Cobalt-based Fischer-Tropsch synthesis catalyst and preparation method thereof

A technology for catalyst and Tropsch synthesis, which is applied in the field of cobalt-based Fischer-Tropsch synthesis catalyst and its preparation, can solve the problems of increasing energy consumption and easily destroying the pore structure of the carrier, and achieves sintering prevention, process saving, good heat resistance stability and chemical The effect of stability

Active Publication Date: 2019-09-24
滕州京腾鑫汇新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has a high specific surface area of ​​cobalt, and the dispersion of cobalt is good, but due to the high reduction temperature required for its preparation, it increases energy consumption and easily destroys the pore structure of the carrier.
[0010] In general, there are still many shortcomings in the catalytic performance of the existing cobalt-based catalysts for Fischer-Tropsch synthesis and the production cost required for the preparation process. Industrial production of gas-to-liquids provides more favorable support

Method used

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  • Cobalt-based Fischer-Tropsch synthesis catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0059] According to 12wt% of the catalyst weight, Co in the catalyst, ZrO in the carrier 2 The content accounts for 5wt%, weighs Co(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Zr(NO 3 ) 4 ·5H 2 O is added with deionized water to prepare a mixed solution; the cobalt ion concentration in the mixed solution is 0.15mol / L, the aluminum ion concentration is 1.8mol / L, and the zirconium ion concentration is 0.01mol / L.

[0060] Add the mixed solution and the ammonium oxalate precipitant solution into the reactor in parallel, then add sodium carbonate to keep the pH value at 7.5; heat to 35°C during the coprecipitation process; after the coprecipitation, age at 70°C for 8 hours, and then filter with suction The filter cake was obtained and washed; the filter cake was dried at 80°C for 12h, then roasted at 400°C for 6h under the protection of nitrogen atmosphere, and then cooled to room temperature to obtain the catalyst product.

[0061] As measured by TEM, the cobalt crystallite siz...

Embodiment 2

[0063] According to 18wt% of the catalyst weight, Co in the catalyst, ZrO in the support 2 The content accounts for 7.5wt%, weighs Co(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Zr(NO 3 ) 4 ·5H 2 O is added with deionized water to prepare a mixed solution; the cobalt ion concentration in the mixed solution is 0.3mol / L, the aluminum ion concentration is 1.2mol / L, and the zirconium ion concentration is 0.02mol / L.

[0064] Add the mixed solution and the ammonium oxalate precipitant solution into the reactor in parallel, and then add sodium carbonate to keep the pH value at 8.0; heat to 40°C during the coprecipitation process; after the coprecipitation, age at 75°C for 6h, and then filter with suction The filter cake was obtained and washed; the filter cake was dried at 100°C for 7 hours, then roasted at 350°C for 7 hours under the protection of nitrogen atmosphere, and then cooled to room temperature to obtain the catalyst product.

[0065] As measured by TEM, the diameter of ...

Embodiment 3

[0067] According to the 26wt% of the catalyst weight, Co in the catalyst, ZrO in the support 2 The content accounts for 9.5wt%, weighs Co(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Zr(NO 3 ) 4 ·5H 2 O is added with deionized water to prepare a mixed solution; the cobalt ion concentration in the mixed solution is 0.35mol / L, the aluminum ion concentration is 0.8mol / L, and the zirconium ion concentration is 0.07mol / L.

[0068] Add the mixed solution and the ammonium oxalate precipitant solution into the reaction kettle in parallel, then add sodium carbonate to keep the pH value at 8.3; heat to 45°C during the coprecipitation process; after the coprecipitation, age at 80°C for 4 hours, and then filter with suction The filter cake was obtained and washed; the filter cake was dried at 90°C for 8h, then roasted at 450°C for 5h under the protection of nitrogen atmosphere, and then cooled to room temperature to obtain the catalyst product.

[0069] As measured by TEM, the diameter ...

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Abstract

The invention belongs to the field of catalysts, and particularly relates to a cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The catalyst comprises 10-30 wt% of metal cobalt and the balance of an oxide carrier, wherein the microcrystal particle size of the metal cobalt is 6.5-7.5 nm, the oxide carrier is composed of Al2O3 and ZrO2, and the content of ZrO2 accounts for 5-10 wt% of the weight of the carrier. According to the method, a co-precipitation method is used for producing the catalyst. Oxalic acid or an oxalate and an alkaline precipitant are used as a precipitant system in a co-precipitation process, and then roasting is carried out in an inert atmosphere. CO generated by oxalic acid decomposition in the roasting process is used as reducing gas, and roasting and reduction can be carried out synchronously, so that active component cobalt in the prepared cobalt-based catalyst can be uniformly dispersed, the acting force between cobalt and the oxide carrier is moderate, and the catalyst has proper activity, C<5+> selectivity and service life on the whole.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] The overall situation of my country's energy structure is "rich in coal, poor in oil, and low in gas". With the sustained and rapid development of my country's economy, my country's dependence on foreign oil continues to increase, reaching 67% in 2017, which has become the foundation for the sustained and healthy development of my country's economy. One of the bottlenecks. Coal, as the main energy source in my country, is one of the important ways to solve the shortage of liquid fuel supply by using coal as raw material to produce synthesis gas, and then generate liquid hydrocarbons through Fischer-Tropsch synthesis reaction, which is very important for ensuring national energy security and promoting social and economic sustainability. , Scientific development has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C10G2/00
CPCB01J23/002B01J23/75B01J2523/00C10G2/332B01J2523/31B01J2523/48B01J2523/845
Inventor 王计奎
Owner 滕州京腾鑫汇新材料科技有限公司
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