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|1. (WO2018181226) CATALYST AND CATALYST GROUP|
|Applicants:||MITSUBISHI CHEMICAL CORPORATION
|Title:||CATALYST AND CATALYST GROUP|
The objective of the present invention is to provide a catalyst with which pressure losses and coking are suppressed and with which it is possible to produce a target substance with a high yield, when the catalyst is used to produce the target substance by causing a material to undergo a gas phase catalytic oxidation reaction. The present invention relates to a ring-shaped catalyst which is used when producing a target substance by causing a material to undergo a gas phase catalytic oxidation reaction and which has a straight body portion and a hollow body portion, wherein the length of the straight body portion is less than the length of the hollow body portion, and the catalyst has a concave curve from an end portion of the straight body portion to an end portion of the hollow body portion in at least one end portion of the catalyst.