Toagosei Company, Ltd.

Xinlin Tu

Mamoru Takahashi

Hiroshi Niizuma

Toshiro Hirose

Madoka Furuta

Yuuichi Sumida

Masakazu Ishii

The present invention relates to a process for producing a metal oxide catalyst which is suitable for production of acrylic acid or acrylonitrile in one stage by a catalytic oxidation reaction of propane in a high yield. The present invention is characterized by using a fine particle of metallic tellurium obtained by reducing a Te compound with a reductant as a raw material for producing an oxide catalyst including metal elements Mo&#x2014;V&#x2014;Nb&#x2014;Te. The fine particle of metallic tellurium is preferably one containing primary particles having a particle size of not more than 4.0 &#x3bc;m. By using a metal oxide obtained by the process of the present invention, acrylic acid can be produced from propane by a one-stage oxidation reaction in a higher yield not less than 40%.

Process for producing metal oxide catalyst

The invention relates to a process for producing a metal oxide catalyst capable of producing acrylic acid, acrylonitrile or the like in one stage by catalytic oxidation reaction of propane in a high yield. The invention is characterized by using one obtained by finely ground metallic Te or metallic Sb in water or an organic solvent as a raw material for the production of an oxide catalyst made of metal elements Mo&#x2014;V&#x2014;Nb&#x2014;Te or metal elements Mo&#x2014;V&#x2014;Nb&#x2014;Sb. The powder of the metallic Te or metallic Sb obtained by grinding preferably has a mode size of not more than 20 &#x3bc;m. By using the metal oxide obtained by the invention as a catalyst, it is possible to produce acrylic acid in a high yield of 35% or more from propane by a one-stage oxidation reaction.

A process for preparing a metal oxide catalyst for acrylic acid production which comprises calcining a metal compound mixture at 400&deg; C. or higher to prepare a metal oxide powder comprising Mo, V, Sb, and at least one element selected from the group consisting of Nb and Ta, and supporting a compound comprising at least one element selected from the group consisting of Sb, Tl, Se, As, Pb, Sn, Ag, Cu, Ru, and Rh on the metal oxide powder, and a process for producing acrylic acid by gas phase oxidation of propane using the catalyst.

Process for preparing metal oxide catalyst for acrylic acid production

Catalyst for the production of acrylic acid

A process for producing acrylic acid from propane and oxygen gas through a vapor-phase catalytic oxidation reaction, said process comprising conducting the reaction using as a catalyst a metal oxide containing metallic elements Mo, V, Sb, and A (provided that A is at least one element selected from the group consisting of Nb, Ta, Sn, W, Ti, Ni, Fe, Cr, and Co). The metal oxide is prepared by a process including specific steps (1) and (2). The metal oxide may be supported on a compound containing specific elements.

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Aichi, Japan

Xinlin Tu