A method for preparing nanoscale spherical phenolic resin-loaded gold composite particles
A technology of phenolic resin and composite particles, which is applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of reduced catalytic activity, less deposition, catalyst poisoning, etc., and achieves high catalytic activity without reduction. agent, the effect of high loading rate
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Embodiment 1
[0021] Embodiment 1: Preparation of phenolic resin nano-spherical template
[0022] Add 0.2 mol of phenolic substances (resorcinol, phenol, 4-aminophenol), 0.1 mol of formaldehyde, and 200 microliters of ammonia solution with a mass fraction of 25% to 28 mL of alcohol-water mixed solution (the ratio of ethanol volume to water volume 2:5), heated at 30°C for 3h, and then put the above mixture into a closed reaction kettle and cured at 160°C for 6h to obtain a phenolic resin nanosphere template with a size of 200nm.
[0023] The phenolic resin spherical nanoparticle transmission electron microscope photograph that the present embodiment prepares sees figure 1 .
Embodiment 2
[0024] Embodiment 2: impregnation method carries out the loading of small gold particles (1)
[0025] The phenolic resin spherical nano-template (prepared from resorcinol) particles in Example 1 were dispersed into the aqueous solution, and the concentration was adjusted to 8 mg / mL. Add different volumes (50 μL, 100 μL, 200 μL, 300 μL, 400 μL, 500 μL) of chloroauric acid aqueous solution (27 mM) into 9 mL of water, and then add different volumes of water again, so that the volume of the entire system is 10 mL. Keep it in the dark for one hour, add 1 mL of phenolic resin solution, react at room temperature for 15 minutes, and centrifuge to obtain the final product. The sizes of the obtained small gold particles are 3.2, 3.7, 4.2, 5.5, 6.7, and 8.3 nm. 3%, 6%, 12%, 18%, 24%, 33%, washed 3 to 5 times.
[0026] The particle diameters of the phenolic resin spherical nanoparticles loaded by the present embodiment are 3.7nm, 4.2nm, 5.5nm gold particles, and the catalytic rate reacti...
Embodiment 3
[0027] Example 3: Loading of small gold particles by impregnation method (2)
[0028] The phenolic resin spherical nano-template (prepared from resorcinol) particles in Example 1 were dispersed into the aqueous solution, and the concentration was adjusted to 8 mg / mL. 500 μL of 27 mM chloroauric acid aqueous solution was added to 9 mL of water, and then water was added again, so that the volume of the whole system was 10 mL. Adjust the pH value of the system to 2 or 2.5, keep it in the dark for one hour, add 1 mL of phenolic resin solution, react at room temperature for 15 minutes, and centrifuge to obtain the final product. The size of the obtained small gold particles is 4.3nm, and the gold loading capacity 33%, washed 3 to 5 times.
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