Method for applying a catalyst to a surface of the catalytic combustion burner

Abstract

The present invention is directed to a method for applying a catalyst to the surface of a catalytic combustion burner that allows better distribution of the catalyst on the surface of the end piece of the burner, and thus prevents too high a temperature at the central zone. The present invention is also directed to a catalytic combustion burner which can be coated with a catalyst in accordance with the method of the invention, and to a catalytic combustion bottle adapted to contain a combustible liquid and to receive at its neck a catalytic combustion burner of the invention.

1 . Method for applying a catalyst to the surface of a catalytic combustion burner, said catalytic combustion burner being composed of a porous material and comprising:
 an end piece with an upper part and a lower part, said upper part having a peripheral side wall comprising an inner face delimiting a cavity, an essentially cylindrical outer face, and a crown-shaped upper face, and a sleeve disposed in the extension of said lower part of said end piece, and comprising a cavity adapted to grip a wick intended to convey a combustible composition to the burner,   said method comprising:
 A) a step of impregnating said outer face and, either, said inner face, said crown of the end piece, or said inner face and said crown, with a catalytic composition comprising at least one catalyst belonging to groups  9  or  10  of the Periodic Table of the Elements; 
 B) a step of heat-treating said burner thus impregnated with the catalyst to a temperature Ta of at least 450° C.; 
   said method being characterized in that said catalytic composition is a non-newtonian fluid exhibiting, before application on the end piece, a dynamic viscosity μ c  of at least 15 mPa·s at 20° C.   
     
     
         2 . Method according to  claim 1 , wherein said catalytic composition comprises:
 between 1% and 5% by weight, relative to the total weight of the catalytic composition, of a catalyst selected from metals belonging to groups  9  or  10  of the Periodic Table of the Elements, and between 0.2% and 2% by weight, relative to the total weight of the catalytic composition, of a compound capable of increasing the flow resistance of said catalytic composition.   
     
     
         3 . Method according to  claim 2 , wherein said compound is capable of increasing the flow resistance of a polymer derived from glucose or of a polymer derived from ethylene oxide. 
     
     
         4 . Method according to  claim 1 , wherein the heat-treatment step B) comprises maintaining the temperature at Ta for at least 3 hours. 
     
     
         5 . Catalytic combustion burner coated with a catalyst applied in accordance with the method as defined in  claim 1 . 
     
     
         6 . Catalytic combustion bottle, adapted to contain a combustible liquid and to receive at its neck a catalytic combustion burner which receives a wick immersed in said liquid, characterized in that said bottle is equipped with a burner as defined according to  claim 5 .