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Low-temperature reduction type cobalt (Co)-based Fischer-Tropsch synthesis catalyst and preparation method thereof

A catalyst and reduction type technology, applied in the field of low temperature reduction type cobalt-based Fischer-Tropsch synthesis catalyst and its preparation, can solve the problems of dangerous storage and use, easy combustion, complicated activation treatment steps, etc. The effect of good Fischer-Tropsch reactivity

Inactive Publication Date: 2012-01-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP0261870B1 discloses the preparation of CoZnO catalyst by impregnating cobalt and co-precipitating Co and Zn on ZnO. Its activation treatment method for the catalyst is complicated. ℃ heat treatment for 6 hours, and then treated in a hydrogen atmosphere at 320 ℃ for 6 hours before use. Produce metal Co, which is very active and easy to burn when exposed to oxygen, which brings danger to storage and use
[0014] Aiming at the defect that the preparation method of the existing low-temperature reduction cobalt-based Fischer-Tropsch synthesis catalyst is complicated or the activation treatment steps are complicated, the present invention provides a Co / ZnO Fischer-Tropsch synthesis catalyst with a simple preparation method and low reduction temperature and a preparation method thereof

Method used

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  • Low-temperature reduction type cobalt (Co)-based Fischer-Tropsch synthesis catalyst and preparation method thereof
  • Low-temperature reduction type cobalt (Co)-based Fischer-Tropsch synthesis catalyst and preparation method thereof

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Effect test

Embodiment 1

[0031] 219.31g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 852g distilled water to make Zn(NO 3 ) 2 Mass concentration 15% zinc nitrate aqueous solution, 102.0g (NH 4 ) 2 CO 3 Dissolve in 531g distilled water to make 16% ammonium carbonate aqueous solution with mass concentration. Zinc nitrate aqueous solution and ammonium carbonate aqueous solution are simultaneously pumped into the sedimentation tank for co-precipitation reaction, the precipitation temperature is 50±2°C, the pH value is controlled at 6.2±0.2, and the reaction time is 36 minutes. The obtained precipitate was washed with distilled water until there was no ammonia odor, filtered, and the filter cake was dried at 120°C overnight, and then calcined at 500°C for 6 hours to obtain 60g of ZnO carrier, which was named carrier 1 # .

Embodiment 2

[0033] 73.1g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 250g distilled water to make Zn(NO 3 ) 2 Mass concentration 17% zinc nitrate aqueous solution, 35.42g (NH 4 ) 2 CO 3 Dissolve in 177g distilled water to make 17% ammonium carbonate aqueous solution with mass concentration. Zinc nitrate aqueous solution and ammonium carbonate aqueous solution are simultaneously pumped into the sedimentation tank for co-precipitation reaction, the precipitation temperature is 55±2°C, the pH value is controlled at 6.4±0.2, and the reaction time is 13 minutes. The obtained precipitate was washed with distilled water until there was no ammonia smell, filtered, and the filter cake was dried at 120°C overnight, and then calcined at 500°C for 6 hours to obtain 20g of ZnO carrier, which was named carrier 2 # .

Embodiment 3

[0035] 2.6g Co(NO 3 ) 2 ·6H 2 O was dissolved in 4.0g distilled water to make Co(NO 3 ) 2 Mass concentration 33% cobalt nitrate aqueous solution, the carrier 1 prepared in embodiment 1 # Shaped into 150-280μm particles, take 10.0g ZnO and put it into the above-mentioned cobalt nitrate aqueous solution, impregnate at 20℃ for 10h, put the carrier and impregnated liquid together in an oven at 120℃ to dry overnight, and then bake at 500℃ for 6h to obtain Co / ZnO catalyst , named Catalyst 3 # , the mass percentage of the active component Co of the catalyst is 5wt%.

[0036] Get respectively the catalyst 3 prepared by the above-mentioned method of 0.5g # Put it into a fixed-bed reactor (ZJGD-XJ2009-041, Tianjin Pengxiang Technology Co., Ltd.) for reduction with pure hydrogen. The reduction temperatures are 230°C, 250°C, 270°C and 300°C, and the reduction time is 6 hours. After the reduction Lower the temperature to 150°C in hydrogen, then switch to nitrogen purging for 0.5h, t...

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Abstract

The invention discloses a low-temperature reduction type cobalt (Co)-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The catalyst takes ZnO as a carrier and Co as an active ingredient; and the catalyst comprises 3-15wt% of Co and 85-97wt% of ZnO. The preparation method of the catalyst comprises the following steps of: carrying out coprecipitation reaction on a zinc nitrate aqueous solution and an ammonium carbonate aqueous solution to obtain ZnO, then loading Co on ZnO by an immersion method, drying at 120 DEG C, and then roasting at 500 DEG C to obtain the Co / ZnO Fischer-Tropsch synthesis catalyst. The catalyst and the preparation method have the following beneficial effects: by introducing Co by the immersion method, the content of Co can be accurately controlled, and the preparation method is easy to repeat and amplify; and the catalyst is suitable for reduction at low temperature, thus preventing Co from aggregation in the reduction process, being favorable for forming metallic Co with a small size, and ensuring the utilization ratio of Co in the reaction.

Description

(1) Technical field [0001] The invention relates to a hydrocarbon synthesis catalyst and a preparation method thereof, in particular to a low-temperature reduced cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. (2) Background technology [0002] Liquid fuel is the blood on which modern society depends, and it is mainly produced through crude oil refining and processing. In recent years, due to concerns about the prospect of crude oil supply, the price of liquid fuels has continued to rise. At the same time, the extensive use of liquid fuels has also brought serious environmental pollution problems. The establishment of sustainable clean liquid fuel production methods is the solution to the above two problems. effective means. [0003] The Fischer-Tropsch synthesis process refers to the conversion of carbon-containing resources such as coal, natural gas, and biomass into synthesis gas (CO and H 2 mixture), and then the synthesis gas is polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C10G2/00C07C1/04C07C9/04
Inventor 宁文生王小琴
Owner ZHEJIANG UNIV OF TECH
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