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Ruthenium-based Fischer-Tropsch synthesis catalyst as well as preparation method and application thereof

A technology of Fischer-Tropsch synthesis and Tropsch synthesis, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve problems such as uneven particle size distribution, low CO conversion rate, and easy aggregation

Pending Publication Date: 2020-09-22
SYNFUELS CHINA INNER MONGOLIA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above catalysts are prepared by traditional impregnation method. The active phase of the catalyst is easy to aggregate during the roasting reduction process, and the particle size distribution is uneven. The C5+ selectivity of the catalyst is as high as 93-96%. Although the C5+ selectivity is improved to a certain extent, the CO conversion rate lower

Method used

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  • Ruthenium-based Fischer-Tropsch synthesis catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1 prepares catalyst C-1

[0073] (1) Weigh 50g of commercially available alumina powder, the specific surface area of ​​which is 140m 2 / g, the pore volume is 0.60cm 3 / g, the average pore diameter is 17nm; according to the content of metal additive zinc as 2wt% (relative to the carrier), take 4.55g of zinc nitrate hexahydrate to prepare an aqueous solution, and impregnate the above-mentioned alumina carrier with equal volume at 25°C , standing for 3 hours; drying at 120°C for 12 hours; roasting at 500°C for 5 hours, and obtaining a modified carrier A containing metal oxides after roasting; the specific surface area of ​​the obtained modified carrier A was determined to be 136m 2 / g, the pore volume is 0.58cm 3 / g, the average pore diameter is 17nm.

[0074] (2) According to the ruthenium content of 2wt% (relative to the carrier), weigh 16g containing 5g Ru / 100g ruthenium nitrosyl nitrate solution and add it to 465.5g water to prepare aqueous solution B; t...

Embodiment 2

[0080] Embodiment 2 prepares catalyst C-2

[0081] (1) Weigh 50g of commercially available alumina powder, the specific surface area of ​​which is 140m 2 / g, the pore volume is 0.60cm 3 / g, the average pore diameter is 17nm; according to the manganese content of 1wt% (relative to the carrier), take 3.26g of 50% w / w manganese nitrate aqueous solution to prepare the aqueous solution, and impregnate the above-mentioned alumina powder with equal volume at 25°C , standing for 3h; drying at 120°C for 12h; calcining at 500°C for 5h, after calcining, a modified carrier A containing metal oxides was obtained; the specific surface area of ​​the obtained modified carrier A was 139m 2 / g, the pore volume is 0.59cm 3 / g, the average pore diameter is 17nm.

[0082](2) According to the ruthenium content of 2wt% (relative to the carrier), weigh 16g containing 5g Ru / 100g ruthenium nitrosyl nitrate solution and add it to 219.57g water to prepare aqueous solution B; the modified carrier obtai...

Embodiment 3

[0087] Embodiment 3 prepares catalyst C-3

[0088] (1) Weigh 50g of commercially available alumina powder, the specific surface area of ​​which is 140m 2 / g, the pore volume is 0.60cm 3 / g, the average pore diameter is 17nm; according to the lanthanum content of 1wt% (relative to the carrier), weigh 1.56g of lanthanum nitrate hexahydrate to prepare an aqueous solution, impregnate the above alumina powder with equal volume at 25°C, and let it stand for 3h ;Dried at 120°C for 12h; Roasted at 500°C for 5h to obtain a modified carrier A containing metal oxides; the specific surface area of ​​the modified carrier A obtained was determined to be 137m 2 / g, the pore volume is 0.59cm 3 / g, the average pore diameter is 17nm.

[0089] (2) According to the ruthenium content of 2wt% (relative to the carrier), weigh 16g containing 5g Ru / 100g ruthenium nitrosyl nitrate solution and add it to 108.61g water to prepare aqueous solution B; the modified carrier obtained in step (1) Add 40.47...

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Abstract

The invention discloses a ruthenium-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The ruthenium-based Fischer-Tropsch synthesis catalyst comprises ruthenium, a metal additive and a carrier. According to the preparation method of the catalyst provided by the invention, the active component ruthenium of the catalyst is directly reduced on the surface of the carrier through reduction reaction; therefore, the step of high-temperature roasting reduction after ruthenium loading in a traditional method is avoided, the sintering phenomenon of ruthenium in the repeated high-temperature roasting reduction process of the catalyst is avoided, and the utilization efficiency of ruthenium in the reaction is guaranteed. The method can inhibit active ruthenium substance sintering and inhibit composite oxide formation between the active phase and the carrier. The catalyst prepared by the method has the advantages of high activity, low methane selectivity, high heavy hydrocarbon selectivity and the like.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and specifically relates to a ruthenium-based Fischer-Tropsch synthesis catalyst, a method for preparing the ruthenium-based Fischer-Tropsch synthesis catalyst by in-situ reduction, and an application of the catalyst. Background technique [0002] Fischer-Tropsch synthesis (Fischer–Tropsch process, also known as F-T synthesis) is an important way to convert synthesis gas (with carbon monoxide and hydrogen as the main components) into liquid fuels. Improving the selectivity of C5+ hydrocarbons and suppressing the formation of by-products such as methane are the main research goals of F-T synthesis. The key step to achieve this goal is the research and development of high activity and high selectivity F-T synthesis catalysts. How to properly match various components in Fischer-Tropsch synthesis (such as active components, additives and supports) to prepare Fischer-Tropsch synthesis ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/50B01J23/58B01J23/60B01J23/63B01J23/656B01J35/10C10G2/00
CPCB01J23/60B01J23/6562B01J23/63B01J23/58B01J23/462B01J23/50C10G2/333B01J35/615B01J35/635B01J35/647
Inventor 黄礼春燕来周建强索海云郜文斌王缠和李国强杨勇
Owner SYNFUELS CHINA INNER MONGOLIA CO LTD