US4062807A — Nitrogen oxide reducing catalyst

Claim 1

Independent Claim 109 words

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.

Claim 2

Dependent Claim 109 words

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.

Claim 3

Dependent Claim 22 words

The nitrogen oxide reducing catalyst of claim 1, wherein said carbide particles have an average particle size of 1 to 10 μ.

Claim 4

Dependent Claim 27 words

The nitrogen oxide reducing catalyst according to claim 1 in which said skeleton structure consists of an element with an average diameter of 10 to 5000 μ.

Claim 5

Dependent Claim 20 words

The nitrogen oxide reducing catalyst according to claim 3 in which said element of said skeleton structure is a wire.

Claim 6

Dependent Claim 20 words

The nitrogen oxide reducing catalyst according to claim 3 in which said element of said skeleton structure is cutting chips.

Claim 7

Dependent Claim 22 words

The nitrogen oxide reducing catalyst according to claim 1 in which a relative density of said skeleton structure is 5 to 50%.

Claim 8

Independent Claim 95 words

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.

Claim 9

Independent Claim 95 words

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.

Claim 10

Dependent Claim 30 words

The method according to claim 7, in which said powder compact comprises 10 to 40 weight percent of powdered bonding agent and 60 to 90 weight percent of powdered carbide.

Claim 11

Dependent Claim 20 words

The method according to claim 7 in which said sintering was effected at a temperature of more than 1250° C.

Claim 12

Dependent Claim 90 words

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.

Claim 13

Dependent Claim 90 words

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.

Claim 14

Dependent Claim 31 words

The nitrogen oxide reducing catalyst of claim 10 wherein said powder compact comprises 10 to 40 weight percent of powdered bonding agent and 60 to 90 weight percent of powdered carbide.

Claim 15

Dependent Claim 21 words

The nitrogen oxide reducing catalyst of claim 10 wherein said sintering is effected at a temperature in excess of 1250° C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-12-12	1981-06-13	1981-12-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-12-12	1985-06-13	1985-12-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-12-12	1989-06-13	1989-12-13	$7700.00	Window Closed / Lapsed

Nitrogen oxide reducing catalyst

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag