Patent ID: 9409152
Filing Date: 2016-08-09
CPC Classification: B01D,B01J,Y02T

Claim Text:
1. A catalyst support for purification of exhaust gas comprising a porous composite metal oxide, the porous composite metal oxide containing alumina, ceria, and zirconia and having an alumina content ratio of from 5 to 80% by mass, wherein the porous composite metal oxide is produced by: introducing independently a first raw material solution and a second raw material solution directly into a region in which a shear rate is from 1000 to 200000 sec adjusting a pH of the colloidal solution to between 3 and 5, degreasing the colloidal solution after the pH adjustment or a suspension of metal compounds which is obtained by adding an organic amine to the colloidal solution after the pH adjustment, and then subjecting the solution or the suspension to heat treatment at from 700 to 1050° C. in an oxidizing atmosphere, to obtain the porous composite metal oxide, and wherein after calcination in air at 1100° C. for 5 hours, the porous composite metal oxide satisfies a condition such that standard deviations of content ratios (as at % unit) of aluminum, cerium and zirconium elements are each 19 or less with respect to 100 minute areas (with one minute area being 300 nm in length×330 nm in width) of the porous composite metal oxide, the standard deviation being determined by energy dispersive X-ray spectroscopy using a scanning transmission electron microscope equipped with a spherical aberration corrector.