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
摘要:
The invention relates to a method for producing a metal oxide powder by means of spray pyrolysis, in which a mixture containing ammonia and an aerosol, which is obtained by spraying a solution containing a metal compound by means of an atomizing gas, is introduced into a high temperature zone of a reaction chamber where it is then reacted in an oxygen-containing atmosphere and subsequently, the solid material is separated.
摘要:
Nano-scale yttrium-zirconium mixed oxide powder in the form of aggregated primary particles having the following physico-chemical parameters: - BET surface area: from 40 to 100 m2/g, - dn= from 3 to 30 nm, dn= mean, number-related primary particle diameter, - yttrium content, calculated as yttrium oxide Y2O3, determined by chemical analysis, from 5 to 15 wt.%, based on the mixed oxide powder, - yttrium contents of individual primary particles, calculated as yttrium oxide Y2O3 determined by TEM EDX, corresponding to the content in the powder +-10%, - content at room temperature, determined by X-ray diffraction and based on the mixed oxide powder - monoclinic zirconium oxide from
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines pulverförmigen, porösen kristallinen Metallsilikats, umfassend die folgenden Schritte: a) Hydrothermalsynthese in einem wässrigen Gemisch enthaltend (A) mindestens eine Siliziumquelle, (B) mindestens eine Metallquelle und (C) mindestens einen Mineralisierer unter Erhalt einer wässrigen Suspension enthaltend ein poröses kristallines Metallsilikat als Reaktionsprodukt; und b) Kalzination des Reaktionsproduktes, dadurch gekennzeichnet, dass die Kalzination mittels Flammensprühpyrolyse bei einer adiabaten Verbrennungstemperatur in einem Bereich von 450-2200 °C durchgeführt wird, wobei die in Schritt a) erhaltene Suspension mit einem Feststoffgehalt von ≤ 70 Gew.-% in eine durch Verbrennen eines Brennstoffes in Gegenwart von Sauerstoff erzeugte Flamme versprüht wird unter Bildung eines pulverförmigen, porösen kristallinen Metallsilikats.
摘要:
The invention relates to a method for producing a powdery cathode material comprising at least one mixed oxide containing the following metal components: Li, at least one additional component selected from the group consisting of Mn, Ni and Co. According to said method, an aerosol containing ammonia and metal compounds of the metal components, is reacted in a high temperature zone of a reaction chamber and subsequently, the solid material is separated.
摘要:
The invention relates to iron-silicon-oxide particles in spherical and/or spheroidal form, having two sections, wherein one section substantially comprises amorphous silicon dioxide and the other section substantially comprises iron oxide, characterized in that a) the ratio of silicon dioxide or iron oxide, calculated as Fe 2 O 3 , equals 10 to 90 wt % and b) the iron oxide ratio comprises 5 to 75 wt % of maghemite, 20 to 90 wt % of magnetite, 0 to 15 wt % of hematite, 0 to 5 wt % of beta- Fe 2 O 3.
摘要:
Process for producing surface-modified metal oxide particles, characterized in that a) in a first reaction step, a surface modifier is introduced into a gas stream comprising metal oxide particles, and the resulting reaction mixture is exposed to a temperature of 130 to 250° C for a minimum residence time in the range from 1 to 60 s, and b) in an immediately subsequent, second reaction step, the solid reaction products are removed from the flowing reaction mixture by means of a filter apparatus and the reaction mixture present at the filter is treated at a temperature of 110 to 230° C for a minimum residence time in the range from 1 min to 1 hour.
摘要:
Oxide particles comprising zinc and manganese, - which have a ratio of Zn/Mn of 15 to 300 in atom%/atom%, - in which the proportion of Zn, Mn and O is at least 99% by weight based on the oxide particles, - which are present in the form of aggregated primary particles and have a BET surface area of 5 to 50 m2/g, - in which manganese is present in and on the primary particles, - in which only the signals of zinc oxide are detectable in the x-ray diffractogram. Dispersion comprising the oxide particles. Coating composition and sunscreen comprising the oxide particles.