Extruded honeycomb catalyst

Process for producing a catalyst and catalyst as such

SCR method for reducing oxides of nitrogen and method for producing a catalyst for such method

A method of reducing nitrogen oxides in exhaust gas of an internal combustion engine by selective catalytic reduction (SCR) comprises contacting the exhaust gas also containing ammonia and oxygen with a catalytic converter comprising a catalyst comprising at least one crystalline small pore molecular sieve catalytically active component having a maximum ring opening of eight tetrahedral basic building blocks, which crystalline small pore molecular sieve catalytically active component comprises mesopores. A method for producing an extruded shaped body comprising the catalyst is also disclosed. The method comprises preparing an extruded book composition comprising at least one crystalline small pore molecular sieve catalytically active component and having a maximum ring opening of eight tetrahedral basic building blocks, extruding the extruded will composition into a shaped body and introducing mesopores into the at least one crystalline small pore molecular sieve in the shaped body by alkaline ...

Nox absorber catalysts

Extruded honeycomb catalyst

An extruded honeycomb catalyst for nitrogen oxide reduction according to the selective catalytic reduction (SCR) method in exhaust gases from motor vehicles comprises an extruded active carrier in honeycomb form comprising a first SCR catalytically active component and with a plurality of channels through which the exhaust gas flows during operation, and a washcoat coating comprising a second SCR catalytically active component being applied to the extruded body, wherein the first SCR catalytically active component and the second SCR catalytically active component are each independently selected from the group consisting of: (i) vanadium catalyst with vanadium as catalytically active component; (ii) mixed-oxide catalyst with one or more oxides, in particular those of transition metals or lanthanides as catalytically active component; and (iii) an Fe- or a Cu-zeolite catalyst. Also shown is a method of producing the honeycomb catalysts and an exhaust system for a lean burn internal combustion ...

NOx absorber catalysts

A NOx absorber catalyst comprises an extruded solid body consisting of: (A) 10-95% by weight of at least one binder/matrix component wherein the binder/matrix component is cordierite, and nitride, a carbide, a boride, and intermetallic, lithium aluminosilicate, and alumina, a doped alumina, silica, silica sol, quartz, fused silica, amorphous silica, sodium silicate, amorphous aluminosilicate, an alkoxysilane, a silicone resin binder, a clay, talc, titanium, zirconia, titanium-zirconia, zircon or a mixture of any two or more thereof; and (B) 5-80% by weight ceria or stabilised ceria, the catalyst comprising at least one precious metal selected from the group consisting of gold, silver, platinum, palladium, and rhodium and at least one alkaline metal, which is potassium and/or caesium, or at least one alkaline earth metal, which is barium or strontium wherein: a majority of the at least one alkaline metal or the at least one alkaline earth metal is located at a surface of the extruded solid ...

NOx absorber catalysts

Process for producing a catalyst and catalyst as such

A process for producing an extruded catalyst comprises extruding a catalyst composition 4 to produce a catalyst body 6, where, to set desired rheological properties of the catalyst composition, the catalyst composition comprises an inorganic binder fraction B which is catalytically inactive in a starting state and is composed of at least one inorganic binder component consisting of individual particles and at least part of the inorganic binder fraction has been treated to develop catalytic activity. A catalytically active component Z may be mixed in addition to the binder fraction into the catalyst composition. The catalytically active component may be selected from a zeolite and a molecular sieve. The particles of the at least one inorganic binder component may not have a zeolitic framework structure in the catalytically inactive starting state. The at least one inorganic binder component may be coated with a catalytically active layer, which may be a zeolite layer. A catalyst having an ...

Extruded honeycomb catalyst

Extruded scr filter

Filter comprising combined soot oxidation and nh3-scr catalyst

Catalyst and method for preparing a catalyst

A catalyst (2, Fig. 1) with a porous, ceramic support body 4 has a porosity which is formed by pores in the ceramic support body, and which has a catalytically active washcoat coating 10 applied to the ceramic support body. The catalytically active washcoat coating has a layer thickness (d1). The support body has a permanent catalytically inactive impregnation 12 which comprises at least one catalytically inactive inorganic component, wherein the inactive impregnation: (a) has a layer thickness (d2) and is present at least partially between a surface of the porous ceramic support body and the catalytically active washcoat coating; and/or (b) is present in the pores of the ceramic support body in a region with reduced porosity underneath the surface of the ceramic support body. Suitably, the catalytically inactive inorganic component is a sol, particularly a titanium sol or silicon sol, water glass, a silane, particularly an alkylsilane, a siloxane, a phosphate, particularly an aluminium ...

Extruded honeycomb catalyst

An extruded honeycomb catalyst for nitrogen oxide reduction according to the selective catalytic reduction (SCR) method in exhaust gases from motor vehicles comprises an extruded active carrier in honeycomb form comprising a first SCR catalytically active component and with a plurality of channels through which the exhaust gas flows during operation, and a washcoat coating comprising a second SCR catalytically active component being applied to the extruded body, wherein the first SCR catalytically active component and the second SCR catalytically active component are each independently selected from the group consisting of: (i) vanadium catalyst with vanadium as catalytically active component; (ii) mixed-oxide catalyst with one or more oxides, in particular those of transition metals or lanthanides as catalytically active component; and (iii) an Fe- or a Cu-zeolite catalyst. Also shown is a method of producing the honeycomb catalysts and an exhaust system for a lean burn internal combustion ...

Extruded honeycomb catalyst

An extruded honeycomb catalyst for nitrogen oxide reduction according to the selective catalytic reduction (SCR) method in exhaust gases from motor vehicles comprises an extruded active carrier in honeycomb form comprising a first SCR catalytically active component and with a plurality of channels through which the exhaust gas flows during operation, and a washcoat coating comprising a second SCR catalytically active component being applied to the extruded body, wherein the first SCR catalytically active component and the second SCR catalytically active component are each independently selected from the group consisting of: (i) vanadium catalyst with vanadium as catalytically active component; (ii) mixed-oxide catalyst with one or more oxides, in particular those of transition metals or lanthanides as catalytically active component; and (iii) an Fe- or a Cu-zeolite catalyst. Also shown is a method of producing the honeycomb catalysts and an exhaust system for a lean burn internal combustion ...

Extruded honeycomb catalyst