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Catalyst for one-step hydrogenation of carbon dioxide to prepare aromatic hydrocarbons, and preparation method and application thereof

A carbon dioxide and catalyst technology, applied in the field of coal chemical industry, can solve the problems of short life, complex phase structure, low Fischer-Tropsch activity, etc., and achieve the effects of small size, large specific surface area, and reduced selectivity

Active Publication Date: 2018-06-15
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the phase structure of iron-based catalysts is complex, the life is short, and the Fischer-Tropsch activity is low, resulting in high selectivity of the by-product CO. More importantly, the Fischer-Tropsch products are mainly chain hydrocarbons, and basically no aromatic products are formed. In addition, Although iron-based catalysts are effective against CO 2 The activity of methanation is much lower than that of cobalt-based catalysts, but there are still many by-product methane generated, and the methane selectivity is usually higher than 20%

Method used

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  • Catalyst for one-step hydrogenation of carbon dioxide to prepare aromatic hydrocarbons, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 96.96g Fe(NO 3 ) 3 9H 2 O and 51.52gZr(NO 3 ) 4 ·5H 2 O was added to 300mL deionized water to prepare a mixed metal salt solution with a concentration of 0.96mol / L, and 60g NaOH was added to 15L deionized water to prepare a 0.1mol / L precipitant solution. Add the precipitant solution dropwise to the metal salt solution at a temperature of 50°C. The dropping process needs to be carried out under ultrasonic vibration with a power of 160W, and the final pH value is kept at 10. After aging at 90°C for 3 hours, the resulting precipitate was washed three times with deionized water under ultrasonic vibration with a power of 80W, and the amount of water required for each washing was calculated as 50mL of deionized water per gram of filter cake. Then dry at 110°C for 15 hours, and then bake at 250°C for 8 hours to obtain metal oxides. Grind the metal oxide in an agate mortar for 0.5h, then press into tablets and sieve to obtain 40-60 mesh metal oxide particles (the molar ra...

Embodiment 2

[0050] 30.30g Fe(NO 3 ) 3 9H 2 O and 6.04gCu(NO 3 ) 2 ·3H 2 O was added to 1000mL deionized water to prepare a mixed metal salt solution with a concentration of 0.1mol / L, and 80g NaOH was added to 4L deionized water to prepare a 0.5mol / L precipitant solution. Add the precipitant solution dropwise to the metal salt solution at a temperature of 40°C. The dropping process needs to be carried out under ultrasonic vibration with a power of 200W, and the final pH value is kept at 8. After the precipitation reaction is completed, the obtained product is in the After aging at 70°C for 1 hour, the resulting precipitate was washed three times with deionized water under ultrasonic vibration at a power of 40W, and the amount of water required for each washing was calculated as 60mL of deionized water per gram of filter cake. Then dry at 80°C for 6h, and then bake at 500°C for 5h to obtain metal oxide (the molar ratio of Fe and Cu is 3:1). Grinding the metal oxide in an agate mortar ...

Embodiment 3

[0053] 96.96g Fe(NO 3 ) 3 9H 2 O and 17.84gZn(NO 3 ) 2 ·6H 2 O was added to 300mL deionized water to prepare a mixed metal salt solution with a concentration of 1.00mol / L, and 80g NaOH was added to 2L deionized water to prepare a 1.0mol / L precipitant solution. Add the precipitant solution dropwise to the metal salt solution at a temperature of 70°C. The dropping process needs to be carried out under ultrasonic vibration with a power of 100W, and the final pH value is kept at 9. After aging for 0.5 h at ℃, the resulting precipitation was washed 8 times with deionized water under ultrasonic vibration with a power of 90 W, and the amount of water required for each washing was calculated as 20 mL of deionized water per gram of filter cake. Then dry at 100°C for 20h, and then bake at 600°C for 4h to obtain metal oxide (the molar ratio of Fe and Zn is 4:1). Grinding the metal oxide in an agate mortar for 0.6h, then pressing into tablets and sieving to obtain 60-80 mesh metal o...

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Abstract

The invention provides a catalyst for one-step hydrogenation of carbon dioxide to prepare aromatic hydrocarbons, and a preparation method and an application thereof. The catalyst comprises, by mass, 10-90% of nano-metal oxide and 10-90% of a ZSM-5 molecular sieve. The catalyst obtained in the invention has the advantages of excellent catalysis performance, good reaction stability and high target product selectivity; and the highest selectivity of C5+ in hydrocarbon products reaches 80% or more, and the highest selectivity of aromatic hydrocarbons reaches 75%.

Description

technical field [0001] The invention relates to the field of coal chemical industry and the field of greenhouse gas emission reduction and utilization, in particular to a catalyst for one-step hydrogenation of carbon dioxide to prepare aromatics, a preparation method and application thereof. Background technique [0002] carbon dioxide (CO 2 ) as a "carbon source" compound that exists in abundance in nature, converting it into valuable chemicals or fuels can not only solve the problem of excessive CO 2 Environmental problems caused by emissions, and can alleviate the problem of excessive dependence on fossil fuels. The use of hydrogen produced by new energy sources for CO 2 Hydroconversion can convert CO 2 Conversion into products such as chemicals (methanol, formic acid and dimethyl ether, etc.), synthesis gas, materials and liquid fuels. Among the many products, aromatics, as an important fuel additive and organic chemical raw material, are currently mainly produced th...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J29/48C10G50/00
CPCB01J29/46B01J29/48B01J2229/20C10G50/00
Inventor 高鹏崔勖杨海艳党闪闪杨承广卜宪昵王慧魏伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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