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US 4,062,807 AGranted
Nitrogen oxide reducing catalyst
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorKazuo Suzuki
Life of this patent
Estimating the term…
Abstract
A nitrogen oxide reducing catalyst comprises a carrier made of at least one kind of metal selected from the group consisting of Ni, Co, Fe and an alloy made principally of two or more of these metals, and a carbide of at least one transition metal selected from the group consisting of Cr, Ti, Zr and V and carried by the carrier.
Claims12
A nitrogen oxide reducing catalyst produced by the process which comprises:
- a. immersing a metal skeleton structure in a suspension prepared by suspending in a dispersion medium carbide particles of at least one transition metal selected from the group consisting of Cr, Ti, Zr, and V to attach said carbide particles to the surface of said skeleton, wherein said skeleton comprises at least one metal selected from the group consisting of Ni, Co, Fe and an alloy mainly comprised of at least two of these metals, and
- b. sintering the combination of said skeleton and said attached carbide particles so as to sinter said carbide particles onto said skeleton.
A method for manufacturing a nitrogen oxide reducing catalyst comprising the steps of
- a. sintering a powder compact comprising at least one kind of powdered bonding agent selected from the group consisting of Ni, Co, Fe and an allow mainly made of at least two of these metals, and a carbide of at least one transition metal selected from the group consisting of Cr, Ti, Zr and V, to obtain a sintered body;
- b. subjecting said sintered mass to an acid solution to partially remove said bonding agent from the surface of said sintered body.
A nitrogen oxide reducing catalyst manufactured by the process which comprises.
- a. sintering a powder compact comprising at least one powdered bonding agent selected from the group consisting of Ni, Co, Fe and an alloy mainly comprising at least two of these metals, and a carbide of at least one transition metal selected from the group consisting of Cr, Ti, Zr, and V, to obtain a sintered body;
- and
- b. subjecting said sintered mass to an acid solution to partially remove said bonding agent from the surface of said body.
Dependencies are inferred from the claim text.