Heteropoly acid catalyst and method of preparing the same

Details Heteropoly acid catalyst and method of preparing the same Heteropoly acid catalyst and method of preparing the same

2007-11-29

2011-11-08

Hailey, Patricia L (Department: 1732)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Phosphorus or compound containing same

C502S208000, C502S210000, C502S211000, C502S212000, C502S303000, C502S304000, C502S305000, C502S311000, C502S312000, C502S317000, C502S318000, C502S319000, C502S320000, C502S321000, C502S322000, C502S323000, C502S324000, C502S337000

Reexamination Certificate

active

08053386

ABSTRACT:
The present invention relates to a heteropoly acid catalyst which is used for the production of methacrylic acid by gas phase oxidation of methacrolein and a preparing method thereof. The present invention, thereby, provides a novel heteropoly acid catalyst having excellent methacrolein conversion rate, methacrylic acid selectivity and yield.

REFERENCES:
patent: 2180353 (1939-11-01), Foster
patent: 4003978 (1977-01-01), Shiraishi et al.
patent: 4307247 (1981-12-01), Shaw et al.
patent: 4564607 (1986-01-01), Yoneda et al.
patent: 4596784 (1986-06-01), Kennelly et al.
patent: 5173468 (1992-12-01), Boehning et al.
patent: 5221767 (1993-06-01), Boehning et al.
patent: 5422326 (1995-06-01), Kuroda et al.
patent: 5681790 (1997-10-01), Kim et al.

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