Catalyst for producing low-carbon olefins from syngas and preparation method thereof

A low-carbon olefin and catalyst technology, applied in the field of catalysts and their preparation, can solve the problems of easy flying temperature, low weight selectivity of low-carbon olefins, difficult reaction heat removal and the like

Active Publication Date: 2019-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by this invention is that the Fischer-Tropsch synthesis reaction exists in the prior art because the Fischer-Tropsch synthesis reaction is a strong exothermic reaction. The problem of low weight selectivity provides a new catalyst for the one-step direct production of low-carbon olefins from syngas

Method used

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  • Catalyst for producing low-carbon olefins from syngas and preparation method thereof
  • Catalyst for producing low-carbon olefins from syngas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dissolve 606.03g of ferric nitrate nonahydrate and 0.314g of rhodium trichloride in water to form a solution, then centrifuge the solution and 400g of 25% by weight of concentrated ammonia water and wash it three times with deionized water to obtain Mixed precipitation Ⅰ of fresh ferric hydroxide and rhodium oxide;

[0026] 2) 134.5g of 50% by weight of manganese nitrate and 3.13g of gallium nitrate nonahydrate were dissolved in water to make solution II;

[0027] 3) mixing and beating the solution II and the mixed sediment I to obtain a colloidal slurry III;

[0028] 4) Dissolve 0.042g of potassium hydroxide in water and add it to slurry III, mix and beat, adjust the pH value of the slurry to 5 with ammonia water, and obtain a uniform slurry that is uniformly dispersed in a sol state and will not be layered after a long period of storage Material IV (45% solid content);

[0029] 5) The slurry IV is spray-dried and molded. The inlet temperature of the sprayer is 38...

Embodiment 2

[0033] 1) Get 606.03g of ferric nitrate nonahydrate and 44.79g of iridium trichloride to be dissolved in water to form a solution, then the solution is centrifuged with 400g of 25% by weight concentrated ammonia water and washed three times with deionized water to obtain Mixed precipitation of fresh ferric hydroxide and iridium oxide I;

[0034]2) 1345g of 50% by weight manganese nitrate and 117.3g of indium nitrate pentahydrate were dissolved in water to make solution II;

[0035] 3) mixing and beating the solution II and the mixed sediment I to obtain a colloidal slurry III;

[0036] 4) Dissolve 4.20g of potassium hydroxide in water and add it to the slurry III, mix and beat, adjust the pH value of the slurry to 1 with dilute nitric acid, and obtain a uniform slurry that is uniformly dispersed in the form of a sol and will not be stratified after a long period of storage Material IV (15% solid content);

[0037] 5) Slurry IV is spray-dried and molded. The inlet temperature...

Embodiment 3

[0041] 1) Dissolve 367.43g of iron citrate and 1.57g of rhodium trichloride in water to form a solution, and then centrifuge the solution and 400g of 25% by weight of strong ammonia in parallel flow, and wash with deionized water three times to obtain fresh hydrogen Mixed precipitation of iron oxide and rhodium oxide Ⅰ;

[0042] 2) 269.0g of 50% by weight of manganese nitrate and 125.2g of gallium nitrate nonahydrate were dissolved in water to make solution II;

[0043] 3) mixing and beating the solution II and the mixed sediment I to obtain a colloidal slurry III;

[0044] 4) Dissolve 1.05g of sodium hydroxide in water and add it to slurry III, mix and beat, and at the same time adjust the pH of the slurry to 3 with dilute ammonia water to obtain a sol-like dispersion that is uniform and will not be layered after long-term storage. Slurry IV (solid content 35%);

[0045] 5) Slurry slurry IV is spray-dried and formed, the inlet temperature of the sprayer is 230°C, the outlet...

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Abstract

The invention relates to a catalyst for preparing low-carbon olefins from synthesis gas and a preparation method thereof. The catalyst for preparing the low-carbon olefins from the synthesis gas and the preparation method thereof mainly solve the problems that in the prior art, because the Fischer-Tropsch synthesis reaction is a strong exothermic reaction, in the process of using a fixed bed, heat is difficult to remove in a reactor, temperature runaway is easy, the catalyst tends to be inactive and the weight selectivity of the low-carbon olefins is low. According to the technical scheme, the catalyst adopted by the method comprises, in terms of atomic ratio, a composition with a chemical formula being Fe100MnaBbCcOx, wherein B is selected from at least one of Ga and In, and C is selected from at least one of Rh and Ir. The problems can be well solved through adopting the above technical scheme, and the catalyst can be applied to industrial production of preparing the low-carbon olefins from the synthesis gas through a one-step method.

Description

technical field [0001] The invention relates to a catalyst for low-carbon olefins in synthesis gas and a preparation method thereof Background technique [0002] Fischer-Tropsch (Fascher-Tropsch) synthesis is the use of synthesis gas (mainly composed of CO and H 2 ) in the process of synthesizing hydrocarbons under the action of a catalyst is an important way for the indirect liquefaction of coal and natural gas. This method was invented by German scientists Frans Fischer and Hans Tropsch in 1923, that is, CO undergoes a heterogeneous catalytic hydrogenation reaction on a metal catalyst to generate a mixture mainly of linear alkanes and alkenes. [0003] Germany carried out the research and development of Fischer-Tropsch synthesis in the 1920s, and realized industrialization in 1936. After World War II, it was closed because it could not compete with the oil industry economically; South Africa has abundant coal resources, but oil resources Insufficient plaques and long-ter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C07C1/04C07C11/04C07C11/06C07C11/08C10G2/00
CPCY02P20/52
Inventor 庞颖聪陶跃武宋卫林李剑锋
Owner CHINA PETROLEUM & CHEM CORP
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