Catalyst and process for selective production of lower hydrocarbons c1-c5 from syngas with low methane and co2 production
AssigneeSaudi Basic Industries Corporation
InventorsKhalid Karim, Mohammed Al-Semahi, Asad Khan
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Abstract
A catalyst composition containing cobalt manganese oxide which is modified with silicon in the form of a hydrophilic silica, the catalyst also containing at least one of lanthanum, phosphorus, Fe, Zr, and Zn, and optionally one or more basic elements selected from the group of alkali metal, alkaline earth metal, and transition metals. Also, methods for preparing and using the catalyst composition for producing aliphatic and aromatic hydrocarbons using the catalyst composition.
Claims37
A catalyst composition comprising cobalt;
- manganese;
- hydrophilic silica;
- and at least one element selected from the group of lanthanum, phosphorus, Fe, Zr, and Zn, wherein the relative molar ratios of the elements comprised in the composition are represented by the formula
- CoMnaSibXcMdOy
- wherein:
- M is one or more elements selected from the group consisting of alkali metal, alkaline earth metal, and transition metal;
- a is about 0.8-1.2;
- b is 0.1 to 1;
- each c is from greater than 0 to about 0.005, wherein the total c is from greater than 0 to about 0.005;
- d is 0 to about 0.005;
- X is at least one element selected from the group consisting of lanthanum, phosphorus, Fe, Zr, and Zn;
- y is a number determined by the valence of the other elements present;
- and
- Sib is present as part of the catalyst composition.
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A process for producing ethylene and propylene from syngas, the process comprising the steps of
- a) contacting a syngas with a first catalyst composition to obtain a first product stream comprising ethylene, propylene, and aliphatic hydrocarbons having 4 or more carbon atoms,
- b) splitting the first product stream into a second product stream comprising at least 90% of the aliphatic hydrocarbons having 4 or more carbon atoms and a third product stream comprising ethylene and propylene,
- c) separating ethylene and propylene in the third product stream so as to form a first ethylene stream and a first propylene stream, and
- d) converting the second product stream into a fourth product stream comprising ethylene and/or propylene.
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Dependencies are inferred from the claim text.