Catalyst used for preparing methane by using synthesis gas and preparation method thereof

A catalyst and synthesis gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problem, to achieve the effect of good activity and selectivity, large specific surface area and good thermal stability

Inactive Publication Date: 2010-09-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Good methane conversion and selectivity at low temperatures, but thermal stability is not ideal, and the use of precious metals adds cost
Chinese patent CN 101185892A prepared Ni / ZrO 2 Catalyst, which can reduce the CO content in hydrogen-rich gas to below 100ppm, but it is not suitable for high CO concentration, high space velocity feed gas, GHSV at 12000h -1 within
However, during co-precipitation, the particles are easy to agglomerate, the catalyst life is short, and it is easy to deactivate

Method used

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  • Catalyst used for preparing methane by using synthesis gas and preparation method thereof
  • Catalyst used for preparing methane by using synthesis gas and preparation method thereof
  • Catalyst used for preparing methane by using synthesis gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 53.6g of aluminum nitrate nonahydrate, 7.8g of nickel nitrate hexahydrate, 2.56g of magnesium nitrate, 0.2g of lanthanum nitrate, and 0.127g of sodium nitrate and dissolve them in 50ml of deionized water, stir the solution and heat to 60°C. If there are some insoluble particles, use a funnel to filter to prevent particle aggregation and nucleation during co-precipitation. Weigh 22.6g of urea, raise the temperature of the solution to 90°C, add 1ml of polyethylene glycol (PEG-200) as a dispersant, gradually add the required urea into the solution, and stir vigorously. Urea decomposes into ammonia and CO at high temperature 2 , the color of the solution gradually changed from light green to dark green. Check the pH of the solution, if the pH drops to around 6.5, the precipitation is complete.

[0024] Filter the remaining solution, place it in a desiccator at 120°C for 5 hours, then transfer it to a muffle furnace for calcination, the calcination temperature is 500...

Embodiment 2

[0027] Weigh 53.6g Al(NO 3 ) 3 9H 2 O, 7.8g Ni(NO 3 ) 2·6H 2 O, 2.56g Mg(NO 3 ) 2 ·6H 2 O, 0.2g La(NO 3 ) 3 ·6H 2 O, 0.102g Sr(NO 3 ) 2 Dissolve in 50 ml of deionized water, stir the solution and heat to 60°C. Weigh 14.56g NH 4 HCO 3 solid, the temperature of the solution was raised to 90° C., 1 ml of polyethylene glycol (PEG-200) was added as a dispersant, and the weighed ammonium bicarbonate was gradually added to the solution and stirred vigorously. As the ammonium bicarbonate is decomposed by heat, the color of the solution gradually changes to dark green. When the pH value of the solution drops to about 6.5, the precipitation is basically complete. Filter off the remaining solution, dry in a desiccator at 120°C for 5 hours, then transfer to a muffle furnace for calcination, the calcination temperature is 500°C and maintain for 4 hours, after calcination, crush the catalyst particles and filter with a 200-mesh sieve. A methanation catalyst is obtained. Th...

Embodiment 3

[0030] Nanoparticles are prepared by the water-in-oil (W / O) microemulsion method. The surface of the particles is coated with a layer of surfactant, which makes it difficult for the particles to agglomerate, and the size of the particles can be controlled by selecting different surfactant molecules. Prepare the microemulsion of water phase-SDS-isopropanol-cyclohexane according to the principle of microemulsion method, wherein the water phase is 51.4gAl(NO 3 ) 3 9H 2 O, 5.85g Ni(NO 3 ) 2 ·6H 2 O, 3.88g Co(NO 3 ) 2 ·6H 2 O mixed ionic solution. Wherein SDS is a surfactant, isopropanol is a co-surfactant, and cyclohexane is an organic phase. In addition, 25g of NaOH was weighed and dissolved in deionized water, and the NaOH solution was slowly added dropwise into the microemulsion in the air while vigorously stirring, and flocculent precipitates were formed. Continue to stir vigorously for 30 minutes after the dropwise addition, age for 1 hour, then centrifuge to separat...

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Abstract

The invention discloses a catalyst used for preparing methane by using a synthesis gas and a preparation method thereof. The catalyst has the characteristics of high thermal stability, high catalytic activity, high methane space time yield and the like. The preparation method is characterized in that: in a preparation process of the catalyst, urea or NH4CO3 is heated to decompose so as to generate ammonia and CO2; on one hand, the ammonia and an active ingredient nickel salt of the catalyst form a complex compound; and on the other hand, the production of a large amount of gas aggravates the dispersion of particles, so that a porous surface is formed easily and catalyst activity is enhanced. Due to the addition of a proper amount of alkali metals such as Mg, Na and the like and rare earth elements such as La and the like, the thermal stability and the anti-carbon property of the catalyst can be improved. A finished product catalyst comprises the following components in percentage by mass: 75 to 85 percent of Al2O3, 15 to 25 percent of NiO, 1 to 5 percent of MgO, 0.5 to 3 percent of La2O3, and 0.2 to 1 percent of Na2O; the specific surface of the catalyst is 223 m<2> / g; and the pore volume is 0.16 to 0.20 cm<2> / g.

Description

technical field [0001] The invention relates to a catalyst in the process of producing methane from synthetic gas and a preparation method thereof, and is especially suitable for large-scale coal-to-natural gas process. technical background [0002] Utilizing my country's abundant coal resources and developing coal-based natural gas is an effective way to solve the current contradiction between my country's natural gas supply and demand. Not only can alternative natural gas be used interchangeably with natural gas, but it can also be delivered in the same way. Carbonaceous raw materials are gasified, H in the synthesis gas 2 Alternative natural gas can be produced by adjusting the ratio with CO, removing acid gas, and methanation reaction. The coal-to-natural gas process technology is relatively simple, the waste water does not contain harmful substances, the by-product high-pressure steam can be used to drive the air separation turbine and generate electricity, and the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C07C9/04C07C1/04
Inventor 王兴军于广锁王辅臣龚欣刘海峰王亦飞代正华陈雪莉周志杰李伟锋郭晓镭梁钦锋许建良郭庆华
Owner EAST CHINA UNIV OF SCI & TECH
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