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Catalyst used for preparing low-carbon olefin from synthetic gas and application of catalyst

A technology of low-carbon olefins and catalysts, applied in the field of catalysts for producing low-carbon olefins from synthesis gas, can solve the problems of reduced number of effective active sites, low selectivity of low-carbon olefins, small particle size dispersion, etc., and achieve a simple and easy preparation method control, high conversion rate and low carbon olefin selectivity, and the effect of oxygen-containing group improvement

Inactive Publication Date: 2018-04-20
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a catalyst for producing low-carbon olefins from syngas and its application. The prepared catalyst has higher dispersion and smaller particle size, and has higher activity and low-carbon olefin selectivity , good stability, and still maintain high reactivity after 100 hours of reaction, which solves the problem that the metal active particles in traditional carbon-supported iron-based catalysts are prone to migration and polymerization under high temperature and high pressure reaction conditions, resulting in a decrease in the number of effective active sites and side effects. There are many products, and the selectivity of low-carbon olefins is low

Method used

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  • Catalyst used for preparing low-carbon olefin from synthetic gas and application of catalyst
  • Catalyst used for preparing low-carbon olefin from synthetic gas and application of catalyst
  • Catalyst used for preparing low-carbon olefin from synthetic gas and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0027] Include the following steps:

[0028] 1. Boil an appropriate amount of activated carbon with deionized water and wash it with water to remove ash and impurities in the activated carbon, then disperse it in a 10wt% nitric acid solution, reflux it in an oil bath at 80°C for 5 hours, and then wash it with deionized water until the filtrate pH=7, to remove residual metal ions in the activated carbon, the filter cake was placed in an oven at 60°C and dried overnight; 3 g of activated carbon washed with water and acid washed were dispersed into an aqueous potassium permanganate solution with a concentration of 0.1 mol / L, Control the mass ratio of potassium permanganate to activated carbon between 0.2-1.1, stir magnetically at 70°C for 30 minutes, then filter and wash with deionized water until the filtrate is colorless, and dry overnight in an oven at 120°C to obtain the pre- Treated activated carbon carrier;

[0029] 2. Prepare an aqueous ferric nitrate solution with a load...

Embodiment 2

[0033] With reference to Example 1, the difference is that the concentration of potassium permanganate aqueous solution in step 1 is 0.05mol / L, and the catalyst obtained is denoted as Fe-5MnK-AC; Others are the same as in Example 1.

[0034] After the reaction is stable, the gas obtained from the reaction is directly passed into gas chromatography (FID, TCD) to detect and analyze its components on-line, and the liquid components (water phase and oil phase) obtained from the reaction are collected by cold traps connected to the fixed bed , The liquid components were taken out and weighed every 24 hours, wherein the hydrocarbon content in the water phase product was extremely low and negligible, and the oil phase product was analyzed by off-line gas chromatography. The main components of gas-phase hydrocarbon products are alkanes and olefins below C5, and the main components of oil-phase hydrocarbon products are long-chain alkanes and olefins above C5 and their isomers, alcohols ...

Embodiment 3

[0036] With reference to Example 1, the difference is that the concentration of potassium permanganate aqueous solution in step 1 is 0.02mol / L, and the catalyst obtained is denoted as Fe-2MnK-AC; Others are the same as in Example 1.

[0037] After the reaction is stable, the gas obtained from the reaction is directly passed into gas chromatography (FID, TCD) to detect and analyze its components on-line, and the liquid components (water phase and oil phase) obtained from the reaction are collected by cold traps connected to the fixed bed , The liquid components were taken out and weighed every 24 hours, wherein the hydrocarbon content in the water phase product was extremely low and negligible, and the oil phase product was analyzed by off-line gas chromatography. The main components of gas-phase hydrocarbon products are alkanes and olefins below C5, and the main components of oil-phase hydrocarbon products are long-chain alkanes and olefins above C5 and their isomers, alcohols ...

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Abstract

The invention discloses a catalyst used for preparing low-carbon olefin from synthetic gas. The catalyst takes active carbon as a carrier, and adopts iron as an active metal component and potassium and manganese as auxiliary agents, wherein the load capacity of iron is 5-20 wt%, the load capacity of potassium is 2-5 wt%, and the load capacity of manganese is 10-30 wt%. The prepared catalyst is relatively high in dispersiveness and relatively small in particle size, has high activity and low-carbon olefin selectivity, and is good in stability. The catalyst can still maintain relatively high reaction activity after the reaction has been finished for 100 h. The problem that metal active particles are easy to undergo transfer polymerization in a high-temperature high-pressure reaction condition, which results in small quantity of efficient active sites, more by-products and relatively low selectivity to low-carbon olefin, in a traditional carbon-loaded iron-based catalyst, is solved. The catalyst has bright industrial application prospects.

Description

Technical field: [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for producing low-carbon olefins from synthesis gas and its application. Background technique: [0002] Low-carbon olefins such as ethylene, propylene, and butene are important chemical raw materials in petrochemical energy, important platform molecules for the synthesis of polymer compounds such as plastics, rubber, and artificial fibers, and are also the most produced chemicals in the world. Ethylene is the basic chemical raw material for synthetic fibers, synthetic rubber, synthetic plastics (polyethylene and polyvinyl chloride), synthetic ethanol (alcohol), and is also used to manufacture vinyl chloride, styrene, ethylene oxide, acetic acid, acetaldehyde, and ethanol And explosives, etc., and further can be made into pipes, film products, packaging bags, cosmetics, high-poly fibers and other products, which are closely related to our daily life. As a major petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/02C07C1/04C07C9/04C07C11/02C10G2/00
CPCC10G2/332C07C1/044B01J23/8892B01J37/0207C10G2300/70C10G2400/20B01J35/393C07C9/04C07C11/02
Inventor 王晨光田志鹏马隆龙陈伦刚徐莹张兴华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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