Abstract:
Selective hydrogenation process comprising: • contacting in the presence of hydrogen an hydrocarbon feedstock comprising at least one unsaturated compound selected from the group consisting of alkynes and dienes and mixtures thereof with a first hydrogenation catalyst in a first reaction zone to produce a first product stream having a reduced proportion of alkynes and/or dienes ; and • contacting the first product stream in a second reaction zone having an inlet and an outlet, in the presence of optional additional hydrogen, with a second hydrogenation catalyst to produce a second product stream,
wherein, the first hydrogenation catalyst comprises : • a first constituent of at least one metal or metal-based component selected from the elements consisting of Groups 1-10 of the Periodic Table of Elements (new IUPAC notation) and optionally a second constituent of at least one metal or metal-based component selected from the elements consisting of Groups 11-14 of the Periodic Table of Elements, and
said first constituent and optional second constituent are on a carrier made essentially of SiC or of a crystalline silicate. Hydrogenation catalyst comprising: • a first constituent of at least one metal or metal-based component selected from the elements consisting of Groups 1-10 of the Periodic Table of Elements (new IUPAC notation) and a second constituent of at least one metal or metal-based component selected from the elements consisting of Groups 11-14 of the Periodic Table of Elements, and • said first constituent and second constituent are on a carrier made essentially of a crystalline silicate or of SiC, • the second constituent is optional if the carrier is made essentially of SiC.
Abstract:
The invention relates to moulded bodies having catalytic properties, obtained due to a method that comprises the following said steps: a) a moulded body is produced by means of a powder-based rapid- prototyping-method, b) said moulded body is optionally heat-treated, c) at least one catalytically active component is optionally applied to the moulded body, d) said moulded body is optionally subjected to another heat-treatment. The steps b, c) and/or d) can be performed several times. Said moulded bodies are used as reactor fittings in heterogeneously catalyzed chemical reactions.
Abstract:
A catalyst has high activity and is suitable for use in producing chlorine by oxidizing hydrogen chloride with oxygen. The catalyst includes copper, an alkali metal and a rare earth and has pores of which pores having a diameter of 5 to 15 nm have a pore volume of 0.4 to 2.0 ml/g.
Abstract:
A process utilising the gases carbon monoxide, carbon dioxide and hydrogen to produce alcohols directly, comprises the steps of bringing a fluid mixture comprising carbon monoxide, carbon dioxide and hydrogen into contact with the surfaces of a supported tubular porous catalyst membrane having a range of pore sizes including micropores, mesopores and macropores, controlling the temperature of the said catalyst membrane, maintaining a pressure over said catalyst membrane of from 88 to 600 kPa, and recovering alcohol containing product formed by contact of the fluid mixture with said catalyst membrane.
Abstract:
The drive of direct-heat-supply type reforming of hydrocarbon at ordinary temperature is necessary in order to realize a self-sustaining, on-site reforming type fuel cell system which does not necessitate the supply of energy from the outside. According to the invention, an oxide, CeO 2 or Pr 6 O 11 , or a Ce/Zr or Ce/Zr/Y double oxide is used as the oxide containing a rare earth element capable of changing the oxidation number with an active metal and oxygen defects are introduced into the oxide or double oxide by activating the oxide or double oxide with a reducing gas at high temperature. When a reaction gas containing hydrocarbon and oxygen is passed though the catalyst at low temperature, the oxygen defects react with oxygen and thereby return to the original oxide. Since this return reaction is an exothermic reaction, the catalyst itself is heated, which acts as the driving force for advancing the combustion of the hydrocarbon, whereby the catalyst layer is further heated and the reforming is advanced to from hydrogen. Thus, the hydrogen-producing reaction can be driven even at low temperature, particularly ordinary temperature.
Abstract:
The invention relates to a method for preparing an adsorbent, comprising the following successive steps: cogranulation-based forming of a faujasite-type zeolite powder A together with an alumina powder B, the powder mixture containing between 10 and 70 wt.-% powder A; steam treatment; and drying. The invention also relates to a method for adsorption of organic contaminants containing at least one heteroatom and present in an olefin feed containing at least 50 vol.-% hydrocarbons, said method including a step in which the olefin feed is brought into contact with the adsorbent obtained using the above preparation method.
Abstract:
A method of converting nitrogen oxides in a gas stream to nitrogen comprises contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a non-zeolite base metal catalyst consisting of: (a) at least one transition metal dispersed on a mixed oxide or composite oxide or a mixture thereof as support material consisting of cerium and zirconium; or (b) cerium oxide and zirconium oxide as single oxides or a composite oxide thereof or a mixture of the single oxides and the composite oxide dispersed on an inert oxide support material, whereon is dispersed at least one transition metal.
Abstract:
A catalyst for the epoxidation of an olefin comprising a carrier and, deposited on the carrier, silver, a rhenium promoter, a first co-promoter, and a second co-promoter; wherein the molar ratio of the first co-promoter to the second co-promoter is greater than 1; the first co-promoter is selected from sulfur, phosphorus, boron, and mixtures thereof; and the second co-promoter is selected from tungsten, molybdenum, chromium, and mixtures thereof; a process for preparing the catalyst; a process for preparing an olefin oxide by reacting a feed comprising an olefin and oxygen in the presence of the catalyst; and a process for preparing a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, or an alkanolamine.