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Cobalt-based catalyst reduction processing method used for Fischer-Tropsch synthesis

A cobalt-based catalyst and Fischer-Tropsch synthesis technology, applied in the field of coal chemical industry, can solve the problems of large influence on reaction performance, growth of catalyst particles, decline in catalyst activity, etc., to promote high dispersion, mild and controllable reduction conditions, and prolong life Effect

Inactive Publication Date: 2015-08-05
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the composition of this type of catalyst has undergone a lot of screening, and its composition and spatial distribution have been basically determined, but the subsequent calcination and reduction are often not noticed by people, but this part has a greater impact on the reaction performance
The reduction process is mainly to convert the oxidation state of the catalyst into a metal state under the condition of hydrogen, which is usually completed under normal pressure and high temperature under the condition of hydrogen to prevent explosion. decline

Method used

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  • Cobalt-based catalyst reduction processing method used for Fischer-Tropsch synthesis
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  • Cobalt-based catalyst reduction processing method used for Fischer-Tropsch synthesis

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Effect test

Embodiment 1

[0016] Co / ZrO after calcination 2 -SiO 2 Catalyst (300 DEG C, sieving to obtain particle diameter is 40~60 orders, 1.2g, wherein Co content is 20wt%, Zr content is 5%, and the remainder is SiO 2 ) mixed with quartz sand evenly, filled into an isothermal reactor, and pretreated with atmospheric hydrogen at 220°C and a space velocity of 2000kg / (h.L) for 24 hours; then the gas was switched to 10% CO and 90% H 2 Adjust the temperature to 195°C, adjust the pressure to 0.5MPa, keep the space velocity at 4000kg / (h.L), and reduce for 24h. CO and H in the mixed gas 2 The molar ratio is switched to 1:2, the temperature is adjusted to 205°C, the pressure is adjusted to 3.0MPa, the space velocity is adjusted to 3000kg / (h.L), and the Fischer-Tropsch synthesis reaction is carried out. The reaction results are shown in Table 1, and the performance curve of the catalyst is shown in figure 1 .

Embodiment 2

[0018] Co / ZrO after calcination 2 -SiO 2 Catalyst (300 DEG C, sieving to obtain particle diameter is 40~60 orders, 1.2g, wherein Co content is 20wt%, Zr content is 5%, and the remainder is SiO 2 ) mixed with quartz sand evenly, filled into the isothermal reactor, first pretreated with atmospheric hydrogen at 220°C and space velocity of 2000kg / (h.L) for 24h, then gradually raised the temperature to 400°C, and kept the space velocity at 4000kg / (h.L), reduction for 24h. CO and H in the mixed gas 2 The molar ratio is switched to 1:2, the temperature is adjusted to 205°C, the pressure is adjusted to 3.0MPa, the space velocity is adjusted to 3000kg / (h.L), and the Fischer-Tropsch synthesis reaction is carried out. The reaction results are shown in Table 1, and the performance curve of the catalyst is shown in figure 2 . control figure 1 and figure 2 It can be seen that compared with the catalyst (embodiment 2) processed by the low-temperature pressurized reduction procedure ...

Embodiment 3

[0020] Co / ZrO after calcination 2 -TiO 2 Catalyst (300 DEG C, sieving to obtain particle diameter is 40~60 orders, 1.2g, and wherein Co content is 20wt%, Zr content is 5%, and remainder is TiO 2 ) mixed with quartz sand evenly, packed into an isothermal reactor, and pretreated with atmospheric hydrogen at 220°C and a space velocity of 2000kg / (h.L) for 24 hours; then the gas was switched to 5% CO and 95% H 2 Adjust the temperature to 200°C, adjust the pressure to 1.0MPa, keep the space velocity at 4000kg / (h.L), and reduce for 24h. CO and H in the mixed gas 2 The molar ratio was switched to 1:2, the temperature was adjusted to 205°C, the pressure was adjusted to 3.0MPa, the space velocity was adjusted to 3000kg / (h.L), and the Fischer-Tropsch synthesis reaction was carried out. The reaction results are shown in Table 1.

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Abstract

The invention discloses a cobalt-based catalyst reduction processing method used for Fischer-Tropsch synthesis, which is characterized in that 1-3% of CO-containing hydrogen is taken as a reducing gas for processing a roasted cobalt-based catalyst, reduction condition is characterized in that temperature is between 190 DEG C and 250 DEG C, pressure is between 0.1-3.0MPa, time is 16-48 hours, and air speed is 1000-10000kg / hL. According to the invention, the Co-based catalyst is reduced by CO-containing hydrogen at low temperature through pressurization, activity, stability and selectivity on heavy hydrocarbon of the catalyst are increased, the catalyst is used for heavy hydrocarbon prepared by synthetic gas, CO conversion rate can reach 40-60%, and the method has good industrial application prospect.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a reduction treatment method of a cobalt-based catalyst used for Fischer-Tropsch synthesis. Background technique [0002] With the depletion of world oil resources, future energy consumption will be dominated by coal and natural gas. In view of my country's national conditions of rich coal, little oil, and poor gas, the development of coal chemical technologies such as coal-to-oil and coal-to-gas is very important and has market prospects. This is also one of the important ways to ensure my country's energy security. [0003] Coal gasification to synthesis gas (the main components are CO, H 2 , with a small amount of CO 2 , N 2 , O 2 Or sulfide) technology development has been relatively mature. The production of heavy hydrocarbons from syngas refers to the reaction of syngas to generate heavy hydrocarbons (C 5 ~C 50 ) process, also known as Fischer-Tropsch synthesis....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/18B01J23/75C10G2/00
Inventor 赵铁均金贻星李小鹏杜福平孙予罕肖亚宁刘斌王东飞
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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