Magnetically-separable mesoporous nano catalyst with core-shell structure and preparation method of magnetically-separable mesoporous nano catalyst
A nano-catalyst, core-shell structure technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of carboxylic acids by ozone oxidation, etc., to solve the effects of poor stability, improve activity, and increase contact area
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Embodiment 1
[0028] Example 1 : Fe 3 o 4 nSiO 2 mSiO 2 Preparation and Application of Ni-Co-B Catalyst
[0029] a. 0.7 g of 20 nm Fe 3 o 4 After the microspheres were ultrasonically treated with dilute hydrochloric acid and washed, a mixture containing 2.5 ml of ammonia water, 140 ml of ethanol, and 35 ml of water was added, placed in an ultrasonic processor and mixed evenly, and finally 1 ml of ethyl orthosilicate was added dropwise, and mechanically stirred 5 h, magnetic separation;
[0030] b, to the Fe prepared above 3 o 4 nSiO 2 Add a mixture containing 0.75 g cetyltrimethylammonium bromide, 2.5 ml ammonia water, 150 ml ethanol, and 200 ml water to the nanoparticles, mix them in an ultrasonic processor, and finally add 1 ml orthosilicone dropwise. Acetate ethyl ester, continue to stir for 5 h, magnetically separate, and wash with ethanol 3-6 times;
[0031] The obtained nanoparticles were mixed with 200 ml ethanol solution of ammonium nitrate with a concentration of 6 g / ml...
Embodiment 2
[0045] Example 2 : Fe 3 o 4 nSiO 2 mZrO 2 Preparation and Application of Ni-Cr-B Catalyst
[0046] a. 0.7 g of 20 nm Fe 3 o 4 After the microspheres were ultrasonically treated with dilute hydrochloric acid and washed, a mixture containing 2.5 ml of ammonia water, 140 ml of ethanol, and 35 ml of water was added, placed in an ultrasonic processor and mixed evenly, and finally 1 ml of ethyl orthosilicate was added dropwise, and the stirring was continued. 5 h, magnetic separation;
[0047] b, to the Fe prepared above 3 o 4 nSiO 2 Add a mixed solution containing 0.45 g cetyltrimethylammonium bromide, 2.3 ml ammonia water, 90 ml ethanol, and 120 ml water to the nanoparticles, mix them in an ultrasonic processor, and finally add 1 ml dropwise at a concentration of 0.92 g / ml zirconium oxychloride aqueous solution, mechanically stirred for 10 h, magnetically separated, washed with ethanol for 3-6 times;
[0048] The obtained nanoparticles were mechanically stirred with 20...
Embodiment 3
[0057] Example 3 : Fe 3 o 4 nSiO 2 mSiO 2 Preparation and Application of Ni-La-B Catalyst
[0058] In this embodiment, steps a and b are the same as those in Embodiment 1.
[0059] c. Add 0.506 g NiCl 2 ·6H 2 O, 0.051 g La(NO 3 ) 3 ·6H 2 O was prepared into a homogeneous solution, and the above-prepared 0.5 g Fe 3 o 4 nSiO 2 mSiO 2 Fully soak in the solution and dry at low temperature;
[0060] d. Add 0.07 g NaOH, 0.46 g KBH 4 Add it to 8.6 ml of water to dissolve and configure it as a reducing agent;
[0061] e. Add c to 4.0 mL water to make a suspension;
[0062] f. Add the solution in d dropwise to e at a speed of 0.7 ml / min through a convection pump. At this time, a black reduced Ni species appears in e. After the dropwise addition of the liquid in d is completed, add the catalyst and The mother liquor was magnetically separated and stored in absolute ethanol for future use.
[0063] application:
[0064] Add 6 g of benzophenone, 0.8 g of catalyst, and ...
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