Catalyst for synthesizing methanol through CO2 hydrogenation as well as preparation method and application

A technology for synthesizing methanol and carbon dioxide, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of hydroxyl compounds, etc., can solve the problem of low conversion rate, poor methanol selectivity, low methanol yield, etc. problem, to achieve the effect of good activity, stable performance and large quantity

Active Publication Date: 2014-04-16
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

Researchers modified Cu-based catalysts by adding elements such as Zn, Al, Zr, Mg, Mn, Cr, La, B, In, Ga, Gd, Ce, Y, Ti, Ag, Fe, and V, or by using Different catalyst preparation methods such as gel method, co-precipitation method and azeotropic distillation method, or the use of microwave and ultrasonic treatment to change the texture and performance of the catalyst, thereby improving the activity of the catalyst, but there are still CO 2 Low conversion rate (20%-25%), poor methanol selectivity (about 55%) and low methanol yield

Method used

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  • Catalyst for synthesizing methanol through CO2 hydrogenation as well as preparation method and application
  • Catalyst for synthesizing methanol through CO2 hydrogenation as well as preparation method and application
  • Catalyst for synthesizing methanol through CO2 hydrogenation as well as preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1. Zr is in the form of zirconyl nitrate, and all the other metal elements (Cu, Zn, Al) are dissolved in deionized water in the form of nitrate, and a mixed solution is prepared by Cu2Zn1Al0.7Zr0.3 metal atom molar ratio; at 20 Co-precipitate with a mixed solution of sodium hydroxide and sodium carbonate at ℃, the precipitation process needs to be fully stirred, keep pH = 10, age at 60 ℃ for 15 h, the precipitate is washed with deionized water until no sodium ions are detected, at 80 ℃ Dry and bake at 500°C. Then the calcined metal oxides were immersed in sodium fluoride aqueous solution (0.2 mol L –1 ), and at N 2 Stir under protection for 48 h. The resulting precipitate was filtered, CO removed 2 Multiple washes with deionized DD water (until Na-free + filter out), and at N 2 Dry at 80°C under protection, then in N 2 Calcined at 500 °C for 4 h under air protection. Broken to 40-60 mesh. The catalyst element modified by halogen can be expressed as Cu...

Embodiment 2

[0025] Example 2. Metal elements (Cu, Zn, Al, Y) are all dissolved in deionized water in the form of nitrate, and a mixed solution is prepared according to the molar ratio of Cu2Zn1Al0.9Y0.1 metal atoms; mixed with sodium hydroxide and sodium carbonate at 20 ° C The solution was co-precipitated, and the precipitation process required sufficient stirring to maintain pH = 8, aged at 60 °C for 15 h, the precipitate was washed with deionized water until no sodium ions were detected, dried at 80 °C and calcined at 500 °C. The calcined metal oxides were immersed in aqueous sodium fluoride (0.4 mol L –1 ), and at N 2 Stir under protection for 48 h. The resulting precipitate was filtered, CO removed 2 Multiple washes with deionized DD water (until Na-free + filter out), and at N 2 Dry at 80°C under protection, then in N 2 Calcined at 450 °C for 4 h under protection. Broken to 40-60 mesh. The halogen-modified catalyst elements can be expressed as Cu2Zn1Al0.9Y0.1F0.1 in atomic...

Embodiment 3

[0027]Example 3. Zr is in the form of zirconyl nitrate, the rest of the metal elements (Cu, Zn, Al) are in the form of nitrate, and the halogen fluorine is in the form of sodium fluoroaluminate, according to the atomic molar ratio of Cu2Zn1Al0.7Zr0.3F0.6 Prepare a mixed solution; co-precipitate with a mixed solution of sodium hydroxide and sodium carbonate at 20°C, fully stir during the precipitation process, keep pH = 10, age at 60°C for 15 hours, wash the precipitate with deionized water until no sodium ions are detected Drying at 80°C and firing at 500°C. The hydrogenation reaction of carbon dioxide was carried out in a stainless steel reactor with an inner diameter of 6 mm. After reduction with pure hydrogen at 350 °C for 10 h, it was cooled to room temperature and switched to reaction gas for reaction. The reaction conditions were as follows: P=5.0 MPa, T=270 °C, GHSV= 9000 mL gcat -1 h -1 , H 2 / CO 2 Molar ratio = 3, the liquid phase product was collected in an ice...

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Abstract

The invention discloses a catalyst for synthesizing methanol through CO2 hydrogenation, comprising Cu, Zn, Al, X, halogen and oxygen elements, oxides and halides, wherein the molar ratio of [Cu+Zn+MA] to [Al+Mb] is 2-18; the molar ratio of Cu to Zn is 0.5-5; the molar ratio of MA to [Cu+Zn] is 0-5; the molar ratio of MB to Al is 0-9; the molar ratio of halogen to Al is 0.05-5; MA and MB cannot be 0 at the same time; MA represents a mono-valent or divalent metal ion in X; MB represents a trivalent and/or tetravalent metal ion in X; X is one or a combination of more elements of Li, K, Mg, B, Ga, In, transition metal elements and rare-earth metal elements. The catalyst has the advantages of high carbon dioxide conversion rate, good methanol selectivity and high methanol yield.

Description

technical field [0001] The invention belongs to a catalyst and its preparation method and application, in particular to a carbon dioxide hydrogenation methanol catalyst, its preparation method and application. Background technique [0002] Reasonable and effective use of the greenhouse gas carbon dioxide can not only solve the environmental problems faced by human beings, but also create huge economic value. In view of the fact that methanol is not only an important raw material for the chemical industry and petrochemical industry, but also a clean fuel, CO 2 The process of hydrogenation to methanol has received extensive attention. However, CO 2 Very stable, activation is difficult, so catalyst development for this process is key. [0003] Due to the advantages of high activity at low pressure and good comprehensive performance, copper-based catalysts have become the most studied catalyst system. Researchers modified Cu-based catalysts by adding elements such as Zn, Al,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01J27/138B01J23/889C07C31/04C07C29/154
CPCY02P20/52
Inventor 赵宁李枫肖福魁王峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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