HALOGEN-CONTAINING CATALYST AND PROCESS FOR THE PREPARATION THEREOF

摘要

A halogen-containing catalyst wherein halogen is uniformly distributed, particularly one exhibiting an .alpha. ratio of 0.17 or below in the figure obtained in the line analysis of the section of the catalyst for halogen atoms in one direction with an electron probe microanalyzer (EPMA) which shows a curve of intensity (I) of X-rays vs. distance (x) in the sectional widthwise direction (from one surface of the catalyst), with the .alpha. ratio being defined by the formula: (F-F0)/F (wherein F is an intensity value of X-rays obtained by integrating the above curve I(x) between one of the surfaces of the catalyst and the other thereof anf F0 is one obtained by integrating the tangent line I0(x) of the above curve at the minimum and lowest point thereof between them; and a process for the preparation of a halogen-containing catalyst, characterized by making a carrier such as L-zeolite support a halogen thereon and drying the resulting carrier at an evaporation rate of moisture of 15 wt.%/h or below. The catalyst has a uninform halogen distribution and is therefore lowered in the decomposing activity, thus being suitable for the preparation of aromatic hydrocarbons.