Pd-Au/C bimetallic catalyst, preparation method thereof and application of catalyst

A bimetallic catalyst, catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the difficulty of high conversion rate, high selectivity and low activity of phenol and other problems, to achieve the effect of good catalytic hydrogenation performance, high phenol conversion rate, and good electronic effect.

Inactive Publication Date: 2019-03-12
CHENZHOU GAOXIN PLATINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low activity of general catalysts under mild conditions, and cyclohexanone is easy to be further hydrogenated to produce by-products such as cyclohexanol
Therefore, it is a difficult catalytic problem to achieve high conversion of phenol (>80%) and high selectivity of cyclohexanone (>95%) under mild conditions.

Method used

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  • Pd-Au/C bimetallic catalyst, preparation method thereof and application of catalyst
  • Pd-Au/C bimetallic catalyst, preparation method thereof and application of catalyst
  • Pd-Au/C bimetallic catalyst, preparation method thereof and application of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1) Synthesis of palladium sol: Dissolve 6 mL of palladium chloride solution (palladium content of 25 g / L) and 0.1 g of trisodium citrate in 50 mL of ethylene glycol, stir for 1 hour, then add 10 w.t.% sodium carbonate solution dropwise to adjust Solution pH=4.5, keep warm at 90°C in an oil bath for 2h, cool to room temperature to obtain opaque palladium sol;

[0028] 2) Synthesis of Pd-Au nanoparticles: under stirring, disperse 2mL of chloroauric acid solution (gold content is 5g / L) in the palladium sol in step 1), add 1.0w.t.% oxalic acid reducing agent 15mL dropwise, adjust pH=8 , the temperature was raised to 60°C, and the temperature was kept constant for 1.5h.

[0029] 3) Pd-Au / C: Disperse 4.84g of coconut shell activated carbon in the system of step 2), stir and adsorb at 60°C for 6h, move to room temperature, add 25% alcohol equal to the volume of the system, continue to stir for 4h, and let the Leave overnight. After filtration, washing and vacuum drying, a Pd...

Embodiment 2

[0031] With embodiment 1, difference is that palladium content is 2% in the catalyst, and gold content is 0.3%.

Embodiment 3

[0033] With embodiment 1, difference is that palladium content is 4% in the catalyst, and gold content is 0.5%.

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Abstract

The invention relates to a Pd-Au / C bimetallic catalyst, a preparation method thereof and an application of the catalyst. The catalyst comprises a carrier and active components, the carrier is activated carbon, the active components are Pd-Au composite nano-particles with hetero-structures and account for 1-5w.t.% of the total weight of the catalyst, and the weight ratio of palladium to gold is (1-30):1. The preparation process of the catalyst includes the steps: firstly, synthesizing palladium sol; secondly, reducing the gold and self-assembling the gold on palladium nano-particles to form thePd-Au composite nano-particles; finally, adsorbing the Pd-Au composite nano-particles onto coconut shell activated carbon to obtain the Pd-Au / C bimetallic catalyst. The catalyst can be used for catalytic hydrogenation, catalytic oxidation and catalytic dehydrogenation reaction, and particularly, high conversion rate (100%) of phenol and high selectivity (96.8%) of cyclohexanone are realized in reaction of selectively hydrogenating the phenol under mild reaction conditions to prepare the cyclohexanone.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a Pd-Au / C bimetallic catalyst and its preparation method and application, in particular to the application of the catalyst in the reaction of preparing cyclohexanone by selective hydrogenation of phenol. Background technique [0002] Nano-noble metal (such as palladium, platinum, rhodium, ruthenium) catalysts have excellent hydrogenation performance, and are often used in the selective hydrogenation of alkenes, nitro, nitroso, ketones, aldehydes, etc., and play an extremely important role in the chemical industry. status. In particular, when two components form a bimetallic nanocomposite structure (such as Pd-Au nanoparticles), there are generally three structures: alloy structure (Alloy), core-shell structure (Core-Shell, only one metal is exposed) , heterostructure (Heterostructrue, both metals and their interfaces are exposed), as attached figure 1 shown. As active components of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/10B01J37/16B82Y30/00B82Y40/00C07C45/00C07C49/403
CPCB01J23/52B01J35/1028B01J37/16B82Y30/00B82Y40/00C07C45/006C07C2601/14C07C49/403
Inventor 杨拥军欧阳文兵雷婧叶咏祥雷涤尘杨静
Owner CHENZHOU GAOXIN PLATINUM
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