Cobalt-nickel-molybdenum-potassium (Co-Ni-Mo-K) catalyst for preparing low carbon alcohol by synthetic gas and preparation method thereof

Abstract

The invention provides a cobalt-nickel-molybdenum-potassium (Co-Ni-Mo-K) catalyst for preparing low carbon alcohol by synthetic gas and a preparation method thereof, relates to a catalyst, and in particular relates to a Co-Ni-Mo-K catalyst for preparing low carbon alcohol by synthetic gas and a preparation method thereof, which is used for effectively improving selectivity and time space yield ofthe generated C2<+>alcohol when the synthetic gas is catalytically converted into low carbon mixed alcohol. The catalyst contains Co, Ni, Mo and K as well as a CNT (carbon nanotube) accelerator. The preparation method comprises the following steps: dissolving cobalt nitrate, nickel nitrate and ammonium molybdate in water, adding the obtained mixed solution to a container preloaded with a CNT, andthen adding aqueous ammonia to the container so as to separate out precipitates; filtering, washing, drying and baking the precipitates; and loading a K2CO3-containing aqueous solution on the baked precipitates by an isovolumetric impregnation method, drying and baking to obtain the Co-Ni-Mo-K catalyst for preparing the low carbon alcohol by the synthetic gas. The obtained Co-Ni-Mo-K catalyst hasthe advantage of high and stable activity; and the product-low carbon mixed alcohol has the advantages of high selectivity and good repeatability, and is convenient in manufacture, wherein, the time space yield of low carbon alcohol ether is obviously higher than that of the existing similar catalyst.

Description

technical field [0001] The invention relates to a catalyst for producing low-carbon alcohols from synthesis gas, especially a cobalt-nickel-molybdenum-potassium oxide catalyst promoted by carbon nanotubes. Background technique [0002] Low-carbon mixed alcohol refers to a series of alcohols containing at least 2 carbon atoms, such as ethanol, propanol, butanol, pentanol, hexanol, etc. (abbreviated as C 2+ -alcohol). Low-carbon alcohol is an important chemical raw material, and it has been proved to be a high-octane, low-pollution vehicle fuel additive. It can be mixed with gasoline to form an oil-alcohol hybrid fuel, and it can also be used directly alone (Chianelli R.R., et al. .Catal.Today 1994, 22(2):361-396), after the world experienced the second oil crisis in the late 1970s, the research on producing low-carbon alcohols from coal (or natural gas)-based syngas was once paid attention to And made some progress, but so far the low-carbon alcohol synthesis process, the s...

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Problems solved by technology

Low-carbon alcohol is an important chemical raw material, and it has been proved to be a high-octane, low-pollution vehicle fuel additive. It can be mixed with gasoline to form an oil-alcohol hybrid fuel, and it can also be used directly alone (Chianelli R.R., et al. .Catal.Today 1994, 22(2):361-396), after the world experienced the second oil crisis in the late 1970s, the research on producing low-carbon alcohols from coal (or natural gas)-based syngas was once paid attention to And made some progress, but so far the low-carbon alcohol synthesis process, the single-pass conversion rate of raw material synthesis gas and the generation of C 2+ -The selectivity of alcohols is all low, and the main product of most systems is still methyl alcohol (as on the molybdenum sulfide-based catalyst doped with alkali) (Herman R.G..Stud.Surf.Sci.Catal.1991,64:266-349 ) or low-carbon hydrocarbons (such as on modified FT synthesis catalysts) (Kiennemann A., et al..Stud.Surf.Sci.Catal.1993, 75:1479-1492), rather than low-carbon (C 2+ ) Alcohols (Slaa J.C., et al.. Catal. Today 1992, 15(1): 129-148; Forzatti P., et al.. Catal. Rev.-Sci. Eng. 1991, 33(1-2): 109-168; Stiles A.B., et al..Ind.Eng.Chem.Res.1991, 30(5):811-821), so far there is no large-scale production device in the world

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