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

A carbon dioxide and catalyst technology, applied in the field of palladium-zinc catalysts, can solve problems such as catalysts that need to be improved urgently, and achieve the effects of active and stable, easy to manufacture and high selectivity

Inactive Publication Date: 2009-06-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from a practical point of view, the activity of the currently reported catalysts needs to be improved urgently, and the development of more effective CO 2 Hydrogenation of methanol catalysts has been the goal of many research efforts

Method used

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  • Catalyst used for preparing methanol by hydrogenation of carbon dioxide and a preparation method thereof
  • Catalyst used for preparing methanol by hydrogenation of carbon dioxide and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.167g of PdCl 2 (purity is AR grade) dissolved with concentrated hydrochloric acid, put into a beaker filled with 50mL ethylene glycol (purity is AR grade), add 0.157g KOH (purity is AR grade) aqueous solution (concentration is 4mol / L), Maintain the pH value of the solution in the range of 4.5 to 5.0, stir for 30 minutes, then add 1.500 g of purified CNT, the feed solution is ultrasonically treated for 30 minutes, and then placed in a microwave oven (2450MHz, 640W); microwave radiation heating for 100s, cooling 20s, reheated for 10s, repeated cooling for 20s, reheated for 10s, took out the feed liquid and placed it in a cold water bath to let it cool rapidly, the feed liquid was filtered, and the filter cake was washed successively with acetone and deionized water until the filtrate was neutral. Dry at 110°C to obtain metal Pd-modified CNTs, whose stoichiometric formula is 5.0% Pd / CNT as determined by EDX analysis.

[0022] At 60°C, will contain 0.887g PdCl 2 (purity...

Embodiment 2

[0028] At 60°C, will contain 0.887g PdCl 2 (purity is AR grade) aqueous solution (concentration is 0.56mol / L) and contains 14.875g Zn(NO 3 ) 2 ·6H 2 After the aqueous solution (concentration of 1mol / L) of O (purity is AR grade) is mixed, it is quickly added dropwise to 140mL of Na with a concentration of 1mol / L. 2 CO 3 (Purity is AR grade) in a beaker of aqueous solution, carry out co-precipitation reaction under vigorous stirring, adjust Na 2 CO 3 The amount of solution added keeps the pH value of the reaction mixture at about 9.5, and the stirring is stopped after 30 minutes. The precipitate is centrifugally filtered, washed with deionized water until the filtrate is neutral, and then mixed with 0.404 g of CNT, beaten for 30 minutes, and centrifugally filtered again. The filter cake was dried at 110°C for 5 hours, pure N 2 Calcined at 360°C for 3 hours in the atmosphere, the stoichiometric formula is Pd 0.100 Zn 1 - 9.6% CNT catalyst (oxidation precursor state), pres...

Embodiment 3

[0031] At 65°C, will contain 0.142g PdCl 2 (purity is AR grade) aqueous solution (concentration is 0.56mol / L) and contains 14.875g Zn(NO 3 ) 2 ·6H 2 After the aqueous solution (concentration of 1mol / L) of O (purity is AR grade) is mixed, it is quickly added dropwise to 140mL of Na with a concentration of 1mol / L. 2 CO 3 (Purity is AR grade) in a beaker of aqueous solution, carry out co-precipitation reaction under vigorous stirring, adjust Na 2 CO 3 The amount of solution added keeps the pH value of the reaction mixture at about 9.5, and the stirring is stopped after 30 minutes. The precipitate is centrifugally filtered, washed with deionized water until the filtrate is neutral, and then mixed with 0.356 g of CNT, and centrifuged again after beating for 30 minutes. The filter cake was dried at 110°C for 6 hours, pure N 2 Calcined at 360°C for 4 hours in the atmosphere, the stoichiometric formula is Pd 0.016 Zn 1 - 9.6% CNT catalyst (oxidation precursor state), pressed i...

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Abstract

The invention discloses a catalyst used for preparing methanol by hydrogenation of carbon dioxide and a preparation method thereof, relating to a palladium-zinc catalyst which takes a carbon nanotube base material as an accelerating agent and a preparation method thereof; the catalyst contains main components of Pd and Zn and an accelerating agent of the carbon nanotube base material, the chemical formula is PdiZnj-x percent (CNT or y percent of Pd / CNT), and in the formula, i and j are mole ratio coefficients of relevant metallic elements in the main components of Pd-Zn, and x percent is mass percent of the accelerating agent of carbon nanotube base material in the catalyst; and the mass percentage of all the components is as follows: 2 percent to 25 percent of Pd, 55 percent to 90 percent of Zn and 6 percent to 20 percent of the accelerating agent of the carbon nanotube base material. During the preparation, the main components of Pd and Zn and the accelerating agent are coprecipitated and react and are dried and roasted so as to prepare the methanol. The activity of the catalyst is high and stable; the selectivity of the product of methanol is high; the conversion rate of hydrogenation of CO2 and space time yield of the methanol are obviously higher than the existing similar catalyst; the manufacturing is simple and convenient and the repetitiveness is good.

Description

technical field [0001] The invention relates to a catalyst, especially a palladium-zinc catalyst promoted by carbon nanotube-based nanomaterials. Background technique [0002] The greenhouse effect has been recognized as a serious threat to the environment of our planet, reducing CO, one of the major greenhouse gases 2 emissions have become a pressing issue. By hydroconversion, the CO 2 Processing into valuable fuels or chemicals is believed to currently fix large amounts of emitted CO 2 better handling method. In many CO 2 Among the possible products of hydrogenation, methanol has become the preferred target product because it is not only an important chemical raw material, but also a non-petroleum-based clean synthetic fuel. [0003] The research and development of catalysts is the key to the practical application of carbon dioxide hydrogenation to methanol. 2 The catalyst for methanol hydrogenation is mainly CuO-ZnO (or CuO-ZrO 2 )-based catalyst [Koeppel RA, et al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60C07C31/04C07C29/157
CPCY02P20/52
Inventor 张鸿斌梁雪莲林国栋
Owner XIAMEN UNIV
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