摘要:
A new crystalline molecular sieve designated SSZ-98 is disclosed. SSZ-98 has the ERI framework type and is synthesized using a N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent.
摘要:
A catalysed honeycomb wall-flow filter for treating exhaust gas comprising particulate matter emitted from an internal combustion engine, which filter comprising a honeycomb substrate having a first end and a second end and comprising an array of interconnecting porous walls defining an array of longitudinally extending first channels and second channels, wherein the first channels are bordered on their sides by the second channels and have a larger hydraulic diameter than the second channels, wherein the first channels are end-plugged at a first end of the honeycomb substrate and the second channels are end-plugged at a second end of the honeycomb substrate, wherein channel wall surfaces of the first channels comprise an on-wall-type catalytic washcoat. The invention also relates to an exhaust system comprising the catalysed filter and to methods of making it.
摘要:
A copper containing ZSM-34, OFF and /or ERI zeolitic material is provided, which has a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10wt.%, based on the total weight of the calcined zeolitic material, and an alkali metal content, reported as the metal oxide, of less than about 0.7wt.%.
摘要:
Catalyst comprising a molecular sieve with the ERI framework type having a mole ratio of silica to alumina from about 8 to about 100 and a crystal morphology defined by the ratio between the dimensions r c along and r a orthogonal to the unique c-axis between 0.5 and 2.0 and use of the catalyst in catalytic reactions.
摘要:
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 (2) comprising at least one crystalline small-pore molecular sieve catalytically active component (Z M,I )having a maximum ring opening of eight tetrahedral basic building blocks, which crystalline small-pore molecular sieve catalytically active component (Z M,I ) comprising mesopores.
摘要:
A cold start catalyst is disclosed. The cold start catalyst comprises a zeolite catalyst and a supported platinum group metal catalyst. The zeolite catalyst comprises a base metal, a noble metal, and a zeolite. The supported platinum group metal catalyst comprises one or more platinum group metals and one or more inorganic oxide carriers. The invention also includes an exhaust system comprising the cold start catalyst. The cold start catalyst and the process result in improved NO x storage and NO x conversion, improved hydrocarbon storage and conversion, and improved CO oxidation through the cold start period.
摘要:
The present invention relates to a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as Cu O, ranging from about 1 to about 10 wt.-%, based on the total weight of the cal- cined zeolitic material, and having an alkali metal content, reported as the metal oxide, ranging from about 0.7 to about 1.5 wt.-%, whereas the 750°C-aged copper containing ZSM-34, OFF and/or ERI zeolitic materialexhibits NO conversion at 200°C of at least about 75 % and at 450°C of at least about 90 %, measured at a gas hourly volume based space velocity of 30000 h - under steady state conditions at maximum NH 3 -slip conditions in a gas mixture of 500 ppm NO, 500 ppm NH 3, 10% O 2, 5% H 2 O, balance N
摘要:
A filter for filtering particulate matter (PM) from exhaust gas emitted from a compression ignition engine, which filter comprising a porous substrate having inlet surfaces and outlet surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a porous structure containing pores of a first mean pore size, wherein the porous substrate is coated with a wash coat comprising a plurality of solid particles comprising a molecular sieve promoted with at least one metal wherein the porous structure of the wash coated porous substrate contains pores of a second mean pore size, and wherein the second mean pore size is less than the first mean pore size.
摘要:
The invention relates to a metal doped or metal exchanged zeolite, wherein the doping metal is present in the zeolite in the isolated form of individual atoms i.e. as a monomeric and/or dimeric species. The invention further relates to a method for production of such a metal exchanged zeolite. Said metal doped zeolites are useful, in particular, for the reduction of nitrogen oxides.
摘要:
Uses for a new crystalline molecular sieve designated SSZ-98 are disclosed. SSZ-98 has the ERI framework type and is synthesized using a N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent.