Abstract:
Process for preparing highly active catalysts on the basis of phosphomolybdic acid by preparing a solution of hydrated phosphomolybdic acid in an essentially anhydrous alkyl alcohol, optionally with the addition of a base to the solution, evaporating the solution to prepare a catalyst powder, and final drying and calcining of the powder to form the active catalyst. A further preparation process comprises preparing a solution of hydrated phosphomolybdic acid in an essentially anhydrous alkyl alcohol, evaporation of the solution to prepare a concentrate, impregnating a catalyst support material with the concentrate, bringing the impregnated support into contact with ammonia gas in an amount which is sufficient to form an insoluble precipitate of ammonium alkyl phosphomolybdic acid within the pore structure of the support material, followed by drying and calcining the impregnated support material to form a laminar catalyst.
Abstract:
The invention is the extrusion of sulfur from thiodinitriles to obtain the corresponding dinitrile by heating the thiodinitrile at a temperature of 200 DEG to 700 DEG C. For example, sulfur is extruded from thiodipropionitrile to obtain adiponitrile. This extrusion reaction can be either a strictly thermal reaction employing no other reactant or a reaction conducted in the presence of other gases, liquids or solids.
Abstract:
A method for preparing a molecular sieving metallosilicate which comprises:(A) providing an aqueous dispersion of colloidal particles comprising contiguous mixtures of silica and the oxide of a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co. Ni, Zn, Zr, Y or a mixture of two or more of said metals;(B) mixing an effective amount of a mineralizing agent and/or synthesis directing agent with said dispersion to form a gel; and(C) maintaining said gel at a temperature of 80°C to 300°C for an effective period of time to provide said metallosilicate.
Abstract:
A method for preparing a molecular sieving metallosilicate which comprises:(A) providing an aqueous dispersion of colloidal particles comprising contiguous mixtures of silica and the oxide of a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co. Ni, Zn, Zr, Y or a mixture of two or more of said metals;(B) mixing an effective amount of a mineralizing agent and/or synthesis directing agent with said dispersion to form a gel; and(C) maintaining said gel at a temperature of 80°C to 300°C for an effective period of time to provide said metallosilicate.
Abstract:
A catalyst composition represented by the formula AaFebPcDdOx wherein A is selected Cd, Cr, Ge, Te, Th, Ti, U, V, Zr, rare earths and mixtures thereof; wherein D is selected from Ag, Cu, Mn and mixtures thereof; and wherein a = 0-1.0 b = 0.75-1.5 c = 1.0-2.0 d = 0-2.0 a + d is greater than zero and x is the number of oxygens needed to satisfy the valence requirements of the remaining elements. This catalyst is particularly suitable for the oxydehydrogenation of saturated carboxylic acids, such as isobutyric acid, to form alpha, beta unsaturated carboxylic acids, such as methacrylic acid.