摘要:
A process for preparing a catalyst useful for producing a nitrile by a gas phase catalytic oxidation reaction of an alkane with ammonia, which comprises drying a solution or slurry containing molybdenum, vanadium and tellurium by a spray drying method or a freeze-drying method and heat-treating the resulting dried product.
摘要:
A catalyst for the production of a nitrile from an alkane, which satisfies the following conditions 1 and 2:1 the catalyst is represented by the empirical formula:Mo.sub.a V.sub.b Te.sub.c X.sub.x O.sub.n (1)wherein X is at least one element selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B and Ce,when a=1,b=0.01 to 1.0,c=0.01 to 1.0,x=0.01 to 1.0,and n is a number such that the total valency of the metal elements is satisfied; and2 the catalyst has X-ray diffraction peaks at the following angles of 2.theta. in its X-ray diffraction pattern:Diffractionangles of 2.theta. (.degree.)22.1.+-.0.328.2.+-.0.336.2.+-.0.345.2.+-.0.350.0.+-.0.3.
摘要:
A process for producing a nitrile, which comprises subjecting an alkane and ammonia in the gaseous state to catalytic oxidation in the presence of a catalyst which satisfies the following conditions of (1) and (2):(1) the catalyst is represented by the empirical formula:Mo.sub.a V.sub.b Te.sub.c X.sub.x O.sub.n (1) wherein X is at least one element selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B and Ce,______________________________________ when a = 1, b = 0.01 to 1.0, c = 0.01 to 1.0, x = 0.01 to 1.0, ______________________________________ and n is a number such that the total valency of the metal elements is satisfied; and(2) the catalyst has X-ray diffraction peaks at the following angles of 2.theta. in its X-ray diffraction pattern:______________________________________ Diffraction angles of 2.theta. (.degree.) ______________________________________ 22.1 .+-. 0.3 28.2 .+-. 0.3 36.2 .+-. 0.3 45.2 .+-. 0.3 50.0 .+-. 0.3. ______________________________________
摘要:
A method for a gas phase catalytic oxidation reaction of a hydrocarbon, which comprises: subjecting an alkane having a carbon number ranging from 3 to 8 and/or an alkene having a carbon number ranging from 2 to 8 to a gas phase catalytic oxidation reaction to produce a vapor phase oxidation product in the presence of a mixed metal oxide catalyst, wherein the reacion is conducted in the presence of particles substantially inert to the reaction in an amount within a range of the same amount as the amount of catalyst to 99 wt. % in all particles.
摘要:
A process for producing a nitrile, which comprises subjecting an alkane and ammonia in the gaseous state to catalytic oxidation in the presence of an oxide of the formula:Mo.sub.a V.sub.b Te.sub.c Nb.sub.d X.sub.x O.sub.n ( 1)wherein X is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Tl, In, Ti, Zr, Hf, Ta, Cr, Mn, W, Fe, Ru, Co, Rh, Ni, Pd, Pt, Zn, Sn, Pb, As, Sb, Bi, La and Ce,when a=1,b=0.01 to 1.0,c=0.01 to 1.0,d=0 to 1.0, andx=0.0005 to 1.0,and n is a number such that the total valency of the metal elements is satisfied.
摘要:
A method for producing a nitrile by a gas phase catalytic oxidation reaction of an alkane with ammonia in the presence of a catalyst, which comprises supplying the alkane and ammonia to an upper stream inlet of the catalyst layer, and separately supplying at least a part of the total amount of ammonia to a downstream position of the catalyst layer located downstream from the upper stream inlet of the catalyst layer.
摘要:
A method for the production of maleic anhydride in which a hydrocarbon of 4 to 6 carbon atoms is subjected to a vapor phase catalytic oxidation reaction in the presence of a metal oxide catalyst, characterized in that the metal oxide catalyst includes a metal oxide containing Mo, V, Te and X (X representing one or more elements selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B, In, P and Ce) as constituent elements thereof, and the proportion of Mo to the total metal elements in the metal oxide is 0.25 or greater in terms of the atomic ratio, and the atomic ratio of each of the other constituent elements V, Te and X with respect to Mo is in the range of 0.01-1.0.According to the method, the object maleic anhydride may be produced at a high yield using a hydrocarbon of 4 to 6 carbon atoms, particularly n-butane, as the starting material.
摘要:
An LED drive device whose power dissipation can be effectively reduced without halting current supply to an LED row as well as an LED illuminating device with the LED drive device incorporated therein. When an LED 21A making up an LED row 3A has developed a short-circuit fault, a voltage corresponding to a forward voltage which has been applied to the faulty LED 21A is impressed additionally to an FET 31A for electric power consumption thereof to increase to not less than a certain value. At this time, a power limiting circuit 6A varies a potential, being a reference value of a constant current circuit 7A, at a connecting point between voltage dividing resistors 46A, 47A and then continues to supply a certain level of a current IF1 to the LED row 3A so as to keep the remaining fault-free LEDs 22A to 26A lighting. Consequently, in the event of a short-circuit fault of the LED 21A, the adverse effect caused by discontinuing the current supply to the LED row 3A can be swept away.
摘要:
A light emitting element drive device includes a light emitting unit that includes a light emitting element and that performs dimming based on a pulse width modulation (PWM) signal, a first switching element that is turned ON or OFF based on the PWM signal and that is connected in series to the light emitting unit, and a protection circuit that includes a charging circuit and a second switching element. The second switching element is turned ON when a first voltage obtained by a charging operation of the charging circuit is equal to or more than a first predetermined value. The charging circuit discharges electric charge through the first switching element when a second voltage between input and output terminals of the first switching element drops. The first switching element is turned OFF despite the existence of the PWM signal when the second switching element is turned ON.
摘要:
The object is to provide an exhaust gas reduction catalyst that exhibit high nitrogen oxide reduction performance, and to provide a simple and efficient method for producing the catalyst, in which the amount of the waste liquid is reduced, further, an object of the invention is to provide a zeolite-containing catalyst for reducing nitrogen oxides, which does not use an expensive noble metal or the like and which has high nitrogen oxide reduction performance. The present invention relates to a catalyst for reducing nitrogen oxides, which comprises: zeolite at least containing an aluminium atom and a phosphorus atom in the framework thereof; and a metal supported on the zeolite, wherein a coefficient of variation of intensity of the metal is at least 20%, when performing an elemental mapping of the metal in the catalyst with an electron probe microanalyzer, and, a catalyst for reducing nitrogen oxides, which comprises the zeolite containing at least a silicon atom, a phosphorus atom and an aluminium atom, and having an adsorption retention rate of at least 80% in a water vapor cyclic adsorption/desorption test at 90° C.