Catalyst for the reduction of the ignition temperature of diesel soot filtered out of the exhaust gas of diesel engines

Claim 2

A catalyst for treating exhaust of Diesel engines consisting essentially of (a) a catalytically effective amount of at least one perrhenate of a metal and at least one substance selected from the group consisting of: lithium oxide copper (I)-chloride vanadium pentoxide with 1 to 30% by weight of an alkali metal oxide, and a vanadate of an alkali metal or cerium and (b) deposited on an inert, thermally stable carrier therefor, or mixed with said carrier, and applied to a structural reinforcer which is alpha-alumina or cordierite; or (c) applied to a structural reinforcer which is alpha-alumina or cordierite.

Claim 3

A catalyst for the treatment of exhaust of Diesel engines consisting essentially of a filter element as a structural reinforcer having applied thereto a catalytically effective amount of at least one perrhenate of a metal or a mixture of said perrhenate and at least one substance selected from the group consisting of: lithium oxide, copper (I)-chloride vanadium pentoxide with 1 to 30% by weight of an alkali metal oxide, and a vanadate of an alkali metal or cerium deposited on an inert, thermally stable carrier therefor, or mixed with said carrier.

Claim 4

A catalyst for the treatment of exhaust of Diesel engines consisting essentially of a filter element as a structural reinforcer having applied thereto a catalytically effective amount of at least one perrhenate of a metal or a mixture of said perrhenate and at least one substance selected from the group consisting of: lithium oxide, copper (I)-chloride vanadium pentoxide with 1 to 30% by weight of an alkali metal oxide, and a vanadate of an alkali metal or cerium deposited on an inert, thermally stable carrier therefor, or mixed with said carrier.

Claim 5

The catalyst according to claim 2, further comprising said substance being mixed with said carrier and being deposited on said filter element.

Claim 6

The catalyst according to claim 2, further comprising said carrier is deposited on said filter element and said substance is deposited on said carrier.

Claim 7

The catalyst according to claim 2, further comprising the filter element is metal, ceramic or mineral wool.

Claim 8

The catalyst according to claim 5, further comprising the filter element is a monolithic ceramic body having numerous parallel flow channels with macro-porous walls, the body having opposite end surfaces and the channels containing openings in said end surface in such a manner that a channel open in one end surface is always closed in the opposite end surface.

Claim 9

The catalyst according to claim 2, further comprising alumina as the inert, thermally stable carrier.

Claim 10

The catalyst according to claim 2, further comprising a noble metal component being deposited on at least a portion of said element.

Claim 11

The catalyst according to claim 8, further comprising wherein said noble metal is deposited on at least a portion of said inert, thermally stable carrier.

Claim 12

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines consisting essentially of a first and a second catalytically active substance, the first active substance being selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide, a vanadate of lithium, sodium, potassium or cerium or a perrhenate of a metal, admixtures thereof and the second active substance comprising noble metal, whereby both first and second catalyticallly active substances or their combinations with a carrier material are deposited on different areas of a temperature stable filter element serving as structural reinforcer, said filter element being a monolithic ceramic body having two oppositely disposed end surfaces and numerous flow channels passing through it and having macroporous walls, the openings of the channels being provided at the opposite front surfaces with closing means in such a way that a channel is open on one end surface thereof and is closed on the opposite end surface thereof, the first catalytically active substance being applied in the area of the inlet side of the filter and the second catalytically active substance being applied in the area of the outlet side of the filter, both said active substance thus covering opposite sides of the area of each macroporous flow channel wall of the monolithic ceramic body.

Claim 13

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines consisting essentially of a first and a second catalytically active substance, the first active substance being selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide, a vanadate of lithium, sodium, potassium or cerium or a perrhenate of a metal, admixtures thereof and the second active substance comprising noble metal, whereby both first and second catalyticallly active substances or their combinations with a carrier material are deposited on different areas of a temperature stable filter element serving as structural reinforcer, said filter element being a monolithic ceramic body having two oppositely disposed end surfaces and numerous flow channels passing through it and having macroporous walls, the openings of the channels being provided at the opposite front surfaces with closing means in such a way that a channel is open on one end surface thereof and is closed on the opposite end surface thereof, the first catalytically active substance being applied in the area of the inlet side of the filter and the second catalytically active substance being applied in the area of the outlet side of the filter, both said active substance thus covering opposite sides of the area of each macroporous flow channel wall of the monolithic ceramic body.

Claim 14

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines consisting essentially of a catalytically active substance consisting of an alkali metal perrhenate or silver perrhenate with one or more of lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide and a vanadate of lithium, sodium, potassium or cerium.

Claim 15

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines consisting essentially of a catalytically active substance consisting of an alkali metal perrhenate or silver perrhenate with one or more of lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide and a vanadate of lithium, sodium, potassium or cerium.

Claim 16

The catalyst according to claim 11, wherein the catalytically active substance is deposited on a temperature stable carrier substance or is mixed with it.

Claim 17

The catalyst according to claim 11, wherein the catalytically active substance or its combination with a carrier material is applied to a filter element serving as a structural reinforcer.

Claim 18

The catalyst according to claim 13, wherein a noble metal is additionally deposited on the carrier.

Claim 19

The catalyst according to claim 14, wherein the active substance is applied in the area of the inlet side of the filter and a noble metal impregnation is applied in the area of the outlet side of the filter.

Claim 20

The catalyst according to claim 15, wherein the structural reinforcer is a shaped body formed of temperature stable metal or mineral wool, or a monolithic ceramic body having two oppositely disposed end surfaces and numerous flow channels passing through it, the openings of the channels being provided at opposite front surfaces with closing means in such a way that a channel is open on one end surface thereof and is closed on the opposite end surface thereof.

Claim 21

A catalyst for treating exhaust of Diesel engines consisting essentially of a catalytically effective amount of a substance selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1 to 30% by weight of an alkali metal oxide, a vanadate of an alkali metal or cerium a perrhenate of a metal, and mixtures thereof, deposited on an inert, thermally stable carrier therefor, or mixed with said carrier, to form a composite which is deposited on a filter element serving as a structural reinforcer for said catalyst, said catalytically effective amount being the outermost layer on said catalyst, said filter element being adapted to trap soot particles from Diesel engine exhaust gases.

Claim 22

A catalyst for treating exhaust of Diesel engines consisting essentially of a catalytically effective amount of a substance selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1 to 30% by weight of an alkali metal oxide, a vanadate of an alkali metal or cerium a perrhenate of a metal, and mixtures thereof, deposited on an inert, thermally stable carrier therefor, or mixed with said carrier, to form a composite which is deposited on a filter element serving as a structural reinforcer for said catalyst, said catalytically effective amount being the outermost layer on said catalyst, said filter element being adapted to trap soot particles from Diesel engine exhaust gases.

Claim 23

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines comprising a first and a second catalytically active substance, the first active substance being selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide, a vanadate of lithium, sodium, potassium, or cerium or admixtures thereof and the second active substance comprising noble metal, whereby both first and second catalytically active substances or their combinations with a carrier material are deposited on different areas of a temperature stable filter element serving as structural reinforcer, said filter element being a monolithic ceramic body having two oppositely disposed end surfaces and numerous flow channels passing through it and having macroporous walls, the openings of the channels being provided at the opposite front surfaces with closing means in such a way that a channel is open on one end surface thereof and is closed on the opposite end surface thereof, the first catalytically active substance being applied in the area of the inlet side of the filter and the second catalytically active substance being applied in the area of the outlet side of the filter, both said active substances thus covering opposite sides of the area of each macroporous flow channel wall of the monolithic ceramic body.

Claim 24

A catalyst for the reduction of ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines comprising a first and a second catalytically active substance, the first active substance being selected from the group consisting of: lithium oxide, copper (I)-chloride, vanadium pentoxide with 1-30% by weight of an alkali metal oxide, a vanadate of lithium, sodium, potassium, or cerium or admixtures thereof and the second active substance comprising noble metal, whereby both first and second catalytically active substances or their combinations with a carrier material are deposited on different areas of a temperature stable filter element serving as structural reinforcer, said filter element being a monolithic ceramic body having two oppositely disposed end surfaces and numerous flow channels passing through it and having macroporous walls, the openings of the channels being provided at the opposite front surfaces with closing means in such a way that a channel is open on one end surface thereof and is closed on the opposite end surface thereof, the first catalytically active substance being applied in the area of the inlet side of the filter and the second catalytically active substance being applied in the area of the outlet side of the filter, both said active substances thus covering opposite sides of the area of each macroporous flow channel wall of the monolithic ceramic body.