Catalyst for synthesis of gas produced low-carbon alcohol ether and production method thereof

A catalyst and synthesis gas technology, which is applied in the field of nickel-molybdenum-potassium oxide catalyst and its preparation, can solve the problem of low selectivity and achieve the effects of high selectivity, stable activity and easy production

Inactive Publication Date: 2009-05-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the world experienced the impact of the second oil crisis in the late 1970s, the research on producing low-carbon mixed alcohols from coal (or natural gas)-based synthesis gas has once received attention and made some progress. However, the low-carbon alcohol synthesis process so far, The single-pass conversion rate of raw syngas and the formation of C 2+ -Alcohol selectivity is low, and the main product of most systems is still methanol (such as on alkali-doped molybdenum sulfide-based catalysts) or low-carbon hydrocarbons (such as on modified FT synthesis catalysts), rather than low-carbon hydrocarbons. Carbon (C 2+ ) alcohol (Herman R G.Stud.Surf.Sci.Catal.1991,64:266-349; 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; Dalmon J A, et al., Catal Today 1992, 15(1): 101-127; Chaumette P , et al., Ind.Eng.Chem.Res.1994, 33(6):460-467), there is no large-scale production device in the world so far

Method used

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  • Catalyst for synthesis of gas produced low-carbon alcohol ether and production method thereof
  • Catalyst for synthesis of gas produced low-carbon alcohol ether and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 0.150g of potassium hydroxide (KOH, grade AR in purity) into a 100mL glass filled with 50mL of ethylene glycol (grade in purity AR), stir until potassium hydroxide is completely dissolved, add 0.311g of nickel acetate (Ni(Ac ) 2 4H 2 O, the purity is AR grade), stirred until the nickel acetate was completely dissolved, added 1.223g of purified CNT, and the feed liquid was ultrasonically treated for 30min, and then placed in a microwave oven (2450MHz, 640W); heated by microwave radiation for 100s, cooled 20s, reheated for 10s, repeated cooling for 20s, reheated for 10s, took out the feed liquid and placed it in a cold water bath to let it cool rapidly, the feed liquid was filtered, and the filter cake was washed successively with acetone and deionized water until the filtrate was neutral. After drying at 110°C, metal Ni-modified CNTs were obtained, and the stoichiometric formula was determined to be 4.8% Ni / CNT through chemical analysis.

[0026] At 80°C, 5.296g ...

Embodiment 2

[0031] At 80°C, 5.296g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, the purity is AR grade) and 8.724g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 (2, the purity is AR grade) aqueous solution (about 100mL each in volume) isochronously and dropwise added into a glass container pre-installed with 0.564g pure CNT for co-precipitation reaction. After stirring for 1h, ammonia water was added dropwise under strong stirring to Precipitate and adjust and keep the pH value of the solution equal to 5, stop heating after 3 hours to let it cool down naturally, stop stirring after 1 hour, and let it stand for 4 hours; the precipitate is suction filtered, washed with deionized water, and washed until the filtrate is neutral After drying at 110°C for 6 hours, pure N 2 Roast at 575°C for 4 hours in the atmosphere, and then use the isovolumic impregnation method to add 0.104g of potassium carbonate (K 2 CO 3 , the purity is AR grade) aqueous solution impregnated on the calcined precipitate, ...

Embodiment 3

[0034] At 90°C, 5.296g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, the purity is AR grade) and 6.543g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 (2, purity is AR grade) aqueous solution (about 100mL each in volume) isochronously, and dropwise add in the glass container of the pure CNT that has not been modified by Ni in advance of 0.511g to carry out co-precipitation reaction, after stirring for 1h, in strong Add ammonia water dropwise under stirring to precipitate precipitates and adjust and keep the pH value of the solution equal to 5. After 3 hours, stop heating and let it cool down naturally. After 1 hour, stop stirring and let it stand for 4 hours; Until the filtrate is neutral, dry at 115°C for 5h, pure N 2 Roast at 550°C for 5 hours in the atmosphere, and then add 0.104g of potassium carbonate (K 2 CO 3 , purity is AR grade) aqueous solution impregnated on the calcined precipitate, dried at 115°C for 5h, pure N at 425°C 2 Roasting in the atmosphere for 4h, the stoi...

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Abstract

The invention provides a catalyst for synthesis of low-carbon alcohol ether from syngas and a preparation method thereof, particularly a carbon nanotube-based nanomaterial-promoted Ni-Mo-K oxide catalyst for synthesis of low-carbon alcohol ether from syngas and a preparation method thereof. The catalyst contains a Ni-Mo-K oxide and a carbon nanotube-based nanomaterial promoter, and has a chemical formula as follows: NiiMojKk-x% (CNT or y%Ni/CNT), wherein the subscripts I, j and k are the molar ratio coefficients of the related metal elements in the Ni-Mo-K oxide, and x% is the mass percentage of the promoter in the catalyst. The component percentages of the catalyst are as follows: 20% to 50% of Ni, 35% to 70% of Mo, 0% to 3% of K, and 8% to 16% of the promoter. The catalyst is prepared by firstly allowing the precipitation reaction between Ni, Mo and the promoter, then loading K to the reaction product by impregnation method and finally oven-drying and calcining.

Description

technical field [0001] The invention relates to a catalyst, in particular to a nickel-molybdenum-potassium oxide catalyst promoted by carbon nanotube-based nanomaterials for producing low-carbon alcohol ethers from synthesis gas and a preparation method thereof. Background technique [0002] Coal-based low-carbon alcohol ether fuels (including methanol, low-carbon mixed alcohols and dimethyl ether) are fuel chemicals with strategic significance based on the diversification of energy and chemical raw materials. Methanol and low-carbon mixed alcohols (refers to a series of alcohols containing at least 2 carbon atoms, such as mixtures of ethanol, propanol, butanol, pentanol, hexanol, etc., abbreviated as C 2+ -alcohol) have been proved to be high-octane, low-pollution automotive synthetic fuels, which can be blended with gasoline to form an oil-alcohol hybrid fuel, and can also be used directly alone (Chianelli R R, et al., Catal Today 1994, 22(2): 361-396); Dimethyl ether (ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887B01J23/883C07C29/153C07C41/01
Inventor 张鸿斌马春辉李海燕林国栋
Owner XIAMEN UNIV
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