Dried granules for catalyst production, catalyst, and compound production method

Abstract

A catalyst, wherein when a scanning electron microscope (SEM) with an accelerating voltage of 15 kV is used to obtain an SEM image of the catalyst at a magnification such that the maximum length of one particle in the vertical direction in the SEM image occupies 90% or more of the vertical length of the SEM image and the maximum length of one particle in the horizontal direction in the SEM image occupies 90% or more of the horizontal length of the SEM image, the concentration of bismuth (Bi) in white areas when the SEM image is binarized into black and white is larger than the value obtained by adding 2.5 times the value of the standard deviation [sigma]1 of the Bi concentration in the black areas to the Bi concentration in the black areas.

Description

technical field [0001] The present invention relates to a novel catalyst capable of obtaining a target product with high activity and a high yield, and particularly relates to a catalyst capable of being stable even in a region where the catalyst activity is high when producing an unsaturated aldehyde, an unsaturated carboxylic acid, or a conjugated diene by oxidation. A catalyst and a method for producing the same can be produced with a high yield. Background technique [0002] Methods for producing corresponding unsaturated aldehydes and unsaturated carboxylic acids using propylene, isobutene, t-butanol, etc. as raw materials, and gas-phase catalytic oxidation methods for producing 1,3-butadiene from butenes are widely practiced industrially. In particular, many reports have been made on methods of producing corresponding unsaturated aldehydes and unsaturated carboxylic acids using propylene, isobutylene, tert-butanol, etc. as raw materials as means to increase their yield...

AI Technical Summary

Problems solved by technology

As mentioned above, no research has been seen in the prior art to improve the total yield of unsaturated aldehydes and / or unsaturated carboxylic acids in the process of producing the corresponding unsaturated aldehydes and / or unsaturated carboxylic acids from olefins (hereinafter, described as "effective yield") itself, and even in the reaction under the condition of a high load, the reaction bath temperature is suppressed low and the effective yield that has been improved is stably produced

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