ALUMINA CARRIER FOR EXHAUST GAS PURIFICATION CATALYST, METHOD OF PRODUCING THE ALUMINA CARRIER, AND CATALYST FOR EXHAUST GAS PURIFICATION

摘要

PROBLEM TO BE SOLVED: To reduce a spacing dimension between layers in an α-alumina carrier having a multilayer structure.

SOLUTION: An additional element-containing compound containing at least one kind of additional element selected from lanthanoids and alkaline earth elements and a gibbsite aluminum hydroxide powder are mixed to be burned at a temperature exceeding 1,000°C. The addition of the additional element increases the transformation temperature to form α-alumina, which reduces volume shrinkage degree at burning.

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