Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2008-05-27
2008-05-27
Zucker, Paul A (Department: 1621)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C562S535000
Reexamination Certificate
active
11078680
ABSTRACT:
A catalyst for production of acrylic acid which catalyst is so high in activity as to give a still higher selectivity of acrylic acid or a long-catalytic-life-time catalyst for production of acrylic acid which catalyst is so high in activity as to be able to give a high acrylic acid yield while suppressing the temperature rise of the oxidation reaction to a low one; and processes for production of acrylic acid using these catalysts. The catalyst includes an oxide and/or a composite oxide as an essential catalytic component, wherein the oxide and/or the composite oxide has a metal element composition shown by general formula (1):in-line-formulae description="In-line Formulae" end="lead"?MoaVbWcCudOx (1)in-line-formulae description="In-line Formulae" end="tail"?(wherein: when a=12, then 1≦b≦14, 0≦c≦12, 0 ≦d≦10, and 0<c+d; and x is a numerical value determined by oxidation states of the elements);with any of the vanadium, tungsten, and copper being maldistributed in the surface side or core side of the catalyst.
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Tanimoto Michio
Yunoki Hiromi
Nippon Shokubai Co. , Ltd.
Zucker Paul A
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