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A Cu-Zn-based catalyst for reverse water gas shift reaction, its preparation method and application

A technology for shift reaction and reverse water gas, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. The preparation method and application patent report of the shift reaction catalyst have achieved the effect of good industrial application prospects, low requirements for reaction equipment and stable performance

Active Publication Date: 2016-06-08
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As far as patents are concerned, there are currently only two reports on the method of adjusting the CO content in the synthesis gas by using the reverse water gas shift reaction. 200980150470.3) and Chengdu Hengxinwei Petrochemical Technology Co., Ltd. applied for a patent "a method and process for optimizing synthesis gas components using reverse water gas shift technology" (application number: 200610020836.3), but there is no patent for reverse water gas shift reaction catalysts Related patent reports on preparation methods and applications

Method used

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  • A Cu-Zn-based catalyst for reverse water gas shift reaction, its preparation method and application
  • A Cu-Zn-based catalyst for reverse water gas shift reaction, its preparation method and application
  • A Cu-Zn-based catalyst for reverse water gas shift reaction, its preparation method and application

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Embodiment 1

[0039] 1. Catalyst Cu 46.5 Zn 46.5 K 7 preparation of

[0040] 1) Prepare 0.5mol / L Cu and Zn nitrate aqueous solutions respectively, and mix them according to the mole fraction ratio of Cu and Zn in the catalyst; mix the above mixed aqueous solution with the prepared 0.5mol / L Na 2 CO 3 Aqueous solution, under the action of continuous stirring at 70 ℃, add dropwise to carry out co-precipitation; maintain the pH of the precipitation slurry = 8.0, after the precipitation is completed, raise the temperature to 80 ℃, continue to stir for 30 minutes; then wash at room temperature for 1 hour Filter to free of Na + , to obtain a Cu-Zn-based carrier;

[0041] 2) Using the equal volume impregnation method, configure 0.5mol / L K 2 CO 3 Aqueous solution, according to the ratio of the above expression (Cu 46.5 Zn 46.5 K 7 ), using the solution to impregnate the Cu-Zn-based carrier obtained in step 1) for 8h to obtain a catalyst precursor;

[0042] 3) Put the obtained catalyst pre...

Embodiment 2

[0051] Reference Example 1 Catalyst Cu 46.5 Zn 46.5 K 7 Preparation, by the expression Cu 50 Zn 40 Na 7 Mg 3 Prepare the catalyst, configure the acetates of Cu and Zn into 1.5mol / L aqueous solutions respectively, and mix them, and mix the above-mentioned mixed aqueous solutions with the configured 1.5mol / L Na 2 CO 3 The aqueous solution was added dropwise to carry out co-precipitation, and the mixed aqueous solution of the nitrate configuration of 1.0mol / LNa and Mg was used to replace the 0.5mol / L K 2 CO 3 aqueous solution.

[0052] In Cu 50 Zn 40 Na 7 Mg 3 Catalyst is applied in reverse water gas shift reaction process, and catalyst loading and reduction activation condition are identical with embodiment 1; Reaction condition is: H 2 / CO 2 The molar ratio is 3, 340°C, 1-10MPa, volume space velocity 5000h -1 Catalyst evaluation was carried out below, and the obtained results are shown in Table 2.

[0053] Table 2

[0054]

Embodiment 3

[0056] Reference Example 1 Catalyst Cu 46.5 Zn 46.5 K 7 Preparation, by the expression Cu 60 Zn 30 K 10To prepare the catalyst, configure the nitrates of Cu and Zn into 3.0mol / L aqueous solutions respectively, and mix them, and add the above-mentioned mixed aqueous solution and the configured 3.0mol / L KOH aqueous solution in parallel for co-precipitation; 2.0mol / L of KNO was used in the impregnation preparation process of the catalyst 3 Aqueous solution replaces the K of 0.5mol / L among the embodiment 1 2 CO 3 aqueous solution.

[0057] In Cu 60 Zn 30 K 10 The catalyst is used in the reverse water gas shift reaction process, and the catalyst loading is the same as that in Example 1; the catalyst is reduced and activated except that 10% H 2 / N 2 The mixed gas is except reducing gas, and other is identical with embodiment 1; Reaction condition is: H 2 / CO 2 The molar ratio is 3, 340°C, 5MPa, and the volume space velocity is 1000~10000h -1 Catalyst evaluation was ca...

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Abstract

The invention discloses a Cu-Zn-based catalyst used in a reverse water gas shift reaction for catalyzing CO2 hydrogenation conversion for producing CO, and a preparation method thereof and an application thereof. The Cu-Zn-based catalyst has a structural formula of CuaZnbMc. M is one or a combination of more than one selected from transition metal elements, alkali metal, alkaline earth metal or rare earth; a, b, and c are respectively molar fractions of Cu, Zn, and M; a is in the range of 40-60%, b is in the range of 30-60%, and c is in the range of 0-10%. The Cu-Zn-based catalyst provided by the invention has the advantages of low cost, simple preparation method, stable performance, and suitability for industrial large-scale production. Under low temperature, the catalyst has high reaction activity and high CO selectivity, and can be used in the reverse water gas shift reaction for synthesizing CO, such that CO2 emission rate can be reduced. The catalyst can also be used in coupling with a CO hydrogenation catalyst, such that products such as hydrocarbons low-carbon alcohols and high-carbon alcohols with high added values can be produced. The catalyst has good industrial application prospect.

Description

Technical field: [0001] The invention relates to a catalyst, its preparation method and application, in particular to a Cu-Zn-based catalyst for reverse water gas shift reaction, its preparation method and application. Background technique: [0002] carbon dioxide (CO 2 ) is one of the main greenhouse gases, CO produced by human activities (mainly the burning of fossil fuels) over the past few centuries 2 Emissions have made atmospheric CO 2 The concentration rose from 280ppm before the industrial revolution to 390ppm in 2010, and experts predict that it will reach 570ppm by the end of this century. CO 2 Growth in emissions will lead to irreversible global warming. To this end, countries and researchers around the world are trying to reduce CO 2 emissions. On December 7, 2009, at the fifteenth meeting of the parties to the United Nations Framework Convention on Climate Change held in Copenhagen, the capital of Denmark, the Chinese government proposed that by 2020, CO p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J23/887B01J23/86B01J23/889B01J23/83C01B31/18C01B32/40
Inventor 陈新德李尚贵郭海军张海荣熊莲
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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