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Preparation method and application of NiCu/SiO2 catalyst for efficiently catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde

A technology for catalyzing benzyl alcohol and catalysts, which is applied in the field of high-dispersion NiCu/SiO2 catalysts and its preparation, can solve the problems of poor dispersion effect, difficulty in further improving catalytic activity, and large amount of Ni added, and achieve low side reactions , high atom utilization, and good catalytic activity

Pending Publication Date: 2022-07-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology contains Ni as a catalyst additive, but most of the existing Ni elements are added in a large amount or the dispersion effect is poor, and the catalytic activity is difficult to further improve

Method used

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  • Preparation method and application of NiCu/SiO2 catalyst for efficiently catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde
  • Preparation method and application of NiCu/SiO2 catalyst for efficiently catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde
  • Preparation method and application of NiCu/SiO2 catalyst for efficiently catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Under nitrogen protection and continuous stirring, an aqueous solution of ascorbic acid was added to a mixed aqueous solution of copper nitrate trihydrate and polyvinylpyrrolidone (PVP), wherein the molar ratio of copper nitrate to PVP was 200:1, and the ascorbic acid and copper nitrate were The mass ratio is 1:20. Then, the aqueous solution of sodium borohydride was added dropwise to the mixed solution, wherein the mass ratio of sodium borohydride to copper nitrate was 1:10, and it could be observed that the brown solid was continuously precipitated.

[0037] After calcining the fumed silica in a muffle furnace at 650 °C for 12 hours for pre-activation, the fumed silica is fully dispersed in water. The fumed silica suspension was added dropwise to the above three-necked flask, wherein the mass ratio of copper nitrate trihydrate to fumed silica was 5:2. After stirring continuously for 1 h, it was filtered and washed three times with deionized water, and the filter resi...

Embodiment 2

[0050] Compared with Example 1, the difference is: Nickel nitrate and Cu / SiO 2 The mass ratio is 1: 20, and other steps are with embodiment 1, and the catalyst that finally obtains is NiCu / SiO 2 (1:20).

[0051] 0.5g of catalyst was weighed and put into the fixed bed, and benzyl alcohol solution was passed into it under the protection of 10ml / min of argon, and the temperature was raised to 340°C to carry out the reaction, and the reaction pressure was normal pressure, and the reaction selectivity: 78.2%; : 90.4%; reaction yield: 70.7%.

[0052] Under the condition that other conditions remain unchanged, the temperature is raised to 220° C. to carry out the reaction, and the reaction selectivity: 70.4%; the reaction conversion rate: 30.7%; the reaction yield: 21.6%.

[0053] Under the condition that other conditions remain unchanged, the temperature is raised to 240° C. to carry out the reaction, and the reaction selectivity: 76.3%; the reaction conversion rate: 35.1%; the re...

Embodiment 3

[0060] Compared with Example 1, the difference is: the nickel nitrate and Cu / SiO 2 The mass ratio is 1: 100, and other steps are the same as in Example 1, and the catalyst finally obtained is NiCu / SiO 2 (1:100).

[0061] Weigh 0.5g of catalyst and put it into the fixed bed, and pass benzyl alcohol solution under the protection of 10ml / min of argon, heat up to 360 ℃ to carry out the reaction, the reaction selectivity: 83.7%; the reaction conversion rate: 88.4%; the reaction yield Rate: 74.0%.

[0062] Under the condition that other conditions remain unchanged, the temperature is raised to 220° C. to carry out the reaction, and the reaction selectivity: 76.5%; the reaction conversion rate: 32.5%; the reaction yield: 24.9%.

[0063] Under the condition that other conditions remain unchanged, the temperature is raised to 240° C. to carry out the reaction, and the reaction selectivity: 79.4%; the reaction conversion rate: 36.0%; the reaction yield: 28.6%.

[0064] Under the cond...

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Abstract

The invention belongs to the field of catalysts, and particularly relates to a preparation method and application of a NiCu / SiO2 catalyst for efficiently catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde, supported Cu / SiO2 is prepared through a chemical deposition method, and a small amount of Ni is doped on the basis of the catalyst to form the high-dispersity NiCu / SiO2 catalyst. Under certain reaction conditions, a fixed bed device is adopted to catalyze benzyl alcohol dehydrogenation to prepare benzaldehyde. The high-dispersity NiCu / SiO2 catalyst disclosed by the invention can efficiently catalyze and dehydrogenize benzyl alcohol to prepare benzaldehyde under proper conditions, and has very excellent yield and stability, the selectivity of the product at 360 DEG C reaches 95% or above, and the yield reaches 85% or above. The preparation conditions are easy to control, the method is environment-friendly, the process is simple, the operability is good, and the obtained material has the characteristics of high catalytic efficiency, low energy consumption, high stability, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a highly dispersive NiCu / SiO suitable for catalyzing benzyl alcohol dehydrogenation to prepare benzaldehyde 2 Catalyst and preparation method thereof. Background technique [0002] At present, the mainstream benzaldehyde production processes in China are: benzoic acid or methyl benzoate reduction method, benzyl chloride hydrolysis method, styrene catalytic oxidation method, toluene selective oxidation method and benzyl alcohol oxidation method. These processes have their own merits, but most of them need to be improved in terms of environmental protection. The acid and alkali in the benzyl chloride hydrolysis method used in the traditional industry will cause corrosion to the equipment and reduce the service life of the equipment. And the production process will cause pollution to the environment. And the traditional toluene oxidation method produces a large amount of benz...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J37/16B01J37/18C07C45/00C07C47/54
CPCB01J23/755B01J37/16B01J37/18C07C45/002B01J35/40C07C47/54Y02P20/584
Inventor 马江权史明豪李正萍李楠孙桂芳吴棉棉周维友
Owner CHANGZHOU UNIV
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