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Catalyst for preparing low-carbon olefin from synthesis gas 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 deactivation of catalysts, low yield of low-carbon olefins, easy flying temperature and the like

Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the Fischer-Tropsch synthesis reaction in the prior art is a strong exothermic reaction. When a fixed bed is used, it is difficult to remove heat from the reaction, and it is easy to overheat, so that the catalyst is easily deactivated and the yield of low-carbon olefins is low. To solve the problem, a new catalyst and method for producing low-carbon olefins from synthesis gas is provided. The catalyst has the advantages of fast reaction heat removal, not easy to overheat and high weight selectivity of low-carbon olefins

Method used

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  • Catalyst for preparing low-carbon olefin from synthesis gas and preparation method thereof
  • Catalyst for preparing low-carbon olefin from synthesis gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Catalyst preparation:

[0052] Take 1mol of Fe(NO 3 ) 3 9H 2 O was dissolved in water to make a 0.5mol / L Fe solution, and the solution was separated with 1350g 5wt% ammonia water for co-current precipitation, and washed three times with acetone to obtain fresh Fe(OH) 3 Precipitation I; dry the precipitate under reduced pressure at 100°C, and then roast at 500°C for 2 hours to obtain iron oxide powder; take 0.5mol of Ca(NO 3 ) 2 4H 2 O is dissolved in water to form a 40wt% Ca element solution; get 30% Al sol containing 0.5mol; mix and beat the above-mentioned Ca element solution, Al sol and iron oxide powder at 80°C; Concentration is 25wt% nitric acid to adjust the pH value of slurry to be 2, obtain slurry (solid content 40%); Slurry is spray-dried and molded, and spray machine inlet temperature is 320 ℃, and outlet temperature is 190 ℃; Then roasting, roasting The temperature is 600°C, the calcination time is 3h, and the catalyst particles for microspherical fl...

Embodiment 2

[0071] 1) Catalyst preparation:

[0072] Take 1mol of Fe(NO 3 ) 3 9H 2 O is dissolved in water and made into a 0.5mol / L Fe solution. The solution is co-currently precipitated with 1350g 5wt% ammonia water and separated, and washed with ethanol three times to obtain fresh Fe(OH) 3 Precipitation I; vacuum-dry the precipitate at 100°C, then roast at 600°C for 2h to obtain iron oxide powder; take 0.075mol of Mg(NO 3 ) 2 ·6H 2 O is dissolved in water to form a 40wt% Mg element solution; take 30% Al sol containing 2mol; mix and beat the above-mentioned Mg element solution, Al sol, and iron oxide powder at 80°C; The pH value of the slurry is adjusted to 1 for 25wt% nitric acid to obtain the slurry (solid content 40%); the slurry is spray-dried and molded, the sprayer inlet temperature is 320 ° C, and the outlet temperature is 190 ° C; then roasted, the roasting temperature 600°C, calcination time 3h, to obtain catalyst particles for microspherical fluidized bed, the composition...

Embodiment 3

[0091] 1) Catalyst preparation:

[0092] Take 1mol of Fe(NO 3 ) 3 9H 2 O was dissolved in water to make a 0.5mol / L Fe solution, and the solution was separated with 1350g 5wt% ammonia water for co-current precipitation, and washed three times with acetone to obtain fresh Fe(OH) 3 Precipitation I; dry the precipitate under reduced pressure at 100°C, and then roast at 500°C for 2 hours to obtain iron oxide powder; take 0.3mol of Ca(NO 3 ) 2 4H 2 O is dissolved in water to make a 40wt% Ca element solution; take 30% Al sol containing 1mol; mix and beat the above Ca element solution, Al sol, and iron oxide powder at 80°C; The pH value of 25wt% nitric acid adjustment slurry is 2, obtains slurry (solid content 40%); Slurry is spray-dried and molded, spray machine inlet temperature is 320 ℃, outlet temperature 190 ℃; Carry out roasting then, roasting temperature 600°C, calcination time 3h, to obtain catalyst particles for microspherical fluidized bed, the composition of which is:...

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Abstract

The invention discloses a catalyst for preparing low-carbon olefin from synthesis gas, and the catalyst comprises an iron element, an alkaline earth metal element, an aluminum element and an oxygen element, wherein the weight ratio of the alkaline earth metal to the iron element represented by X-ray photoelectron spectroscopy on the surface of the catalyst is (0.19-1.9):1; the weight ratio of the aluminum element to the iron element represented by X-ray photoelectron spectroscopy on the surface of the catalyst is (0.8-3.0):1. The molar ratio of the alkaline earth metal to the iron element in the catalyst is (0.075-0.75):1, and the weight ratio of the aluminum element to the iron element in the catalyst is (0.2-2):1. The catalyst provided by the invention has the advantages of fast reaction heat removal, difficult temperature runaway and high low-carbon olefin weight selectivity.

Description

technical field [0001] The invention relates to a catalyst for preparing low-carbon olefins from syngas and a preparation method thereof, belonging to the field of olefin preparation. Background technique [0002] Fischer-Tropsch (Fascher-Tropsch) synthesis refers to the process in which synthesis gas (mainly composed of CO and H2) directly synthesizes organic matter under the action of a catalyst. one of the routes. [0003] my country's energy is characterized by rich coal, less gas and less oil, and the environmental pollution caused by the direct combustion of coal has been paid more and more attention. The development of the process of converting coal / natural gas into petroleum products through synthesis gas can not only reduce the dependence on foreign countries for energy, but also has important significance for solving the environmental pollution caused by coal burning. [0004] Most of the Fischer-Tropsch catalysts reported in literature and patents in recent year...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J35/08C07C1/04
CPCB01J23/78B01J23/002C07C1/044B01J2523/00C07C2523/78B01J35/23B01J35/51B01J2523/23B01J2523/31B01J2523/842B01J2523/22Y02P20/52
Inventor 庞颖聪陶跃武李剑锋戴毅敏
Owner CHINA PETROLEUM & CHEM CORP
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