Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V VqMoAyOz??I NiMoxByOz???II VNiwMoxCy?Oz???III CoNiwMoxDyOz????IV VNiwCorMoxEyOz????V wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y? is a number from 0 to 10, z, z?, z?, z??, and z?? are determined using the amounts and oxidation states of all cations present in each formula.

Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V

Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V I VqMoAyOz II NiMoxByOz′ III VNiwMoxCy′Oz″ IV CoNiwMoxDyOz′″ V VNiwCorMoxEyOz″″ wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y′ is a number from 0 to 10, z, z′, z″, z′″, and z″″ are determined using the amounts and oxidation states of all cations present in each formula.

Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V

Abstract: This invention concerns catalysts comprising a molybdenum compound of formula (I): VqMoAyOz, (II): NiMoxByOz′, (III): VNiwMoxCy′Oz″, (IV): CoNiwMoxDyOz′″, or (V): VNiwCOrMoxEyOz″″, wherein: A is at least one cation selected from the group consisting of cations of Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of Sb, Al and W; C is at least one cation selected from the group consisting of cations of Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of Ba, Mn, Al, Sb, Sn and W; E is at least one cation selected from the group consisting of cations of Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x, y, y′, z, z′, z″, z′″ and z″″ are as defined in the disclosure. These catalysts can be used in C4 oxidation processes.

Abstract: An improved process for calcination and activation of a catalyst containing mixed oxides of vanadium and phosphorus (V/P/O) involving the addition of spray dried catalyst precursor to a fluidizing oxygen containing gas at a controlled rate such that the temperature is maintained at a range of 370 to 410.degree. C. (preferably 390.+-.5.degree. C.). The catalyst precursor experiences, in addition to rapid temperature rise, dehydration/calcination at this elevated temperature in the fluidized state for an average range of residence time of less than about 4 hours at 3.5 atm of air or above, and up to 20 hours at 1 atm of air while simultaneously and continuously maintaining an average V.sub.ox of 4.55 or less. Such a process is useful in preparing a V/P/O catalyst that exhibits enhanced activity for the oxidation of n-butane to maleic anhydride. The novel process also provides an improved method for start-up of a commercial scale recirculating solids reactor.