| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for recovering MoO3 in a high yield at a low temperature from a used catalyst containing Mo. SOLUTION: In a method for recovering molybdenum from a used catalyst, (1) steam or steam-containing gas is contacted with a used catalyst which contains molybdenum and titanium oxide as main components at 500-700 deg.C, molybdenum oxide in the catalyst is converted into molybdic acid vapor, the vapor is cooled at 500 deg.C or below to recover molybdenum oxide or molybdic acid. In this process, the catalyst is added with a sintering accelerator in advance, and (2) the accelerator is an oxide containing at least one element selected from vanadium, cobalt, nickel, and copper or the salt of a compound containing the element.
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