A nitrogen-doped carbon material-supported cobalt catalyst and its preparation method and application in reductive amination of aldehyde compounds
A technology of aldehyde compounds and cobalt catalysts, which is applied in the direction of catalyst activation/preparation, preparation of organic compounds, chemical instruments and methods, etc., and can solve the difficulties of recycling and reusing homogeneous catalysts, polluting target products, catalyst instability, etc. problems, achieve good industrial application prospects, reduce reaction temperature, and reduce production costs
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Embodiment 1
[0053] A nitrogen-doped carbon material supported cobalt catalyst, prepared by the following method:
[0054] (1) First, disperse 0.01mol o-phenylenediamine (OPDA) in 100mL distilled water to form a homogeneous OPDA solution, and then add 10mmol Co(NO 3 ) 2 ·6H 2 O, stirred at room temperature for 4h to form a uniform Co-OPDA complex solution;
[0055] (2) Add 1-2 drops of 1mol / L HNO to the above homogeneous Co-OPDA complex solution 3 solution to make the solution pH = 6-7; after that, add 5mL of 40wt.% colloidal silicon dioxide to the above acidic Co-OPDA complex solution, and vigorously stir for 2h to obtain a uniform suspension;
[0056] (3) Then slowly add 20mLH to the suspension 2 o 2 (30wt.%) solution, carry out polymerization to form the polymer of Co-PPDA, H 2 o 2 The solution was added in 30 minutes, and the newly prepared 1mol / L NaHCO was added to it during the dropwise addition. 3 The solution keeps the pH value of the whole system at 6-7, H 2 o 2 After th...
Embodiment 2
[0059] The operation and steps were the same as in Example 1, except that the target pyrolysis temperature was changed to 600° C. to obtain a nitrogen-doped carbon material supported cobalt catalyst: Co@CN-600.
Embodiment 3
[0061] The operation and steps were the same as those in Example 1, except that the target pyrolysis temperature was changed to 900° C. to obtain a nitrogen-doped carbon material-supported cobalt catalyst: Co@CN-900.
[0062] The catalyst of the nitrogen-doped carbon material loaded cobalt prepared in embodiment 1-3 is scanned with a transmission electron microscope (TEM), and the transmission electron microscope collection of spectra of gained is as follows figure 2 as shown ( figure 2 a-c are the TEM images of Co@CN-600, Co@CN-800 and Co@CN-900, respectively, figure 2 d-f are the particle size distribution diagrams corresponding to Co@CN-600, Co@CN-800 and Co@CN-900 respectively), from figure 2 can be found in:
[0063] Such as figure 2 a. figure 2 b. figure 2 As shown in c, cobalt nanoparticles are clearly observed on the surface of the nitrogen-doped carbon material. In addition, the porous structure of the sample was also clearly observed; and because the cob...
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