摘要:
An ammonia slip catalyst having an SCR catalyst and an oxidation catalyst comprising at least two metals, each of which is selected from a specific group, and a substrate upon which at least oxidation catalyst is located is described. The ammonia slip catalyst can have dual layers, with one of the layers containing an SCR catalyst, a second layer containing the oxidation catalyst with comprises at least two metals, each of which is selected from a specific group, and the ammonia slip catalyst does not contain a platinum group metal. Methods of making and using the ammonia slip catalyst to reduce ammonia slip are described.
摘要:
The present invention relates to an improved process for the production of conjugated polyunsaturated fatty acids (PUFA), preferably conjugated linoleic acid (CLA), using finely dispersed heterogeneous metal catalysts on a mesoporous support, in the absence of Hg. The present invention also relates to a method to increase the large microporosity and (optionally) the small mesoporosity of a zeolite, thus obtaining a modified zeolite having a large and highly accessible internal surface.
摘要:
The present invention relates to application of catalysts for the Selective Catalytic Reduction of oxides of Nitrogen using N-containing reductant. The catalysts are characterised as phase pure lattice oxide materials into which catalytically active cations are incorporated at high levels of dispersion such that conventional analysis reveals a highly phase pure material. The materials are further characterised by high activity, hydrothermal durability and poison tolerance in the intended application.
摘要:
Es werden ein Verfahren zur Herstellung eines SCR aktiven Zeolith-Katalysators sowie ein entsprechend hergestellter Zeolith-Katalysator angegeben. Zur Herstellung wird ein Fe-lonen-getauschter Zeolith zunächst in einer reduzierenden Kohlenwasserstoff-Atmosphäre einer ersten Temperaturbehandlung (3) in einem Bereich zwischen 300°C und 600°C unterzogen, wobei sich die Oxidationsstufe der Fe-Ionen verringert und/oder die Dispersität der Fe-Ionen auf dem Zeolithen erhöht, der reduzierte Zeolith anschließend in einer oxidierenden Atmosphäre einer zweiten Temperaturbehandlung (4) zwischen 300°C und 600°C unterzogen, wobei Kohlenwasserstoffreste oder Kohlenstoffreste oxidativ entfernt werden, und der Zeolith während der ersten und der zweiten Temperaturbehandlung zu einer Katalysatormasse kalziniert (2). Durch dieses Herstellungsverfahren wird im Zeolithen enthaltenes Eisen in einer Oxidationsstufe von weniger als +3 stabilisiert und/oder eine dauerhaft erhöhte Dispersität der Fe-Ionen auf dem Zeolithen geschaffen. Hierdurch wird eine hohe SCR Aktivität in einem Temperaturbereich von unterhalb 300°C erreicht.
摘要:
In a process for producing phenol and/or cyclohexanone, benzene and hydrogen are contacted with a first catalyst in a hydroalkylation step to produce a first effluent stream comprising cyclohexylbenzene, cyclohexane, and unreacted benzene. At least part of the first effluent stream is supplied to a first separation system to divide the first effluent stream part into a cyclohexylbenzene-rich stream and a C6 product stream comprising unreacted benzene and cyclohexane.
摘要:
A filter for filtering particulate matter (PM) from exhaust gas emitted from a positive 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 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:
There is disclosed iron-containing aluminosilicate zeolites having both framework iron and iron cations on the ion-exchange sites. There is also disclosed a direct synthesis method of making an iron-containing aluminosilicate zeolite, which does not require the use of an intermediate step, such as ion-exchange or impregnation. In addition, there is disclosed a method of using the iron-containing aluminosilicate zeolite disclosed herein in a selective catalytic reduction reaction, typically in the presence of ammonia, to reduce or remove nitric oxides from exhaust emissions.