Patent ID: 6518470
Filing Date: 2003-02-11
Classification: B01J

Abstract:
A halogen-containing catalyst which contains one or more halogen components and in which the halogen amount distribution in the catalyst is uniform wherein, in a drawing showing a relation between a sectional width direction distance (x: a distance from one catalyst surface) and an X-ray intensity (I) obtained by subjecting a halogen atom on a catalyst section to a linear analysis measurement in one direction by the use of an electron probe microanalysis (an EPMA) device, a ratio &agr; [{(Fâˆ’F0)/F} of a value (Fâˆ’F0) to an integrated value (F)] is 0.17 or less, and the value (Fâˆ’F0) is calculated by subtracting a value (F0) obtained by integrating an X-ray intensity (I0) of a tangent of a curve at the minimum and smallest value of the curve indicating the X-ray intensity with respect to x between one catalyst surface and the other catalyst surface, from the value (F) obtained by integrating the above-mentioned I with respect to x between the surfaces.