A kind of carbon-modified copper-based catalyst and its preparation method and application
A copper-based catalyst, carbon modification technology, applied in the preparation of hydroxyl compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low conversion rate and methanol selectivity, low methanol selectivity, etc., to improve the conversion rate efficiency, high catalytic activity, and the effect of avoiding agglomeration
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[0044] The present invention provides a preparation method of the carbon-modified copper-based catalyst described in the above technical scheme, (i) when the active component includes copper oxide, zinc oxide and aluminum oxide, the preparation method of the carbon-modified copper-based catalyst Include the following steps:
[0045] Mixing the metal salt, precipitating agent and water for coprecipitation reaction to obtain coprecipitate;
[0046] The co-precipitate is subjected to aging and first roasting in sequence to obtain a copper-based catalyst;
[0047] Mixing the copper-based catalyst and the aromatic hydrocarbon, and performing a second calcination to obtain a carbon-modified copper-based catalyst;
[0048] The metal salt is a metal salt corresponding to the metal element in the active component.
[0049] The invention mixes metal salt, precipitating agent and water to carry out co-precipitation reaction to obtain co-precipitate; the metal salt is the metal salt cor...
Embodiment 1
[0075] (1) 6.0g Cu(NO 3 ) 2 ·3H 2 O, 4.4g Zn(NO 3 ) 2 ·6H 2 O and 8.8g Al(NO 3 ) 3 9H 2 O was dissolved in 63mL deionized water to obtain a metal salt solution; 10.6g Na 2 CO 3 Dissolve in 100mL deionized water to get Na 2 CO 3 solution; under the conditions of 70°C and 900r / min, the metal salt solution and Na 2 CO 3 The solution was co-flowed in 200mL deionized water, the pH of the system was controlled to be 7, the co-precipitation reaction was carried out for 2 hours, and it was aged at 30°C for 12 hours. The obtained reaction system was filtered and washed with water in sequence, and then dried at 80°C. 12h, obtain coprecipitate;
[0076] (2) The co-precipitate was roasted at 350°C for 5h, then tableted, crushed, and sieved to obtain particles with a particle size of 20 to 40 meshes, and then heated in H 2 / N 2 Atmosphere (H 2 volume fraction is 5%), reduced at 300°C for 7h to obtain Cu-ZnO-Al 2 o 3 Copper-based catalysts (Cu:ZnO:Al 2 o 3 Mass ratio=4:3...
Embodiment 2
[0079] (1) 6.0g Cu(NO 3 ) 2 ·3H 2 O, 4.4g Zn(NO 3 ) 2 ·6H 2 O and 8.8g Al(NO 3 ) 3 9H 2 O was dissolved in 63mL deionized water to obtain a metal salt solution; 10.6g Na 2 CO 3 Dissolve in 100mL deionized water to get Na 2 CO 3 solution; under the conditions of 70°C and 900r / min, the metal salt solution and Na 2 CO 3 The solution was co-flowed in 200mL deionized water, the pH of the system was controlled to be 7, the co-precipitation reaction was carried out for 2 hours, and it was aged at 30°C for 12 hours. The obtained reaction system was filtered and washed with water in sequence, and then dried at 80°C. 12h, obtain coprecipitate;
[0080] (2) Calcinate the co-precipitate at 350°C for 5 hours, and then sequentially perform tableting, crushing, and sieving of particles with a particle size of 20 to 40 meshes to obtain CuO-ZnO-Al 2 o 3 Copper-based catalysts (CuO:ZnO:Al 2 o 3 Mass ratio=5:3:3,, abbreviated as CuOZA);
[0081] (3) Add 1.1mL benzene dropwise t...
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