Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2005-03-15
2005-03-15
Johnson, Christina (Department: 1725)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S208000, C502S209000, C502S211000, C502S305000, C502S311000, C502S317000, C502S344000, C502S353000, C502S345000, C502S325000, C502S319000, C502S303000, C502S304000, C502S324000, C502S355000
Reexamination Certificate
active
06867163
ABSTRACT:
A molybdenum-based precipitate is prepared according to a process including the first step of forming a crude precipitate by pH adjustment to 6.5 or less in the presence of an alkali metal compound, and the second step of dissolving the crude precipitate in aqueous ammonia and forming a precipitate by pH adjustment to 6.5 or less. Then, the resulting molybdenum-based precipitate is washed with an acid aqueous solution having a pH of 6.5 or less and containing not less than 0.01 mole/L of ammonium root. Thus, a change in average particle diameter can be suppressed and good workability can be achieved, so that a molybdenum-based precipitate having a high purity and a desired average particle diameter can be obtained.
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U.S. Appl. No. 09/926,553, filed Nov. 19, 2001, Kuroda et al.
Kawato Seiichi
Kuroda Toru
Nitta Masanori
Takezawa Hideyasu
Johnson Christina
Mitsubishi Rayon Co. Ltd.
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