CATALYST CARRIER FOR PURIFYING EXHAUST GAS, CATALYST FOR PURIFYING EXHAUST GAS USING THE SAME, AND MANUFACTURING METHOD OF CATALYST CARRIER FOR PURIFYING EXHAUST GAS

PROBLEM TO BE SOLVED: To provide a catalyst carrier for purifying exhaust gas capable of forming a catalyst for purifying exhaust gas exhibiting high oxygen discharge rate even when exposed to high temperature for long time.SOLUTION: There is provided a catalyst carrier for purifying exhaust gas in which a standard deviation of a percentage content of each metal element obtained by measuring a percentage content (mass%) of the metal element at 100 measurement points in a microprobe analysis range of 20 nm angle by an energy dispersion type X ray spectroscopic analysis using a scanning transmission electron microscope with a spherical surface aberration correction function on all metal elements contained in a composite metal oxide porous body containing alumina, ceria and zirconia at 0.1 mass% or more is 10 or less, a specific surface area of the porous body calculated by a BET method is 30 m/g or more, the reduction rate of the specific surface area of the porous body by burning in ambient air at 1,100°C for 5 hours is 50% or less, the reduction rate of the specific surface area of the porous body by heating at 1,100°C for 5 hours with changing reduction atmosphere and oxidation atmosphere every 5 minutes alternatively is 55% or less, and the reduction rate of the specific surface area of the porous body by heating at 1,100°C for 50 hours by changing the reduction atmosphere and the oxidation atmosphere every 5 minutes alternatively is 80% or less.SELECTED DRAWING: None 【課題】高温に長時間曝された場合であっても高い酸素放出速度を示す排ガス浄化用触媒を形成することが可能な排ガス浄化用触媒担体を提供すること。【解決手段】アルミナ、セリア及びジルコニアを含有する複合金属酸化物多孔体からなり、前記多孔体に０．１質量％以上含有されるすべての金属元素について、球面収差補正機能付き走査透過型電子顕微鏡を用いたエネルギー分散型Ｘ線分光分析により２０ｎｍ角の微小分析範囲における前記金属元素の含有率（質量％）を１００箇所の測定点で測定して得られた各金属元素の含有率の標準偏差が１０以下であり、ＢＥＴ法により求めた前記多孔体の比表面積が３０ｍ２／ｇ以上であり、大気中、１１００℃で５時間の焼成による前記多孔体の比表面積の低下率が５０％以下であり、還元雰囲気と酸化雰囲気とを５分間毎に交互に切り替えながら１１００℃で５時間加熱したことによる前記多孔体の比表面積の低下率が５５％以下であり、還元雰囲気と酸化雰囲気とを５分間毎に交互に切り替えながら１１００℃で５０時間加熱したことによる前記多孔体の比表面積の低下率が８０％以下である、ことを特徴とする排ガス浄化用触媒担体。【選択図】なし