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Catalyst for preparing acetaldehyde by dehydrogenation of ethanol, its preparation method and application

A technology of catalysts and supported catalysts, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problem of low acetaldehyde selectivity and achieve high acetaldehyde selectivity and simple preparation methods Effect

Active Publication Date: 2017-10-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the selectivity of acetaldehyde, many researchers in Cu / SiO 2 Doping with alkali metals or alkaline earth metals [Zhang Yue, master’s dissertation, Tianjin University, China, 2007; Ind.Eng.Chem.Res., 1998, 37: 2618-2622], or increase the space velocity of the reaction and reduce the residence time time [Appl.Catal.A: General, 2006, 304: 30-39], yet these methods cannot essentially solve the problem of low acetaldehyde selectivity in the reaction process

Method used

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  • Catalyst for preparing acetaldehyde by dehydrogenation of ethanol, its preparation method and application
  • Catalyst for preparing acetaldehyde by dehydrogenation of ethanol, its preparation method and application
  • Catalyst for preparing acetaldehyde by dehydrogenation of ethanol, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation process of mesoporous carbon supported Cu catalyst:

[0025] (1) Prepare Cu(NO 3 ) 2 ·3H 2 O aqueous solution;

[0026] (2) At 25°C, take an equal volume of the above solution and impregnate it on mesoporous carbon, and let it stand for 0.5-2 hours;

[0027] (3) drying the mixture after step (2) standing at 50° C. for 10 to 12 hours to obtain a catalyst precursor;

[0028] (4) Dry the precursor obtained in step (3) at 140°C for 0.5h, then hydrogen reduction at 450°C or 350°C for 2h (10vol%H 2 / N 2 ), respectively prepared 5Cu / mesoporous carbon (No. 2 in Table 1) catalyst and 10Cu / mesoporous carbon (No. 4 in Table 1) catalyst.

[0029] The XRD pattern of 10Cu / mesoporous carbon catalyst is as follows figure 1 shown.

Embodiment 2

[0031] Preparation process of biochar-supported Cu catalyst:

[0032] (1) Take biomass coconut shells, wash them with water, dry them, and primary crush them, and then carry out pyrolysis treatment in an inert gas atmosphere at 600°C for 2 hours; the pyrolysis products are further ground and pulverized, and then pyrolyzed again at 800°C for 2 hours in an inert atmosphere to obtain biomass coconut shell charcoal;

[0033] (2) At 25°C, take Cu(NO 3 ) 2 ·3H 2 On the biochar prepared by impregnating the equal volume of O aqueous solution in step (1), let stand for 2h;

[0034] (3) drying the mixture after step (2) at 50° C. for 10 h to obtain a catalyst precursor;

[0035] (4) Dry the catalyst precursor obtained in step (3) at 140°C for 0.5h, followed by hydrogen reduction at 450°C for 2h (10vol%H 2 / N 2 ), prepared 10Cu / biomass charcoal (No. 15 in Table 1) catalyst. The XRD pattern of gained catalyst is as figure 2 shown.

[0036] The preparation condition process of ot...

Embodiment 3

[0040] Experiments on ethanol dehydrogenation catalyzed by Cu catalysts supported on different carbon supports.

[0041] Using ethanol as raw material, the ethanol dehydrogenation reaction is carried out in a fixed bed reactor. The reaction conditions are as follows: a fixed-bed reactor with an inner diameter of 8 mm is filled with catalyst, under normal pressure, the reaction temperature is 260° C., and the ethanol liquid phase flow rate is 0.3 mL / h. After the reaction was stable, the reaction raw materials and products were analyzed by online chromatography. Table 2 shows the correspondence between sample numbers and ethanol dehydrogenation activity.

[0042] Table 2 The corresponding relationship between the sample numbers of Example 3 and the ethanol dehydrogenation activity

[0043] serial number

[0044] 3

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Abstract

The invention provides a catalyst for preparing acetaldehyde by ethanol dehydrogenation and its preparation method and application. The catalyst in the invention is a supported catalyst, the active component is Cu, and the carrier of the catalyst is a carbon material; the active component The content of Cu is 0.1-30wt%. The catalyst provided by the invention has very high acetaldehyde selectivity, and the acetaldehyde selectivity is higher than 92.1%; and the preparation method provided by the invention is simple and does not need to add any auxiliary agent.

Description

technical field [0001] The invention relates to a catalyst for preparing acetaldehyde by dehydrogenation of ethanol, a preparation method and an application thereof, and belongs to the technical field of chemical catalysis. In particular, it refers to the catalyst used to prepare acetaldehyde by dehydrogenating ethanol under the condition of gas phase and normal pressure. Background technique [0002] Acetaldehyde is an important aliphatic compound, which is a raw material for the preparation of (per)acetic acid, pentaerythritol, pyridine, butanediol, ethyl acetate, chloral and other important chemicals, and is widely used in agriculture, industry and daily life Life and other fields have high application value. [0003] At present, the synthesis route of acetaldehyde mainly includes ethylene oxidation method, acetylene hydration method, acetic acid reduction method, ethane oxidation method, CH 4 And CO synthesis method, ethanol oxidative dehydrogenation method and ethanol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72C07C47/06C07C45/51
Inventor 陆安慧王庆楠石磊
Owner DALIAN UNIV OF TECH
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