Catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as preparation method and application of catalyst

A technology for Fischer-Tropsch synthesis and low-carbon olefins, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem that the selectivity of target products is not too large Improvement, target product yield reduction, CO conversion rate decline, etc., to achieve good thermal stability and chemical stability, wide selection of raw materials, and moderate combination

Active Publication Date: 2015-12-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-based catalysts have higher selectivity of reaction products only when the temperature is lower, and the reaction rate will be significantly reduced when the temperature is lower, which makes the selectivity of the target product not only not greatly improved, but the reaction On the contrary, the rate drops sharply, leading to a sharp drop in the CO conversion rate. The combination of the two will lead to a significant decrease in the yield of the target product (yield=selectivity*conversion rate), and at the same time, the lower temperature will also cause olefins in the product content will be lower

Method used

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  • Catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as preparation method and application of catalyst
  • Catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as preparation method and application of catalyst
  • Catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The purpose of this embodiment is to provide 10Fe·1.4K·3Mn·85.6 (50MgO·50Al 2 o 3 ) Catalyst preparation.

[0075] a) Accurately weigh 7.222g of magnesium nitrate hexahydrate [Mg(NO 3 ) 2 ·6H 2 O] and 21.146g of aluminum nitrate nonahydrate [Al(NO 3 ) 3 9H 2 O], add a certain amount of deionized water after mixing, and stir until completely dissolved at 60°C;

[0076] b) Accurately weigh 26.800 g of complexing agent ethylenediaminetetraacetic acid (EDTA) at room temperature, add an appropriate amount of deionized water and stir at 60°C, add ammonia water drop by drop until the powder is completely dissolved, and continue stirring;

[0077] c) Slowly add the solution in step a) into the solution in step b) at a constant temperature of 60°C, and keep stirring, raise the temperature of the mixture system to 80°C, and continue stirring until it becomes viscous and a small amount of solid insoluble matter appears;

[0078] d) Dry the mixture in an oven at 100-140°C o...

Embodiment 2-23

[0087] The purpose of this embodiment is to provide 10Fe·1.4K·3Mn·85.6 (50MgO·50Al 2 o 3 ) Catalyst preparation.

[0088] According to the conditions of each step in Example 1, only the catalyst carrier magnesium source, aluminum source, and complexing agent were changed. The specific reagents used are shown in Table 1.

[0089] Wherein, the X-ray powder diffraction pattern of the catalyst carrier prepared in embodiment 7, such as figure 2 shown.

[0090] Table 1 Example 2-23 Reagents used

[0091] Example

[0092] 17

Embodiment 24-42

[0094] The purpose of this embodiment is to provide 10Fe·1.4K·3Mn·85.6 (50MgO·50Al 2 o 3 ) Catalyst preparation.

[0095] According to the conditions of each step in Example 1, only the iron source, potassium source, and manganese source required for the preparation of the catalyst were changed. The specific reagents used are shown in Table 2.

[0096] Table 2 embodiment 24-42 uses reagent

[0097] Example

[0098] 39

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Abstract

The invention relates to a catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as a preparation method and an application of the catalyst. The catalyst comprises a metal Mg-Al composite oxide as well as Fe, K and Mn metal elements loaded on the metal Mg-Al composite oxide, wherein the chemical general formula of the metal Mg-Al composite oxide is aMgO*bAl2O3, a and b represent mole fractions of MgO and Al2O3 in the metal Mg-Al composite oxide respectively, a is larger than 0 and smaller than 100, b is larger than 0 and smaller than 100, and the sum of a and b is 100; the chemical general formula of the catalyst is xFe*yK*zMn*(100-x-y-z)(aMgO*bAl2O3), x, y and z represent mass fractions of the Fe, K and Mn metal elements loaded in the catalyst respectively, x is larger than 0 and smaller than or equal to 20, y is larger than 0 and smaller than or equal to 3, and z is larger than 0 and smaller than or equal to 15. Compared with the prior art, the catalyst as well as the preparation method and the application thereof has the advantages that the preparation technology is simple, conditions are mild, the controllability is good, the raw material selection range is wide, the economic cost is low, and the prepared catalyst is good in activity, high in selectivity, good in reaction stability and applicable to preparation of the light olefins through industrial Fischer-Tropsch synthesis and has the bright application prospect.

Description

technical field [0001] The invention belongs to the technical field of Fischer-Tropsch synthesis, and relates to a catalyst for preparing low-carbon olefins by Fischer-Tropsch synthesis, a preparation method and application thereof. Background technique [0002] At present, the energy used by humans is mainly fossil fuels, mainly including coal, oil, natural gas, etc., and as far as the current situation is concerned, this situation will not change significantly for a long time. In 1923, two scientists from Germany, Frans Fischer and HansTropsch, invented the Fischer-Tropsch synthesis method. In order to commemorate their contributions, the method was named after the two scientists, called Fischer-Tropsch Synthesis, referred to as Fischer-Tropsch synthesis or F-T synthesis. . The main process is as follows: firstly, natural gas, coal or biomass (such as lignin, cellulose, hemicellulose) and other raw materials undergo a series of chemical reactions to generate synthesis gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10C07C11/02C07C4/06
Inventor 王郁肖文德陈家驰裴康康
Owner SHANGHAI JIAO TONG UNIV
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