COMPOUND OXIDE POWDER, METHOD AND APPARATUS FOR PRODUCING THE SAME AND CATALYST FOR CLEANING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide a method for producing compound oxide powder which has excellent heat resistance, restrains the grain growth of a noble metal satisfactorily when used as a catalytic carrier and keeps catalytic performance satisfactorily.

SOLUTION: The method for producing compound the oxide powder composed of two or more metal oxides comprises the steps of: precipitating a compound oxide precursor in the presence of a base from a solution containing two or more metal compounds; subjecting the compound oxide precursor to hydrothermal treatment by keeping the compound oxide precursor-precipitated solution at 80-250°C at ≥1,000 sec-1shear rate while keeping the pressure in an airtight vessel within the equilibrium steam pressure ±10%; and firing the hydrothermally-treated compound oxide precursor to obtain the compound oxide powder.

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