Catalyst for preparing ethanol by virtue of acetate hydrogenation and preparation method thereof

An acetate hydrogenation and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve problems such as large-scale application, poor catalyst stability, harsh process conditions, etc., and achieve high thermal stability and high thermal stability. Hydrogenation activity and effects of stability, high hydrogenation activity and selectivity, improved sintering resistance

Active Publication Date: 2013-03-20
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disadvantages of harsh process conditions, poor catalyst stability, and low selectivity, it has not been widely used so far.
[0005] Chinese patent CN101934228A reports a copper-based catalyst for the hydrogenation of acetate to ethanol, ...

Method used

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  • Catalyst for preparing ethanol by virtue of acetate hydrogenation and preparation method thereof
  • Catalyst for preparing ethanol by virtue of acetate hydrogenation and preparation method thereof
  • Catalyst for preparing ethanol by virtue of acetate hydrogenation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Catalyst preparation

[0046] Weigh 11 g of CTAB (cetyltrimethylammonium bromide) and place it in a beaker of 270 g of water and fully dissolve it, add 51.4 g of TEOS (tetraethyl silicate); then add 2.2 g of NaOH to make The pH value is between 11-11.5; raise the temperature of the water bath to 80°C and stir for 2 h to form the mother liquor of MCM-41 molecular sieve; weigh 15.2g Cu(NO 3 ) 2 ·3H 2 O and 51.7ml of 25% ammonia water were added to 150ml of water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4h; weighed 0.53g La(NO 3 ) 3 ·6H 2 Add O into the slurry; then raise the temperature of the water bath to 80°C to volatilize the ammonia gas, stop heating when the pH value is lower than 7; then put the slurry into a stainless steel crystallization kettle and crystallize at 120°C 24 hours; after the crystallization was completed, take it out and cool, fi...

Embodiment 2

[0051] Catalyst preparation

[0052] Weigh 11 g of CTAB and place it in a beaker of 270 g of water and fully dissolve it, add 59.4 g of TEOS; then add 2.2 g of NaOH to make the pH value between 11-11.5; increase the temperature of the water bath to 80 ° C and stir for 2 h forms the mother liquor of MCM-41 molecular sieve; Weigh 7.6g Cu(NO 3 ) 2 ·3H 2 O and 25.8ml of 25% ammonia water were added into 150ml water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4h; weighed 1.06g La(NO 3 ) 3 ·6H 2 O was added to the slurry; then the water bath was heated to 80°C to volatilize the ammonia gas, and the heating was stopped when the pH value was lower than 7; then the slurry was put into a stainless steel crystallization kettle and crystallized at 120°C for 24 hours; after the crystallization is completed, take it out and cool it, filter it, and wash it until neutral; then...

Embodiment 3

[0057] Catalyst preparation

[0058] Weigh 11 g of CTAB, place it in a beaker of 270 g of water and fully dissolve it, add 40 g of TEOS; then add 2.2 g of NaOH to make the pH value between 11-11.5; increase the temperature of the water bath to 80 °C and stir for 2 h Form the mother liquor of MCM-41 molecular sieve; Weigh 22.8g Cu(NO 3 ) 2 ·3H 2 O and 77.5ml of 25% ammonia water were added to 150ml of water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4 h; weighed 2.7g La(NO 3 ) 3 ·6H 2 O was added to the slurry; then the water bath was heated to 80°C to volatilize the ammonia gas, and the heating was stopped when the pH value was lower than 7; then the slurry was put into a stainless steel crystallization kettle and crystallized at 120°C for 24 hours; after the crystallization is completed, take it out and cool it, filter it, and wash it to neutrality; then dry ...

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Abstract

The invention relates to a catalyst for preparing ethanol by acetate hydrogenation as well as a preparation method and application of the catalyst. The catalyst comprises a mesoporous silica molecular sieve, an active copper component, and an oxide assistant of one or two elements of La and Ce. The catalyst comprises the following components in percentage by weight: 50-90% of silicon oxide, 10-50% of active copper component, and 0.1-20% of assistant. The preparation method of the catalyst combines a unique structure in the mesoporous molecular sieve MCM-41 forming process, a stilling ammonia precipitation-crystallization method is adopted to prepare a high dispersion copper-based and silicon-based catalyst, and the catalyst is favorable for enhancing the dispersion degree of the copper, and is suitable for forming the valence state distribution of the copper. The catalyst provided by the invention is used in the reaction of preparing ethanol by acetate hydrogenation, the conversion ratio of acetate is 98.5%, and the ethanol selectivity is 99.6%, and the hydrogenation activity, selectivity and stability are extremely high.

Description

technical field [0001] The invention relates to a catalyst for hydrogenation of acetate to produce ethanol and a preparation method thereof. The invention adopts the combined method of ammonia distillation and crystallization to prepare the copper-silicon-based catalyst, and the method promotes the formation of more stable layered silicate structures of copper and silicon, thereby greatly improving the high dispersion of copper. The obtained catalyst has high thermal stability, hydrogenation activity and stability in the acetate hydrogenation reaction, reduces waste discharge and greatly reduces subsequent separation costs. Background technique [0002] Ethanol, commonly known as alcohol, as an important chemical raw material, is widely used in food, medicine, chemical industry, national defense and other fields. Since the oxygen content of ethanol is as high as 34.7%, it can also be added to gasoline as a substitute for methyl tert-butyl ether (MTBE) to obtain ethanol gas...

Claims

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Application Information

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IPC IPC(8): B01J29/03C07C31/08C07C29/149
Inventor 赵玉军吕静马新宾曹新园王胜平王保伟李振花徐艳
Owner TIANJIN UNIV
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