摘要:
An exhaust gas treatment unit for the selective catalytic reduction of nitrogen oxides under lean exhaust gas conditions which contains at least one catalyst with catalytically active components for selective catalytic reduction (SCR components). The exhaust gas treatment unit is characterised in that the catalyst also contains, in addition to SCR components, at least one storage component for nitrogen oxides (NOx components).
摘要:
Procedure for the preparation of a solid carrier for olefin polymerization catalysts comprising the steps: a) impregnating a silica with a solution of Mg-chloride in the presence of electron donors, b) drying the impregnated silica obtained in (a) and impregnating it with a solution of Mg-alkyls in SiCl4 at a temperature from null10 to 20null C., optionally adding a further. amount of electron donors, c) subsequently treating the slurry obtained in (b) at a temperature from 40null C. to reflux temperature, d) drying the carrier obtained in (c). The carrier which is obtained according to the above procedure is advantageously used for the preparation of supported catalysts for the polymerization of olefins
摘要:
The present invention relates to a chromium/silca-aluminophosphate catalyst, titanated under specific conditions and used for the homopolymerisation or the copolymerisation of ethylene. The polyethylene obtained with this catalyst has a high melt potential and a high shear resistance. The catalyst has a high level of activity.
摘要:
A method for cleaning diesel engine exhaust gas is described. The exhaust gas is passed over a catalytic converter with an active material which contains (% by weight) 70-95% TiO2, 2-10% WO3 and/or MoO3, 0.1-5% V2O5, 0.1-8% CaO, 0.1-8% Al2O3, 0.1-5% B2O3 and 0.1-10% SiO2. A reducing agent for a reduction of nitrogen oxides is metered into the exhaust-gas stream upstream of the catalytic converter.
摘要翻译:描述了一种用于清洁柴油发动机废气的方法。 废气通过含有(重量%)(重量%)70-95%TiO 2,2-10%WO 3和/或MoO 3,0.1-5%V 2 O 5,0.1-8%CaO,0.1- 8%Al2O3,0.1-5%B2O3和0.1-10%SiO2。 将用于还原氮氧化物的还原剂计量到催化转化器上游的排气流中。
摘要:
A reforming catalyst comprising precious metal particles dispersed on a support material, wherein the precious metal particles comprise rhodium or ruthenium, characterised in that the support material comprises silica, alumina and ceria is disclosed. The catalyst shows improved sulphur tolerance. Catalysed components and fuel processing systems comprising the catalysts, and reforming processes using the catalysts are also disclosed.
摘要:
A crystalline titanosilicate catalyst which is usable as a catalyst in the oxidation reaction of a compound having a carbon-carbon double bond and at least one other functional group, a process for producing the catalyst, and a process for producing an oxidized compound by an oxidation reaction using the catalyst. It has been found that a crystalline titanosilicate having a structural code of MWW effectively functions as a catalyst in an oxidation reaction of a compound having a carbon-carbon double bond and at least one other functional group wherein the carbon-carbon double bond of the compound is oxidized by using a peroxide as an oxidizing agent, thereby to highly selectively provide an intended oxidized compound.
摘要:
A catalyst support consisting mainly of synthetic silica, with 0.5-10 parts by weight of one or more oxides or phosphates of the elements of group IIA, IIIB, IVB, VB, VIIB, VIIB, VIII, IB, IIB, IIIA, IVA and the lanthanides characterised in that the support preparation method comprises mixing particulate synthetic silica with particulate oxides or phospates of the elements of Groups IIA, IIIB, IVB, VB, VIIB, VIIB, VIII, IB, IIB, IIIA, IVA and the lanthanides, or with precursors thereof, a forming step and calcination. The catalyst support is used together with phosphoric acid in the production of alcohols from olefins by hydration.
摘要:
A process for desulfurization and, if necessary, for denitrification of hydrocarbon fractions is characterized in that: said hydrocarbon mixture is brought into contact with a non-aqueous ionic liquid of general formula QnullAnull that contains at least one alkylating agent, making it possible to form ionic sulfur-containing derivatives (and, if necessary, nitrogen-containing derivatives) that have a preferred solubility in the ionic liquid; and said ionic liquid is separated from the hydrocarbon mixture that is low in sulfur and nitrogen by decanting.
摘要:
The production of ethylenically unsaturated acids or esters by the catalytic reaction of an alkanoic acid or ester, especially methyl propionate, with formaldehyde, and a catalyst therefor wherein the catalyst comprises a porous high surface area silica containing 1-10% by weight of an alkali metal, especially cesium (expressed as a metal) and having compounds of at least one modifier element selected from boron, magnesium, aluminium, zirconium and hafnium dispersed in the pores of said silica in such amount that the catalyst contains a total of 0.25 to 2 gram atoms of primary modifier element per 100 moles of silica.
摘要:
A ceramic material made from a precursor mixture including bottom ash particles recovered from a municipal solid waste combustor and fly ash particles recovered from combustion residual gases of a municipal solid waste combustor. In a process for manufacturing a technical ceramic from combined MWC ash, bottom ash particles are recovered from a municipal solid waste combustor and fly ash particles are recovered from combustion residual gases of a municipal solid waste combustor. The bottom ash particles are mixed with the fly ash particles to form a precursor combined ash mixture, which is cast to form the ceramic material.