Catalyst for preparing methanol by carbon dioxide hydrogenation and preparation method thereof

A carbon dioxide and catalyst technology, which is applied in the field of catalysts and preparations for hydrogenation of carbon dioxide to methanol, can solve the problems of many by-products, low conversion rate, and low methanol selectivity, and achieve low cost, high stability, and simple preparation method Effect

Active Publication Date: 2019-05-24
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Due to CO 2 The inertness and thermodynamic unfavorable factors make it difficult to activate and reduce carbon dioxide. The catalysts prepared by traditional methods such as impregnation and co-precipitation have shortcomings such as low conversion rate, m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: Weigh 15.00 g of melamine, place it in a muffle furnace, set parameters, room temperature is 20°C, heating rate is 2°C / min, heating time is 265min, constant temperature is 240min at 550°C, cooling rate is 80°C / h. get pale yellow C 3 N 4 powder.

[0043] Step 2: Weigh 1.93 g Cu(NO 3 ) 2 ·3H 2 O, 2.38 g Zn(NO 3 ) 2 ·6H 2 O, dissolved in 300ml deionized water to obtain a clear and transparent blue solution.

[0044] Step 3: Uniformly disperse the surfactant CTAB in the Cu and Zn solutions under the condition of continuous stirring. Copper nitrate: zinc nitrate: CTAB=5:5:1.

[0045] Step 4: Dissolve the precipitant sodium carbonate in deionized water at room temperature to form a colorless and transparent solution with a molar concentration of 0.40 mol / L.

[0046] Step 5: Raise the temperature of the copper-zinc solution in step 2 to 60°C, and slowly add sodium carbonate solution dropwise under continuous stirring, keeping the pH value at 7 to form a unifo...

Embodiment 2

[0051] Step one, two are with embodiment 1.

[0052] Step 3: Uniformly disperse the surfactant CTAB in the Cu and Zn solutions under the condition of continuous stirring. Cu(NO 3 ) 2 ·3H 2 O:Zn(NO 3 ) 2 ·6H 2 O:CTAB=10:10:1.

[0053] Steps 4, 5, 6 and 7 are the same as in Example 1.

[0054] Recorded as CZC-2, the results are shown in Table 1.

Embodiment 3

[0056] Step 1: Weigh 1.93 g Cu(NO 3 ) 2 ·3H 2 O, 2.38 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 300ml deionized water to obtain a clear blue solution.

[0057] Step 2: Dissolve the precipitant sodium carbonate in deionized water at room temperature to form a colorless and transparent solution with a molar concentration of 0.40 mol / L.

[0058] Step 3: Add 100ml of deionized water into a 2000ml beaker as the mother liquor. The temperature is controlled at 60°C. Slowly add sodium carbonate solution and copper-zinc mixture under continuous stirring conditions. The pH value is kept at 7 to form a uniform blue Cu, Zn precipitation.

[0059] Step 4: After the titration is completed, keep stirring for 1 hour. Let the precipitation stand for 12 hours, wash with warm water at 60°C, and carry out vacuum filtration. After repeated operations for 3-4 times, put the washed product in an evaporating dish, dry at 120°C for 12 hours, and put the dried solid in a muffle furnace Carry out c...

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PUM

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Abstract

The invention discloses a catalyst for preparing methanol by carbon dioxide hydrogenation and a preparation method thereof, and relates to a catalyst and a preparation method thereof; the catalyst takes copper nitrate, copper acetate or copper chloride as a copper source, and takes zinc nitrate and zinc acetate as a zinc source. Sodium carbonate, ammonium bicarbonate, ammonia water and urea are used as precipitants. The Cu-C3N4-M-ZnO catalyst is prepared by introducing graphite phase carbon nitride, simultaneously introducing transition metal chlorides and nitrates of VIII, IB and IIB groups of the periodic table of elements as cocatalysts, and adopting a coprecipitation method, a standing precipitation crystallization method and a solvothermal method. The preparation method of the catalyst comprises the following steps: an active component is complexed with a precipitant to obtain a precursor Cu-M-ZnO mother solution, C3N4 subjected to surface treatment is uniformly dispersed in the mother solution, self-assembly is performed through a standing precipitation crystallization method and a solvothermal method, and an active center grows along the surface of the C3N4 to obtain the Cu-C3N4-M-ZnO catalyst with a spongy porous structure. The catalyst comprises: 10 to 30 percent of Cu, 0.005 to 5 percent of cocatalyst M, 10 to 30 percent of C3N4 and the balance of active ZnO, and thecatalyst has good industrial application prospect.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for hydrogenation of carbon dioxide to methanol and a preparation method thereof. Background technique [0002] In recent years, global warming due to the greenhouse effect has attracted widespread attention. Global warming has caused a series of problems such as the melting of icebergs, permafrost and glaciers, frequent occurrence of extreme weather, and extinction of species. These problems have seriously threatened the survival of human beings and other species. According to the report of the United Nations Intergovernmental Panel on Climate Change (IPCC), among the types of gases that cause the greenhouse effect, CO 2 The resulting greenhouse effect accounts for about 60%. According to statistics, my country's CO 2 China's emissions have jumped to the second place in the world. my country is in a period of rapid industrial development. The governmen...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C29/154C07C31/04
CPCY02P20/52
Inventor 伞晓广钟美玲杨丝涵吴世鹏孟丹巩晓辉
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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