摘要:
The present invention relates to an agglomerate of at least one particle P which is hydrophobicized on the surface with at least one first surface-active substance and at least one magnetic particle MP which is hydrophobicized on the surface with at least one second surface-active substance, a process for producing it and also the use of these agglomerates.
摘要:
A compound of the general formula (I) AaMbPcOd (I) in which the variables are each defined as follows: M is at least one transition metal selected from Co, Ni, Mn, Fe and Cr, A is Li or LixNa1-x where x is in the range from 0.2 to 1.0, a is in the range from 3.5 to 4.5, b is in the range from 0.8 to 1.2, c is in the range from 1.8 to 2.2 and d is in the range from 7.2 to 8.8.
摘要翻译:通式(I)AaMbPcOd(I)的化合物,其变量各自定义如下:M是选自Co,Ni,Mn,Fe和Cr中的至少一种过渡金属,A是Li或Li x Na 1-x,其中 x在0.2至1.0的范围内,a在3.5至4.5的范围内,b在0.8至1.2的范围内,c在1.8至2.2的范围内,d在7.2至8.8的范围内。
摘要:
The present invention relates to particles which have been modified by a modifier and a dispersion medium comprising the modified particles.The surface-modified metal, metal halide, metal chalcogenide, metal nitride, metal phosphide, metal boride or metal phosphate particles or mixtures thereof have an average particle diameter of from 1 to 500 nm and their surface has been modified by one or more modifiers of the formula (I) (II) and (III)
摘要:
Process for the preparation of modified ZnO particles in which a zinc salt and a base are mixed in a polar solvent and, if appropriate after the precipitation of a precipitation product, the polar solvent is removed and a residue is obtained, where the residue is taken up in a nonpolar solvent, surface-active substances are added, optionally further effect substances are added and then the modified ZnO particles are separated off from further by-products. Materials such as plastics, coatings or paints comprising modified ZnO particles. Methods for the incorporation of modified ZnO particles into materials, where the modified ZnO particles are incorporated into the materials in the form of dispersions or suspensions. Use of modified ZnO particles for protecting material against the effect of light, heat, oxygen or free radicals, as catalysts, for semiconductive films or cosmetic applications.
摘要:
The present invention relates to a Process for the preparation of compounds of general formula (I), Lia-bM1bFe1-cM2cPd-eM3eOx, wherein M1, M2, M3, a, b, c, d and e: M1: Na, K, Rb and/or Cs, M2: Mn, Mg, Ca, Ti, Co, Ni, Cr, V, M3: Si, S, a: 0.8-1.9, b: 0-0.3, c: 0-0.9, d: 0.8-1.9, e: 0-0.5, x: 1.0-8, depending on the amount and oxidation state of Li, M1, Fe, M2, P, M3, wherein compounds of general formula (I) are neutrally charged, comprising the following steps (A) providing a mixture comprising at least one lithium-comprising compound, at least one iron-comprising compound, in which iron has the oxidation state +3, and at least one M1-comprising compound, if present, and/or at least one M2-comprising compound, if present, and/or least one M3-comprising compound, if present, and at least one reducing agent which is oxidized to at least one compound comprising at least one phosphorous atom in oxidation state +5, (B) optionally drying the mixture provided in step (A), in order to obtain a solid compound and (C) calcining the solid compound obtained from step (A) or (B) at a temperature of 300 to 1000° C.
摘要:
A multimetal oxide of the formula I Aga-bMbV2Ox*cH2O, I where M is a metal selected from the group consisting of Li, Na, K, Rb, Cs, Tl, Mg, Ca, Sr, Ba, Cu, Zn, Cd, Pb, Cr, Au, Al, Fe, Co, Ni and/or Mo, a is from 0.3 to 1.9 and b is from 0 to 0.5, with the proviso that the difference (a-b) and c is from 0 to 20 and x is a number determined by the valence and amount of elements different from oxygen in the formula I, which has a crystal structure giving an X-ray powder diffraction pattern which displays reflections at the lattice spacings d of 15.23±0.6, 12.16±0.4, 10.68±0.3, 3.41±0.04, 3.09±0.04, 3.02±0.04, 2.36±0.04 and 1.80±0.04 Å. Precatalysts and catalysts produced therefrom for the partial oxidation of aromatic hydrocarbons are also provided.
摘要:
The present invention relates to methods of producing surface-modified nanoparticulate particles at least of one metal oxide, metal hydroxide and/or metal oxide hydroxide, and aqueous suspensions of these particles. Furthermore, the invention relates to the surface-modified nanoparticulate particles, obtainable by these methods, at least of one metal oxide, metal hydroxide and/or metal oxide hydroxide and aqueous suspensions of these particles, and to their use for cosmetic sunscreen preparations, as stabilizer in plastics and as antimicrobial active ingredient.
摘要:
Catalysts comprising: (a) a support material comprising a component selected from the group consisting of aluminum oxide, silicon dioxide, aluminum silicate, magnesium silicate, titanium dioxide, zirconium dioxide, thorium dioxide, silicon carbide, and mixtures thereof; and (b) an active material comprising a mixture of vanadium (V) and antimony (Sb) and tungsten (W) and/or molybdenum (Mo), and optionally, at least one alkali metal, wherein the vanadium, antimony, tungsten and/or molybdenum and at least one alkali metal are each present in oxidic form; wherein the support material is provided in a form selected from the group of shapes consisting of spherical or approximately spherical and having a diameter of 2 to 10 mm, tubular or rod-shaped and having a diameter of 1 to 10 mm and a length of 2 to 20 mm, granular having a maximum diameter of 2 to 20 mm, and combinations thereof; and wherein the catalyst is diluted with an inert material; along with processes for preparing such catalysts and their use in preparing nitriles via gas phase ammonoxidation.
摘要:
A novel polynary metal oxide phosphate of the general formula I Ma(VO)(P2O7)b(PO4)c is described, in which M is one or more metals selected from V, Ti, Zr, Hf, Cr, Fe, Co, Ni, Ru, Rh, Pd, Cu, Zn, Cd, Hg, B, Be, Mg, Ca, Sr and Ba, a is from 1.5 to 2.5, b is from 0.5 to 1.5, c is from 0.5 to 1.5, having a crystal structure whose powder X-ray diffractogram is characterized by defined reflections. A preferred representative is Fe2VO(P2O7)(PO4). The metal oxide phosphates are suitable as gas phase oxidation catalysts, for example for preparing maleic anhydride from a hydrocarbon having at least four carbon atoms.
摘要:
Methods are disclosed comprising: (a) mixing (i) an aqueous solution of at least one salt of at least one metal selected from the group consisting of aluminum, magnesium, cerium, iron, manganese, cobalt, nickel, titanium, zinc, zirconium and mixtures thereof with (ii) an aqueous solution of at least one polymer, at a pH value of 3 to 13 and at a temperature T1 of 0 to 50° C. to form a mixture; and (b) heating the mixture at a temperature T2 of 60 to 300° C. to form an aqueous suspension of surface-modified nanoparticulate particles comprising at least one compound selected from the group consisting of oxides, hydroxides, and oxide hydroxides of the at least one metal; along with powders prepared therefrom and uses therefore.