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Preparation method of Cu/ZnO catalyst for preparing methanol from synthesis gas

A catalyst and methanol production technology, which can be used in catalyst activation/preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of cumbersome and time-consuming preparation process, and achieve the effect of excellent catalytic performance

Inactive Publication Date: 2011-04-20
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is cumbersome and time-consuming, and the prepared catalyst must undergo a reduction process before it can be used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The mixed nitrate (Cu(NO 3 ) 2 ·3H 2 O and Zn(NO 3 ) 2 ·6H 2 O, the molar ratio is 1:1) and citric acid (C 6 h 8 o 7 ) was mixed and dissolved in distilled water at a molar ratio of 1:1, and NH 3 ·H 2 O adjusted the pH to 7, at 80 o C complexation for 4 hours, and then at 90 o C steamed until viscous, transfer to 120 o C oven dry for 24 hours. Then place the xerogel in an argon-protected tube furnace, and raise the temperature of the furnace from room temperature to 240 o C, the dry gel begins to burn violently and slowly rises to 400 o C, keep warm for 1 hour, and then cool down to room temperature with the furnace to obtain Cu / ZnO catalyst.

[0020] The prepared catalyst was directly used to catalyze the reaction of syngas to methanol at low temperature, showing excellent catalytic performance, the conversion rate of CO was 56%, and the selectivity of methanol was 14%.

Embodiment 2

[0022] The mixed nitrate (Cu(NO 3 ) 2 ·3H 2 O and Zn(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:1) and citric acid (C 6 h 8 o 7 ) was mixed and dissolved in distilled water at a molar ratio of 1:0.8, and NH 3 ·H 2 O adjusted the pH to 7, at 80 o C complexation for 4 hours, and then at 90 o C steamed until viscous, transfer to 120 o C oven dry for 24 hours. Then place the xerogel in an argon-protected tube furnace, and increase the temperature of the furnace from room temperature to 240 o C, the dry gel begins to burn violently and slowly rises to 400 o C, keep warm for 1 hour, and then cool down to room temperature with the furnace to obtain Cu / ZnO catalyst.

[0023] The prepared catalyst was directly used to catalyze the reaction of syngas to methanol at low temperature, showing excellent catalytic performance, the conversion rate of CO was 58%, and the selectivity of methanol was 16%.

Embodiment 3

[0025] The mixed nitrate (Cu(NO 3 ) 2 ·3H 2 O and Zn(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:1) and tartaric acid (C 4 h 6 o 6 ) was mixed and dissolved in distilled water at a molar ratio of 1:1, and NH 3 ·H 2 O adjusted the pH to 7, at 80 o C complexation for 6 hours, and then at 90 o C steamed until viscous, transfer to 120 o C oven dry for 24 hours. Then place the xerogel in an argon-protected tube furnace, and increase the temperature of the furnace from room temperature to 240 o C, the dry gel begins to burn violently and slowly rises to 450 o C, keep warm for 1 hour, and then cool down to room temperature with the furnace to obtain Cu / ZnO catalyst.

[0026] The prepared catalyst was directly used to catalyze the low-temperature methanol-to-methanol reaction from syngas, showing excellent catalytic performance, the conversion rate of CO was 56%, and the selectivity of methanol was 13%.

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Abstract

The invention discloses a preparation method of a Cu / ZnO catalyst for preparing methanol from synthesis gas, which relates to a method for preparing a catalyst. The method comprises the following steps: mixing Cu2+ with Zn2+ in a nitrate, then complexing the obtained mixture and a polyhydroxy organic acid so as to obtain a collosol, and drying the collosol so as to obtain a xerogel, wherein in a reducing atmosphere formed by NH4NO3 (formed by NO3.H2O for adjusting the pH value and NO3-) and polyhydroxy organic acid in the process of combustion in an inert atmosphere, the Cu2+ is reduced into monoatomic Cu, but the Zn2+ is not reduced in the process of combustion and exists in the form of ZnO. The Cu / ZnO catalyst prepared by using the method provided by the invention can directly be applied to the reaction of preparing the methanol from the synthesis gas without a reductive passivation process, and has a good catalytic activity. The method disclosed by the invention has the advantages of mild reaction condition, low equipment cost and high catalytic performance and the like, and is simple to operate.

Description

technical field [0001] The invention relates to a catalyst, in particular to a preparation method of a Cu / ZnO catalyst for methanol production from synthesis gas. Background technique [0002] Methanol is a basic chemical raw material with a large demand, and is widely used in a series of organic chemical products such as formaldehyde, polyoxymethylene, methyl tert-butyl ether, dimethyl ether, acetic acid, methyl acrylate, methyl formate, and dimethyl carbonate , can also be used in solvents, fuels, and crop accelerators. At present, synthesis gas is mostly used to produce methanol, and its applied catalysts are mostly based on Cu / ZnO. The traditional method of preparing Cu / ZnO catalyst is Na2CO3 co-precipitation method, that is, the mixed nitrate solution and Na2CO3 solution are added dropwise to a small amount of high-speed stirred deionized water at the same time, while keeping the pH of the solution between 7 and 8, the co-precipitation is complete. Finally, the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/00C07C31/04C07C29/154
CPCY02P20/52
Inventor 张学军宁志高高春香任保轶由立新
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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