A low temperature water gas shift catalyst containing copper, zinc, aluminum in which the aluminum component is prepared from highly dispersible alumina is disclosed,

Low temperature water gas shift catalyst

The invention relates to a process for preparing Cu/Zn/Al catalysts. In this process, the metals are used in the form of their formates and are precipitated in a suitable form. Suitable precipitants are, for example, alkali metal carbonates. The invention further relates to a catalyst as can be obtained by the process according to the invention and to its use.

Production of cu/zn/al catalysts via the formate route

The present invention relates to a catalyst precursor material comprising oxides and carbonates of copper, zinc and aluminium, wherein Cu and En are present together in a greater molar amount than aluminum and said carbonates and oxides form a homogeneous phase, as well as the catalyst material resulting from the reduction of this precursor. The catalyst material comprises discrete crystalline Cu particles partly embedded in a continuous homogeneous phase comprising oxides and carbonates of at least Zn and Al wherein in said catalyst material Cu and Zn are present together in a greater molar amount than aluminum and preferably the molar ratio of Cu and Zn is 0,5/1 to less than 2.8/1 and the Al content is 1 to 30 ¾ by mol, based on all metal constituents. The invention also pertains to a specific method of making this catalyst. The catalyst shows an excellent performance and stability in the synthesis of methanol from synthesis gas.

Methanol synthesis catalyst on the basis of copper, zinc and aluminum

Catalysts and methods for their manufacture and use for the synthesis of dimethyl ether from syngas are disclosed. The catalysts comprise ZnO, CuO, ZrO2, alumina and one or more of boron oxide, tantalum oxide, phosphorus oxide and niobium oxide. The catalysts may also comprise ceria. The catalysts described herein are able to synthesize dimethyl ether directly from synthesis gas, including synthesis gas that is rich in carbon monoxide.

Catalyst And Method For The Direct Synthesis Of Dimethyl Ether From Synthesis Gas

The invention relates to a method for cleaning hydrocarbon mixtures, in which a contaminated hydrocarbon mixture comprising hydrocarbons having three to eight carbon atoms is at least partly freed of impurities by contacting with a solid sorbent, wherein the hydrocarbon mixture is exclusively in the liquid state during contact with the sorbent. The object of the invention is to specify a process for cleaning liquid C 3 to C 8 hydrocarbon mixtures, which is based on a readily available but non-carcinogenic sorbent and which achieves better purities compared to traditional molecular sieves. This object is achieved by using, as sorbents, solid materials of the following composition:
 copper oxide: 10% to 60% by weight (calculated as CuO); zinc oxide: 10% to 60% by weight (calculated as ZnO); aluminum oxide: 10% to 30% by weight (calculated as Al 2 O 3 ); other substances: 0% to 5% by weight. Materials of this kind are otherwise used as catalysts in methanol synthesis.

Cleaning of liquid hydrocarbon streams by means of copper-containing sorbents

Disclosed is an Cu/Zn/Al-catalyst containing copper oxide and zinc oxide as catalytically active components and aluminium oxide as thermostabilising component. The catalyst is characterized in that the Cu/Zn atomic ratio is <2.8 and the aluminium oxide component is obtained from an aluminium hydroxide sol.

Cu/Zn/Al catalyst for methanol synthesis

Copper/zinc/aluminium catalysts (I) with Cu and Zn oxides as catalytic components and Al oxide as thermal stabilizer, in which the Cu/Zn atom ratio is less than 2.8 and the Al oxide component is at least partly in the form of an Al hydroxide sol. An Independent claim is also included for a method for the production of (I) by precipitation of hydroxide-carbonates or hydroxides from a solution of Cu and Zn salts with an alkali carbonate or aluminate solution (either of which contains an Al hydroxide sol), followed by separation, washing, drying, calcination and optionally reduction of the precipitate.

Copper-zinc-aluminium catalyst for use in methanol synthesis has a relatively low copper to zinc atom ratio and contains the aluminum oxide component in the form of an aluminum hydroxide sol

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Papers

Cu/Zn/Al catalyst for methanol synthesis

Copper-zinc-aluminium catalyst for use in methanol synthesis has a relatively low copper to zinc atom ratio and contains the aluminum oxide component in the form of an aluminum hydroxide sol