Nitto Chemical Industry Co., Ltd.

Mitsubishi Rayon Company, Limited

Dia-nitrix Co., Ltd.

Kunio Mori

Yutaka Sasaki

Kiyoshi Moriya

Yoshimi Nakamura

Kenichi Miyaki

Hiroshi Utsumi

Hirokazu Watanabe

Akimitsu Morii

Hiroshi Yamamoto

Koichi Mizutani

Toshio Nakamura

Seiichi Kawato

Motoo Yanagita

Yutaka Kiyomiya

Kazuo Morishita

Kouichi Mizutani

Miki Kunitani

Mikio Noda

Yuichi Tagawa

Takao Shimizu

Ken Ohyachi

An ammoxidation catalyst comprising a molybdenum (component (1)), bismuth (component (2)), at least one element selected from the group consisting of nickel, cobalt, zinc, magnesium, manganese and copper (component (3)) and at least one element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium (component (4)), over which an organic compound is subject to ammoxidation which is a composite oxide fluid bed catalyst, is prepared by i) preparing a first solution that comprises at least a portion of component (1), at least a portion of component (2), and at least a portion of component (3) but none of component (4); ii) preparing a second solution by adding a solution of component (4) to the first solution; and iii) drying the second solution obtained and calcining the solid matter obtained from the drying step.

Method for producing ammoxidation catalyst

A process for producing a molybdenum-bismuth-iron-containing metal oxide fluidized bed catalyst which has a controlled particle diameter and has satisfactory activity and physical properties. In a process for producing a fluidized bed catalyst containing molybdenum-bismuth-iron and silica as a carrier component, dried products formed in a spray drying step and having a particle diameter outside a desired range are pulverized, then the pulverized one is mixed into a slurry before spray drying, the resulting mixture is spray-dried, and the spray-dried particles are subjected to a classification operation to obtain particles having a diameter within the desired range, which are then calcined. The catalyst produced according to the present invention is suitable for producing acrylonitrile by ammoxidation of propylene.

Molybdenum-bismuth-iron-containing metal oxide catalysts for fluidized layer, method for preparation thereof, and use thereof

For the production of acrylonitrile by ammoxidation of propylene, there is provided a catalyst capable of giving a high yield for a long period of time. In producing acrylonitrile by ammoxidation of propylene, there is used a metal oxide as a catalyst, which metal oxide contains iron, antimony, molybdenum, bismuth, potassium, an F element, a G element, an H element and silica as essential components in a specific composition ratio, and in which metal oxide iron antimonate exists as a crystal phase, provided that the F element is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, manganese, cobalt, nickel, copper, silver, zinc and cadmium, the G element is at least one element selected from the group consisting of chromium, aluminum, gallium and indium, and the H element is at least one element selected from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium and samarium.

Method for producing acrylonitrile, catalyst for use therein and method for preparing the same

A method for regeneration of a molybdenum-containing oxide fluidized bed catalyst which comprises impregnating a fluidized catalyst of a metal oxide containing molybdenum, bismuth and iron which has been deteriorated by being used for a reaction in production of acrylonitrile by ammoxidation of propylene, with a solution of a molybdenum compound and a solution of at least one compound containing at least one element selected from the group consisting of iron, chromium, lanthanum and cerium which are prepared separately or with a previously prepared mixed solution of the above compounds, drying the resulting catalyst and, then, firing the catalyst at a temperature of 500-700&deg; C.

Method for regenerating molybdenum-containing oxide fluidized-bed catalyst

Catalyst for producing unsaturated nitrile

In the gas phase oxidation of an organic compound, using a metallic oxide fluidized-bed catalyst that contains molybdenum in an amount of 10% by weight or more, bismuth, and at least an element selected from the group consisting of iron and cerium, when tellurium is incorporated into this catalyst in such an amount that the atomic ratio of the tellurium to the molybdenum is (0.05-1.5):10, the catalytic activity can be retained for a prolonged period of time, and, at the same time, the loss of molybdenum and tellurium can be prevented during the oxidation reaction.

Retention of activity of molybdenum-containing metallic oxide catalyst

There is provided a process for producing a particulate iron-antimony containing oxide composition having high compressive strength, comprising the steps of: providing an aqueous slurry containing iron ions, nitrate ions and antimony trioxide; adjusting the slurry to a pH value in the range of 0.5 to 3 as measured at 40.degree. C.; heating the slurry; spray-drying the heated slurry; and calcining the resultant particles.

Process for producing particulate iron-antimony containing oxide

A process for conducting long-term ammoxidation of propylene in the presence of a metal oxide catalyst for ammoxidation of propylene at a temperature of from 300.degree. C. to 500.degree. C. to produce acrylonitrile and hydrogen cyanide, wherein in the process each of (A) elemental phosphorus or a phosphorus compound and (B) elemental tellurium or a tellurium compound is added as a regenerating agent at least once to the ammoxidation reaction system in accordance with the progress of the reaction, the regenerating agent (A) being added when the yields of both of acrylonitrile and hydrogen cyanide are reduced, and the regenerating agent (B) is chosen when the yield of acrylonitrile is reduced and the yield of hydrogen cyanide is unchanged or increased, to thereby maintain high levels of yields of acrylonitrile and hydrogen cyanide.

Process for maintaining high level of yield of acrylonitrile and

An iron-antimony-molybdenum-containing oxide catalyst composition for oxidation reactions, comprising a crystalline iron antimonate having a crystallite size of 100 .ANG. or more, said catalyst being represented by the following empirical formula:

Iron-antimony-molybdenum-containing oxide catalyst composition and

A process for producing a molybdenum bismuth-containing metal oxide catalyst comprising: mixing

Process for producing molybdenum bismuth-containing metal oxide catalyst

A process for producing a molybdenum-containing metal oxide fluid-bed catalyst comprising, as essential components,

Process for producing molybdenum-containing metal oxide fluid-bed

A process for the production of acrylonitrile by vapor phase catalytic ammoxidation of propylene in a fluidized bed at high yield with the use of a multicompenent fluidized bed catalyst comprising molybdenum, bismuth, iron, antimony, nickel and alkali metal(s) each carried by silica, which has a high catalytic activity and a high attrition resistance and which does not require any expensive cobalt catalytic component.

Process for the production of acrylonitrile

A process for producing acrylonitrile by the vapor-phase catalytic ammoxidation of propylene using a catalyst whose composition is represented by the empirical formula (I):

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Yokohama, Japan

Kunio Mori