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Catalyst for synthesizing methanol by carbon dioxide hydrogenation and preparation and application thereof

A technology for carbon dioxide and methanol synthesis, which is applied in the preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, hydroxyl compound preparation, etc., can solve the problems of pH increase and catalyst activity reduction, and achieve good stability, The effect of increasing the conversion rate of carbon dioxide and increasing the yield of methanol

Active Publication Date: 2017-08-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may be due to the absorption of CO in the air by the mother liquor during the aging process 2 Carbonic acid is formed, and the carbonate radicals from the dissociation of carbonic acid participate in (CuZn) 2 (OH) 2 CO 3 The formation of the solution, while the additional hydroxide in the solution for charge balance makes the pH rise, while (CuZn) 2 (OH) 2 CO 3 The particles will grow up, and then the decomposed CuO and other particles will become larger, and the catalyst activity will decrease.

Method used

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  • Catalyst for synthesizing methanol by carbon dioxide hydrogenation and preparation and application thereof
  • Catalyst for synthesizing methanol by carbon dioxide hydrogenation and preparation and application thereof

Examples

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Embodiment 1

[0013] Weigh 18mmol Cu(NO 3 ) 2 ·3H 2 O, 9mmol Zn(NO 3 ) 2 ·6H 2 O, 2.1mmolAl(NO 3 ) 3 9H 2 O, 0.9mmol ZrO(NO 3 ) 2 2H 2 O is configured into 100mL aqueous solution, weigh 30mmolNa2CO 3 Configured as a 100mL aqueous solution, take 200mL deionized water and place it in a 500mL beaker, insert a pH meter, metal salt solution and Na 2 CO 3 The aqueous solution is co-precipitated at 70°C, the stirring speed is 600r / min, the pH is controlled at 7, and the precipitation speed is 3mL / min. After the precipitant is consumed, there is still about 20mL of the metal salt solution, and the obtained precipitation mother solution is aged at 70°C for 1h. During the aging process, use the remaining metal salt solution to adjust pH=7 for about 1 hour, cool, filter naturally, wash with deionized water for 5 times until the filtrate is free of sodium ions, filter with suction, dry at 60°C, and roast in air at 350°C for 4 hours to obtain Catalyst oxidation state precursor. Tablets wer...

Embodiment 2

[0016] The metal salt used is 18mmol Cu(NO 3 ) 2 ·3H 2 O, 6mmol Zn(NO 3 ) 2 ·6H 2 O, 3mmolAl(NO 3 ) 3 9H 2 O, 3mmol ZrO(NO 3 ) 2 2H 2 O, other steps are identical with embodiment 1.

Embodiment 3

[0018] Weigh 18mmol Cu(NO 3 ) 2 ·3H 2 O, 9mmol Zn(NO 3 ) 2 ·6H 2 O was prepared into 90mL aqueous solution, and 2.1mmol Al(NO 3 ) 3 9H 2 O, 0.9mmol ZrO(NO 3 ) 2 2H 2 O prepared into 10mL aqueous solution, weighed 32mmol Na2CO 3 Configured as a 107mL aqueous solution, take 200mL deionized water and place it in a 500mL beaker, insert a pH meter, AlZr metal salt solution and Na2CO 3 The aqueous solution was co-precipitated at 70°C, the stirring speed was 500r / min, the pH was controlled at 7, and the precipitation speed was 1.5mL / min. After the AlZr salt was consumed and aged for 0.5h, the CuZn salt solution was mixed with Na2CO 3 Co-precipitate the aqueous solution, control the pH=7, and stir at a speed of 600r / min. After the precipitant is exhausted, aging begins, and the remaining CuZn salt is used to continue adjusting pH=7 for about 1 hour. Other steps are identical with embodiment 1.

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Abstract

The invention relates to a catalyst for synthesizing methanol by carbon dioxide hydrogenation and a preparation and application thereof. The catalyst for synthesizing methanol by carbon dioxide hydrogenation is prepared from Cu (copper), Zn (zinc), Al (aluminum) and Zr (zirconium). The preparation method comprises the following steps of enabling CuZnAlZr salt and a precipitator to perform flow combining and co-precipitation, or enabling AlZr and CuZn to perform co-precipitation by steps, or enabling AlZr and CuZn to perform co-precipitation and pulping respectively; using the additional metal salt solution to strictly control the pH (potential of hydrogen) value in the aging process after precipitation. The catalyst has the advantages that the conversion rate of carbon dioxide and the yield of methanol are effectively increased, and the stability is good; under the same operation condition, compared with the typical CuZnAl catalyst for synthesizing the methanol, the space time yield of the methanol is increased by 8% to 10%.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for synthesizing methanol through hydrogenation of carbon dioxide, a preparation method and application thereof. Background technique [0002] carbon dioxide (CO 2 ) global climate change brought about by massive emissions has aroused great concern from the international community. Due to its large population base and rapid industrialization, China's emissions accounted for 29% of the world's total. In 2013, China's per capita carbon emissions also surpassed that of the EU for the first time. Also because of this China is facing a lot of international pressure, in our country CO 2 emissions reductions must be implemented as soon as possible. Using solar photolysis water and other renewable energy to electrolyze water to produce hydrogen, using CO 2 Hydrogenation technology catalyzes the synthesis of fuels and chemicals, which is one of the effective ways to sol...

Claims

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Application Information

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IPC IPC(8): B01J23/80C07C29/154C07C31/04
CPCY02P20/52B01J23/80C07C29/154C07C31/04
Inventor 李灿王集杰李泽龙蒋宗轩卢胜梅李军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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