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Catalyst for preparing low-carbon olefin through carbon dioxide hydrogenation

A technology for low-carbon olefins and carbon dioxide, which is applied in the directions of physical/chemical process catalysts, preparation of liquid hydrocarbon mixtures, and treatment of hydrocarbon oils, etc., can solve the problem of high methane selectivity, achieve simple preparation methods, simple surface treatment methods, and promote products. the effect of diffusion

Pending Publication Date: 2021-06-15
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Impregnation of alkali metals on the surface of carbon nitride can form an active phase iron nitride complex for Fischer-Tropsch synthesis. Although it has high olefin selectivity, it has a strong interaction with the support, resulting in high methane selectivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 8.8g of lanthanum nitrate, 15.3g of ferric nitrate and 10.5g of manganese nitrate, dissolve them in distilled water, then add 23.28g of citric acid, after dissolving in distilled water, mechanically stir in a water bath with a water bath temperature of 80°C and a stirring speed of 500r / min. After stirring to a gel state, dry at 100°C for 12 hours. Grind 5g of the dried powder and 10g of melamine thoroughly, put it into a muffle furnace, and bake it for 4h at a temperature of 750°C and a heating rate of 2.5°C / min. After cooling to room temperature, powder A is obtained through thorough grinding. Take 6 g of powder A in a beaker, add 200 mL of 1 mol / L hydrogen peroxide, stir magnetically for 2 h, and then filter and dry to obtain powder B. Take 3 g of powder B and place it in a reaction kettle, add 250 mL of ammonia water with a mass fraction of 2.5 wt%, stir it magnetically for 2 h, put it in an oven, react at 150 °C for 3 h, and then take it out and dry it by suct...

Embodiment 2

[0023] Weigh 8.8g of lanthanum nitrate and 10.5g of manganese nitrate, dissolve them in distilled water, then add 23.28g of citric acid, after dissolving in distilled water, mechanically stir in a water bath, the temperature of the water bath is 80°C, and the stirring speed is 500r / min. After stirring to gel state, dry at 100°C for 12h. Fully grind the dried powder with an equal mass of melamine, roast for 4 hours at a temperature of 600°C and a heating rate of 5°C / min, cool to room temperature, and grind thoroughly to obtain powder A. Take 5 g of powder A in a beaker, add 50 mL of 2 mol / L hydrogen peroxide, stir magnetically for 2 hours, and then filter and dry to obtain powder B. Take 3 g of powder B in a reaction kettle, add 100 mL of ammonia water with a mass fraction of 3 wt%, magnetically stir it for 2 h, put it in an oven, react at 180 °C for 3 h, take it out and dry it with suction to obtain powder C; Take 0.5 g of powder B and 2 g of powder C, and mix them mechanical...

Embodiment 3

[0025]Weigh 5.29g of strontium nitrate, 7.27g of cobalt nitrate, and 10.1g of ferric nitrate, dissolve them in distilled water, then add 19.21g of citric acid, after dissolving in distilled water, mechanically stir in a water bath with a water bath temperature of 80°C and a stirring speed of 500r / min. After stirring to a gel state, dry at 100°C for 12 hours. Grind the dried powder with an equal mass of melamine fully, put it into a muffle furnace, and roast it for 6 hours at a temperature of 700°C with a heating rate of 2°C / min. After cooling down to room temperature, it is fully ground to obtain powder A. Take 5 g of powder A in a beaker, add 100 mL of 5 mol / L hydrogen peroxide, stir for 3 hours, and then filter and dry to obtain powder B. Take 5 g of powder B and place it in a reaction kettle, add 50 mL of ammonia water with a mass fraction of 20 wt%, stir it magnetically for 2 h, put it in an oven, react at 200 °C for 5 h, and then take it out and dry it with suction to obt...

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PUM

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Abstract

The invention relates to a catalyst for preparing low-carbon olefin through carbon dioxide hydrogenation, belongs to the technical field of composite materials, and particularly relates to preparation and application of a perovskite-graphite phase carbon nitride composite material. After the composite material is subjected to surface processing, a large number of hydroxyl groups and amino groups exist on the periphery of the structure, and strong interaction can be generated between the composite material and perovskite metal. The catalyst has a unique electronic structure and good chemical stability, the olefin selectivity is improved through interaction between the surface-modified carbon nitride and perovskite iron oxide, and the surface-modified carbon nitride provides a reliable scheme for preparing olefin through hydrogenation reaction.

Description

technical field [0001] The invention relates to a catalyst for hydrogenation of low-carbon olefins and its preparation method and application, in particular to the preparation of perovskite and graphite phase carbon nitride and multifunctional functional group composite materials and its CO or CO 2 Application of hydrogenation to olefins. Background technique [0002] In the tense situation of world petroleum energy, it is of great strategic significance to vigorously develop the production of olefins from synthesis gas. CO or CO 2 Hydrogenation to prepare low-carbon olefins has the advantages of short process and low energy consumption. However, the F-T product is limited by the Anderson-Schulz-Flory (A-S-F) distribution, which has the problems of wide product distribution and low yield of total olefins. Therefore, it is of great significance to study and develop catalysts for directional conversion of target products. [0003] Graphite phase carbon nitride has a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C10G2/00
CPCB01J27/24C10G2/50C10G2/33C10G2/332C10G2400/20Y02P30/40
Inventor 马利海张建利郭庆杰孙修楠张玉玺张建红刘志昊
Owner NINGXIA UNIVERSITY
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