| 简介 |
PROBLEM TO BE SOLVED : To provide a catalyst carrier which is made by forming a catalyst carrying layer containing an alkaline earth metal and/or an alkali metal on the surface of an alumina substrate, and prevents or inhibits the alkaline earth metal and/or the alkali metal from moving into the substrate to react with alumina in the substrate.
SOLUTION : In the catalyst carrier made by forming the catalyst carrying layer 3 containing the alkaline earth metal and/or the alkali metal on the surface of the alumina substrate 1 having a three-dimensional network structure, a zirconia layer 2 made of zirconia and/or stabilized zirconia is formed between the substrate 1 and the catalyst carrying layer 3. The average thickness of the zirconia layer 2 is 2-30 μm, or the amount of the carried zirconia layer is 2-30 wt.% to the total catalyst carrier, and the particle size of the raw materials composing the zirconia layer is 5 μm or less. The zirconia layer prevents or inhibits the alkaline earth metal and/or the alkali metal in the catalyst carrying layer from moving into the substrate.
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