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

A catalyst and catalyst carrier technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of low acetaldehyde selectivity and achieve high acetaldehyde Selectivity, simple preparation method, and the effect of ensuring stability

Active Publication Date: 2019-06-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above 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 direct dehydrogenation of ethanol, preparation method and application thereof
  • Catalyst for preparing acetaldehyde by direct dehydrogenation of ethanol, preparation method and application thereof
  • Catalyst for preparing acetaldehyde by direct dehydrogenation of ethanol, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] SiO 2 Preparation process of coated carbon carrier:

[0048] (1) take trimethylbenzene as solvent, prepare 10 and 40vol% furfuryl alcohol / trimethylbenzene solution, add trace oxalic acid simultaneously as catalyst;

[0049] (2) Impregnate the carrier once with an equal volume of the furfuryl alcohol solution prepared in step (1); after the impregnation, let stand at room temperature for 0.5-2 hours;

[0050] (3) Place the mixture after step (2) standing in an oven at 60°C and 80°C for 12 hours to dry;

[0051] (4) Dry the dried product in step (3) at 150°C for 3h in an Ar atmosphere, and then stay at 850°C for 2h to obtain the C-coated SiO 2 Surface C / SiO 2 Complex.

[0052] (5) Using 10 and 40vol% furfuryl alcohol / trimethylbenzene solution, SiO 2 The thickness of the surface carbon layer is 0.5 and 1.5nm, respectively, and the carbon content is 9 and 24wt%, respectively, and the obtained supports are respectively recorded as 9C / SiO 2 -Furfuryl alcohol and 24C / SiO...

Embodiment 2

[0054] Al 2 o 3 Preparation process of coated carbon carrier:

[0055] (1) Using acetylene as the carbon source, the C / Al on the surface of the carbon layer was prepared by chemical vapor deposition. 2 o 3 Composite carrier;

[0056] ②Place the chemical vapor deposition furnace horizontally, place the porcelain boat carrying 1.0g sample in the constant temperature zone of the furnace, and purge with Ar for 30 minutes;

[0057] ③ Place the Al placed in step ② 2 o 3 Dry at 150°C for 2 hours under an Ar inert atmosphere to remove surface-adsorbed water and other impurities;

[0058] ④ Heat the dried product in step ③ to 600°C for 1 hour under an Ar inert atmosphere; then pass 100 mL / min of 10vol% C 2 h 2 / Ar gas, and then stay at 600°C for 0.1h to obtain the C coated on Al 2 o 3 Surface C / Al 2 o 3 Complex. Then close the C 2 h 2 / Ar gas, replace it with Ar gas, continue purging for 1h, and then cool down to room temperature. The tested carbon content is 8.6wt%, an...

Embodiment 3

[0060] 9C / SiO 2 -Furfuryl alcohol and 24C / SiO 2 -The preparation process of furfuryl alcohol supported Cu catalyst:

[0061] (1) Take 9C / SiO 2 - Furfuryl alcohol, dried in an airflow oven at 120°C for 2 hours to remove physically adsorbed water on the surface;

[0062] (2) At 25°C, take Cu(NO 3 ) 2 ·3H 2 9C / SiO obtained by drying the obtained 9C / SiO 2 - on furfuryl alcohol charcoal, stand for 2h;

[0063] (3) drying the mixture after step (2) at 50° C. for 10 h to obtain a catalyst precursor;

[0064] (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 ), making 10Cu / 9C / SiO 2 - Furfuryl alcohol (No. 3 in Table 1) catalyst.

[0065] (5) 24C / SiO2 2 -The furfuryl alcohol-supported copper catalyst process is the same as the above steps, corresponding to No. 7 in Table 1.

[0066] The XRD pattern of gained catalyst is as figure 1 shown.

[0067] The preparation condition process of oth...

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Abstract

The invention provides a catalyst for preparing acetaldehyde through direct dehydrogenation of ethyl alcohol as well as a preparation method and an application thereof and belongs to the technical field of chemical catalysis. The catalyst comprises the following components in percentage by mass: 0.1-30wt% of an active component which is Cu and 70-99.9wt% of a carrier which is a carbon-coated oxide compound, wherein the carrier comprises the following components in percentage by mass: 0.5-50wt% of C and the balance of oxide. The catalyst has extremely high selectivity which is higher than 92.1%; moreover, the catalyst is excellent in stability and almost has no inactivation in 40 hours during test.

Description

technical field [0001] The invention relates to a catalyst for preparing acetaldehyde by direct dehydrogenation of ethanol, a preparation method and an application thereof, belonging to the technical field of chemical catalysis. In particular, it refers to the catalyst for preparing acetaldehyde by dehydrogenating ethanol under the condition of gas phase and normal pressure. Background technique [0002] Acetaldehyde is an important aliphatic compound, widely used in agriculture, industry and daily life, etc. Alcohol, ethyl acetate, chloral and other important chemical raw materials, with 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 and ethanol oxidative dehydrogenation method. The above-mentioned acetaldehyde production method has a series of problems such as equipment corrosion, env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/51C07C47/06B01J23/72
CPCB01J23/72C07C45/512C07C47/06
Inventor 陆安慧王庆楠
Owner DALIAN UNIV OF TECH
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