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Silicon-modified Fischer-Tropsch synthesis catalyst and application thereof

A technology of Fischer-Tropsch synthesis and catalyst, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as harsh temperature control and complicated preparation process, and achieve Good stability and catalytic performance, high wear resistance

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process is complex and the temperature control is strict

Method used

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  • Silicon-modified Fischer-Tropsch synthesis catalyst and application thereof

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preparation example Construction

[0016] The Fischer-Tropsch synthesis catalyst provided by the invention comprises a carrier containing alumina, an active metal component selected from iron and / or cobalt and auxiliary agent silicon, based on the total amount of the catalyst, the content of the active metal component in terms of elements is 10 to 60% by weight, more preferably 15 to 50% by weight, the carrier content is 40 to 90% by weight, more preferably 50 to 85% by weight; it is characterized in that the preparation method of the catalyst comprises:

[0017] (1) loading the active metal component on the carrier containing alumina, then drying, roasting or not roasting;

[0018] (2) adding the product of step (1) into the solvent, and the solid content in the obtained mixed system is 1 to 50% by weight;

[0019] (3) Add silicon ester and alkaline substance to the mixed system of step (2) to react. The operating conditions of the reaction include: the temperature is 0-100°C, the time is 0.5-10h, and the amou...

Embodiment 1

[0032] Example 1: 144 g of cobalt nitrate hexahydrate and 4.30 g of zirconyl nitrate dihydrate were dissolved in 50 mL of deionized water, and 9.51 g of ruthenium nitrosyl nitrate solution containing 1.5 wt % of Ru were added to obtain an impregnation solution. 100g of alumina carrier (average particle size 77μm, specific surface area 175m 2 / g, pore volume 0.72mL / g) was dispersed in the impregnating solution at room temperature and stirred for 1 h, and then rotary evaporated to obtain a dried catalyst sample. After the sample was dried at 120 °C for 2 h, it was calcined at 350 °C for 2 h to obtain a catalyst precursor.

[0033] Add 300g of pure water and 100g of the above-mentioned catalyst precursor into a 500mL stirred reactor, control the stirring rate to 400r / min, then add an appropriate amount of ammonia water until the pH value is 10.8, and finally add 12.1g of ethyl orthosilicate, and react at room temperature for 2 hours , the reaction system was vacuum filtered, drie...

Embodiment 2

[0039] Example 2: 423.5 g of cobalt nitrate hexahydrate and 13.10 g of zirconyl nitrate dihydrate were dissolved in 250 mL of deionized water, and 1.2 g of platinum dichlorodiammine solution containing 1.05 wt % of Pt was added to obtain an impregnation solution. Divide four times into 100g alumina (average particle size 139μm, specific surface area 60m 2 / g, pore volume 0.25mL / g), dry catalyst samples were obtained by rotary evaporation, each sample was dried at 180°C for 4 hours to obtain a catalyst precursor, the formula was 0.005Pt38.7Co1.6Zr / M, M contained alumina carrier.

[0040] Add 130g of pure water, 100g of absolute ethanol and 100g of the above-mentioned catalyst precursor into a 500mL stirring reaction kettle, control the stirring rate at 300r / min, then add an appropriate amount of ammonia water until the pH value is 13.5, and finally add 45g of tetraethyl orthosilicate, 60 °C for 4 hours, vacuum filtered, and dried at 200 °C for 12 hours. A modified catalyst wi...

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Abstract

The invention relates to a silicon-modified Fischer-Tropsch synthesis catalyst and application thereof. The catalyst is prepared from an alumina-containing carrier, active metal components selected from iron and / or cobalt, and an auxiliary silicon. The catalyst preparation method comprises the steps that: (1) the active metal components are loaded onto the alumina-containing carrier; (2) a productof the step (1) is added to a solvent, and a solvent content of an obtained mixed system is 50 to 99 percent by weight; (3) silicon ester and alkaline substances are added to the mixed system of thestep (2) for reaction, wherein the weight ratio of addition of the silicon ester based on elemental silicon to the alumina in the carrier is (0.003 to 0.06) to 1, and the addition of the alkaline substances enables pH value of the mixed system to be 8 to 14; (4) the reacted mixed system is subjected to solid-liquid separation, and obtained solid is dried, calcined or not-calcined to obtain the catalyst. The preparation method of the catalyst provided by the invention is simple. Compared with the prior art, the catalyst of the invention has the characteristics of high abrasion resistance, highactivity, good selectivity and stability and the like.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis catalyst and its application. Background technique [0002] Fischer-Tropsch synthesis refers to the reaction in which synthesis gas is converted into hydrocarbons on a catalyst. The products mainly include alkanes and olefins. After deep processing, high-quality liquid fuels and high value-added chemicals can be prepared. It is one of the important technologies for the clean utilization of coal . [0003] Fischer-Tropsch synthesis is a strong exothermic reaction, so a slurry bed with better heat transfer has obvious advantages in low-temperature Fischer-Tropsch synthesis compared to a fixed-bed reactor. However, the catalyst is easily deactivated in the slurry bed reactor, which affects the stable operation of the reaction; in addition, the collision and friction between the catalysts is very serious, which is easy to produce fine powder, which affects the separation of the generated wax and the cat...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/89B01J23/83C10G2/00
CPCB01J23/462B01J23/83B01J23/8913C10G2/332C10G2300/70
Inventor 吴玉晋超夏国富孙霞侯朝鹏李学锋曾双亲
Owner CHINA PETROLEUM & CHEM CORP
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