METHOD FOR PRODUCING TUNGSTEN OXIDE AND MIXED TUNGSTEN OXIDES

摘要

Process for producing a tungsten oxide powder or a tungsten mixed oxide powder of general formula MxWO3, wherein M = Na, K, Rb, Li and/or Cs, 0.1 ≤ x ≤ 0.5, comprising the consecutive steps of: a) providing a solution containing in each case at least one tungsten compound and optionally at least one M-containing compound in a concentration corresponding to the stoichiometry MxWO3, b) atomizing the solution to form an aerosol into a reaction space, c) reacting the aerosol in the reaction space with a hydrogen/oxygen flame for which 1 O2,primary/0.5H2≤ 3 applies, wherein the reaction space is configured such that it comprises two reaction zones with two different speeds v1 and v2 of the reaction mixture where v2= 0.3-0.8 v and 0.5 ≤v≤ 10 Nm/s, d) separating the solid from vaporous or gaseous substances and e) passing a reducing gas stream over the separated solid at a temperature of 450-700°C. Process for producing a tungsten oxide powder or a tungsten mixed oxide powder of general formula MxWO3, wherein M = Na, K, Rb, Li and/or Cs, 0.1 ≤ x ≤ 0.5, comprising the consecutive steps of: a) providing a solution containing in each case at least one tungsten compound and optionally at least one M-containing compound in a concentration corresponding to the stoichiometry MxWO3, b) atomizing the solution to form an aerosol into a reaction space, c) reacting the aerosol in the reaction space with a hydrogen/oxygen flame with 2 lambda 1, wherein lambda = total oxygen/0.5 x hydrogen, d) separating the solid from vaporous or gaseous substances.