Multimetal oxide compositions having a two-phase structure and comprising molybdenum, hydrogen, one or more of the elements phosphorus, arsenic, boron, germanium and silicon, and their use for the preparation of methacrylic acid by gas-phase catalytic oxidation.
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A multimetal oxide composition of the formula I [A]p[B]g (I), where A is MO12X1aX2bX3cX4dSeX5fOx B is X612X7gX8hOy X1 is the sum of phosphorus, arsenic, boron, germanium and silicon, X2 is the sum of vanadium, niobium and tungsten, X3 is hydrogen, of which up to 97 mol % is replaced by potassium, ru
A multimetal oxide composition of the formula I [A]p[B]g (I), where A is MO12X1aX2bX3cX4dSeX5fOx B is X612X7gX8hOy X1 is the sum of phosphorus, arsenic, boron, germanium and silicon, X2 is the sum of vanadium, niobium and tungsten, X3 is hydrogen, of which up to 97 mol % is replaced by potassium, rubidium, cesium and/or ammonium (NH4), X4 is the sum of antimony and bismuth, X5 is the sum of rhenium and rhodium, X6 is the sum of molybdenum, tungsten, niobium and tantalum, X7 is the sum of iron, cobalt, nickel, rhodium, ruthenium, magnesium, calcium, strontium, barium, zinc, cadmium, mercury, yttrium, scandium and a rare-earth metal, X8 is the sum of lithium, sodium, potassium, rubidium, cesium and ammonium (NH4), a is from 1 to 6, b is from 0 to 6, c is from 3 to 5, d is from 0 to 6, e is from 0 to 3, f is from 0 to 3, g is from 0.5 to 20, h is from 0 to 4, x and y are numbers determined by the valency and frequency of the elements other than oxygen in formula I, and p and q are numbers other than zero whose ratio p/q is from 12:0.1 to 12:48, which contains portion [A]p in the form of three-dimensionally extended regions A which are separated from their local environment due to their chemical composition which is different from their local environment, and portion [B]q in the form of three-dimensionally extended regions B which are separated from their local environment due to their chemical composition which is different from their local environment, where the regions A and B are distributed relative to one another as in a finely divided mixture of A and B.
Brazdil, James F.; Toft, Mark A.; Seely, Michael J.; Besecker, Charles J.; Gustaferro, Robert A., Attrition resistant mixed metal oxide ammoxidation catalysts.
Diehl,Volker; J채ger,Ulrich; Schr철der,J체rgen; Thiel,Joachim, Cleaning of apparatus in which meth(acrylic) acid-containing organic solvents have been treated and/or generated.
Besecker, Charles J.; Brazdil, Jr., James Frank; Toft, Mark A.; Seely, Michael J.; Gustaferro, Robert A., Process for preparing improved mixed metal oxide ammoxidation catalysts.
Sanjay Chaturvedi ; Anne Mae Gaffney ; Scott Han ; Michele Doreen Heffner ; Ruozhi Song ; Dominique Hung Nhu Le ; Elsie Mae Vickery, Promoted multi-metal oxide catalyst.
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