to the invention, and to the use thereof as dehydrogenation catalysts.

1 - 17 . (canceled) 
     
     
         18 . A catalyst particle, comprising platinum and tin and also at least one further element, selected from lanthanum and cesium, on a support comprising zirconium dioxide and optionally silicon oxide, wherein said catalyst particle is obtained by a method comprising the steps
 (i) preparing one or more solutions containing precursor compounds of platinum, tin and the at least one further element, selected from lanthanum and cesium, and also of zirconium dioxide and optionally silicon dioxide,   (ii) converting the solution(s) to an aerosol,   (iii) bringing the aerosol into a directly or indirectly heated pyrolysis zone,   (iv) carrying out pyrolysis with a gas, and   (v) separating the catalyst particles formed from the pyrolysis gas.   
     
     
         19 . The catalyst particle of  claim 18 , wherein said catalyst particle contains 0.05 to 1 wt. % Pt and 0.05 to 2 wt. % Sn. 
     
     
         20 . The catalyst particle of  claim 18 , wherein said catalyst particle has a specific surface of 36 to 70 m2/g. 
     
     
         21 . The catalyst particle of  claim 18 , wherein said catalyst particles comprises 30 to 99.5 wt. % ZrO 2  and 0.5 to 25 wt. % SiO 2  as support, and 0.1 to 1 wt. % Pt, 0.1 to 10 wt. % Sn, relative to the mass of the support, La and/or Cs, wherein at least Sn and at least La or Cs are contained.