Catalyst for synthesising methanol by hydrogenation of carbon dioxide as well as preparation method and application thereof

A technology for synthesizing methanol and carbon dioxide, applied in the direction of metal/metal oxide/metal hydroxide catalysts, preparation of hydroxyl compounds, preparation of organic compounds, etc., to achieve good performance repeatability, improve conversion rate and selectivity, and simple preparation method Effect

Active Publication Date: 2013-08-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the application of perovskite-like copper-based catalysts in the hydrogenation of carbon dioxide to methanol

Method used

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  • Catalyst for synthesising methanol by hydrogenation of carbon dioxide as well as preparation method and application thereof
  • Catalyst for synthesising methanol by hydrogenation of carbon dioxide as well as preparation method and application thereof
  • Catalyst for synthesising methanol by hydrogenation of carbon dioxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: take following metal nitrate as precursor, prepare mixed solution, its metal atom molar ratio is La10Cu7Zn3, citric acid molar weight is 2 times of metal element total amount. Stir to remove water at 80°C, raise the temperature to 120°C after it becomes gelatinous, further dehydrate to form a gel, and ignite. The burned powder was then calcined at 1000°C for 4 hours to obtain the composition La 10 Cu 7 Zn 3 o x catalyst. Sieve the calcined catalyst tablet and crush it to 40-60 mesh for reaction evaluation.

[0018] CO 2 +H 2 The reaction was carried out in a fixed-bed reactor. Before the reaction, the catalyst was reduced with high-purity hydrogen at 330°C for 6 hours, and then switched to CO 2 +H 2 The mixed gas was reacted, and the reaction conditions were as follows: P=5.0 MPa, T=250 ℃, GHSV=3600 h -1 , n(H 2 ) / n(CO 2 ) molar ratio=3, the liquid phase product was collected in an ice-water bath, and the product composition was analyzed by gas ...

Embodiment 2

[0020] Example 2: Use the following metal nitrates as precursors to prepare a mixed solution, the molar ratio of metal atoms is La4Y2Cr2Cu6Zn3, and the molar weight of citric acid is 1.5 times the total amount of metal elements. Stir at 60°C to remove water, raise the temperature to 150°C after it becomes gelatinous, further dehydrate to form a gel, and ignite. The burned powder is then calcined at 800°C for 4 hours to obtain the composition La 4 Y 2 Cr 2 Cu 6 Zn 3 o x catalyst. The calcined catalyst was pressed into tablets and sieved, crushed to 40-60 mesh for reaction evaluation.

[0021] Reaction conditions: P=2.0 MPa, T=230 ℃, GHSV=2000 h -1 , n(H 2 ) / n(CO 2 ) molar ratio=2, the obtained results are as follows:

[0022]

Embodiment 3

[0023] Example 3: Using the following metal nitrates as precursors, a mixed solution was prepared, the molar ratio of metal atoms was La3Ce2Cu7Zn3, and the molar amount of citric acid was 1.2 times the total amount of metal elements. Stir to remove water at 80°C, raise the temperature to 170°C after it becomes gelatinous, further dehydrate to form a gel, and ignite. The burned powder is then calcined at 500°C for 8 hours to obtain the composition La 3 Ce 2 Cu 7 Zn 3 o x catalyst. The calcined catalyst was pressed into tablets and sieved, crushed to 40-60 mesh for reaction evaluation.

[0024] Reaction conditions P=6.0 MPa, T=350 ℃, GHSV=5000 h -1 , n(H 2 ) / n(CO 2 ) molar ratio=4, the obtained results are as follows:

[0025]

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PUM

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Abstract

The invention discloses a catalyst for synthesising methanol by hydrogenation of carbon dioxide. The catalyst is composed of oxides with the following molar ratio based on metal: 20-50% of La, 0-10% of M, 15-35% of Cu, and 2-15% of Zn, wherein M is one or more of Zr, Y, K, Ag, Ce, Pd, Mn, Mg, Fe, Co, Ni or Cr. The catalyst disclosed by the invention has the advantages that preparation is simple, operation is easy, catalyst performance repeatability is good, industrial amplification is easy to realize, and reaction conversion rate and reaction selectivity are high.

Description

technical field [0001] The invention belongs to a carbon dioxide hydrogenation synthesis methanol catalyst, preparation method and application. Background technique [0002] Carbon dioxide is a "greenhouse gas" that originates primarily from the burning of fossil fuels and human activities. The continuous increase of carbon dioxide content in the atmosphere leads to global warming and threatens the survival of human beings. Therefore, reducing the content of carbon dioxide in the atmosphere and promoting "energy saving and emission reduction" have become the focus of people's increasing attention. Reasonable and effective use of carbon dioxide can not only solve the temperature rise problem faced by human beings, but also create huge economic value. Hydrogenation of carbon dioxide to methanol is a route for rational utilization of carbon dioxide, and its product methanol is an important platform chemical and clean energy. However, CO 2 Very stable and difficult to activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/86C07C31/04C07C29/154
CPCY02P20/52
Inventor 赵宁詹海鹃肖福魁李枫王峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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