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Preparation method of catalyst for preparing low-carbon olefin from synthesis gas

A low-carbon olefin and catalyst technology, applied in the field of olefin preparation, can solve the problems of easy overheating, difficulty in removing heat from the reaction, and easy deactivation of the catalyst

Pending 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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  • Preparation method of catalyst for preparing low-carbon olefin from synthesis gas
  • Preparation method of catalyst for preparing low-carbon olefin from synthesis gas
  • Preparation method of catalyst for preparing low-carbon olefin from synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Catalyst preparation:

[0035] Take 1mol of Fe(NO 3 ) 3 9H 2 Dissolve O in water to make a 0.5mol / L Fe element solution; take 0.1mol of Cu(NO 3 ) 2 ·6H 2 O is dissolved in water to make a 0.5mol / L Cu element solution; 0.05mol RbNO 3 Dissolve in water to form a 30wt% Rb element solution; mix the above three solutions together to form solution I; take 3mol of nano-TiO 2Add to the above solution I and stir to obtain slurry II; heat slurry II to 80°C in a water bath at 80°C, adjust the pH value of the slurry to 5 with ammonia water with a concentration of 25wt%, to obtain slurry III, adjust the slurry The solid content of the material reaches 35%, and the slurry IV is obtained; the slurry IV is spray-dried and molded, the inlet temperature of the sprayer is 320°C, and the outlet temperature is 190°C; then roasted, the roasting temperature is 600°C, and the roasting time is 3h, and the catalyst particles are obtained. , and its composition is: Fe 100 Cu 10 Rb 5 ...

Embodiment 2

[0052] 1) Catalyst preparation:

[0053] Take 1mol of Fe(NO 3 ) 3 9H 2 Dissolve O in water to make a 0.5mol / L Fe element solution; take 0.1mol of Cu(NO 3 ) 2 ·6H 2 O is dissolved in water to make a 0.5mol / L Cu element solution; 0.05mol KNO 3 Dissolve in water to make 30wt% K element solution; mix the above three solutions together to make solution I; take 3mol of nano-ZrO 2 Add to the above solution I and stir to obtain slurry II; heat slurry II to 80°C in a water bath at 80°C, adjust the pH value of the slurry to 4 with ammonia water with a concentration of 25wt%, to obtain slurry III, adjust the slurry The solid content of the material reaches 35% to obtain slurry IV; the slurry IV is spray-dried and formed, the inlet temperature of the sprayer is 300°C, and the outlet temperature is 170°C; then roasted at a roasting temperature of 550°C for 2 hours to obtain catalyst particles , and its composition is: Fe 100 Cu 10 K 5 Zr 300 o x .

[0054] 2) Catalyst evaluati...

Embodiment 3

[0070] 1) Catalyst preparation:

[0071] Take 1mol of Fe(NO 3 ) 3 9H 2 Dissolve O in water to make a 0.5mol / L Fe element solution; take 0.1mol of Cu(NO 3 ) 2 ·6H 2 O is dissolved in water to make a 0.5mol / L Cu element solution; 0.05mol NaNO 3 Dissolve in water to form a 30wt% Rb element solution; mix the above three solutions together to form solution I; take 3mol of nano-TiO 2 Add to the above solution I and stir to obtain slurry II; heat slurry II to 80°C in a water bath at 80°C, adjust the pH value of the slurry to 5 with ammonia water with a concentration of 25wt%, to obtain slurry III, adjust the slurry The solid content of the material reaches 35%, and the slurry IV is obtained; the slurry IV is spray-dried and molded, the inlet temperature of the sprayer is 320°C, and the outlet temperature is 190°C; then roasted, the roasting temperature is 600°C, and the roasting time is 3h, and the catalyst particles are obtained. , and its composition is: Fe 100 Cu 10 Na 5...

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Abstract

The invention discloses a preparation method of a catalyst for preparing low-carbon olefin from synthesis gas. The preparation method comprises the following steps of: S1, preparing a mixed aqueous solution I of an iron salt, a copper salt and an alkali metal salt; S2, adding a carrier oxide into the solution I, and performing mixing to obtain a mixture II; S3, adjusting the pH value of a mixture III to 1-5 to obtain a slurry IV; and S4, carrying out spray drying treatment on the slurry IV, and then performing roasting to obtain the catalyst. Active components of the catalyst prepared by the method comprise a composition represented by the following formula: Fe100CuaBbCcOx, wherein B is selected from alkali metal elements; C is selected from titanium and / or zirconium; the value range of a is 1.0-20.0; the value range of b is 1.0-10.0; the value range of c is 50.0-500.0; and x is the total number of oxygen atoms required for satisfying the valence of each element in the formula. The catalyst provided by the invention has the advantages of fast reaction heat removal, difficult temperature runaway and high light olefin weight selectivity.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for preparing low-carbon olefins from syngas and a catalyst prepared by the method, belonging to the field of olefin preparation. Background technique [0002] There are direct method and indirect method for preparing light olefins from syngas. The so-called direct method generally refers to high-temperature Fischer-Tropsch synthesis under specific conditions. Fischer-Tropsch (Fascher-Tropsch) synthesis is the process of synthesizing hydrocarbons by using synthesis gas (mainly composed of CO and H2) under the action of a catalyst. It 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. Since the 1990s, oil resources have become increasingl...

Claims

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Application Information

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IPC IPC(8): B01J23/78C10G2/00C07C1/04C07C9/04
CPCB01J23/78B01J23/002C10G2/332C07C1/044B01J2523/00C07C2523/78B01J2523/14B01J2523/17B01J2523/47B01J2523/842B01J2523/13B01J2523/48B01J2523/12C07C9/04
Inventor 庞颖聪陶跃武李剑锋
Owner CHINA PETROLEUM & CHEM CORP
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