A preparation method of "selective/non-selective" tunable Ni-based catalyst
A non-selective and catalytic technology, applied in the new field of catalysis, can solve the problems such as the inability to directly realize the selectivity and adjustable catalytic process, and achieve the effects of large-scale industrial production, easy large-scale industrial production, and easy preparation
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Embodiment 1
[0034] Dissolve the substrate p-nitroaniline (0.5mmol) and the active component precursor nickel nitrate (0.25mmol) in dimethyl sulfoxide (10mL), after ultrasonic dispersion and compounding for 25 minutes, add the functional monomer 7-octyl Acrylic acid (1.0mmol), cross-linking agent N, N methylenebisacrylamide (3.5mmol) and initiator azobisisobutyronitrile (0.1g), then nitrogen deoxygenation into the solution for 8 minutes, sealed and placed Irradiation under ultraviolet light initiates polymerization (24 hours) to form a catalyst precursor. The Ni ions in the catalyst precursor were reduced by an excessive amount of sodium borohydride (2.5mmol), and the obtained product was washed with water repeatedly after the imprinted p-nitroaniline was eluted with a mixed solution of ethanol (90vol-%)-acetic acid (10vol-%), and vacuum Drying to obtain a Ni-based catalyst with adjustable selectivity (see the technical principle of figure 1 ; labeled "MIP-Ni-NA-L", where MIP is the impri...
Embodiment 2
[0041] Operated with Example 1, the long-chain functional monomer was changed from 7-octenoic acid to 6-heptenoic acid (1.0mmol), and the others were completely operated with Example 1 to obtain a Ni base with a phase transition point of about 39°C. Catalyst MIP-Ni-NA-L. Under the same catalytic test conditions as in Example 1, select 35 and 45°C higher and lower than the phase transition point for comparative measurement, the results are shown in Figure 8 . At 35°C, the prepared MIP-Ni-NA-L catalyst showed selective catalytic effect on the specific substrate p-nitroaniline; in contrast, at 45°C, MIP-Ni-NA -L shows no selectivity for the specific substrate p-nitroaniline and its analog m-nitroaniline. The prepared MIP-Ni-NA-L catalyst also exhibits the characteristics of "selective / non-selective" tunable catalysis.
Embodiment 3
[0043] The operation was the same as in Example 1, except that the specific substrate was changed to o-nitroaniline, and the other preparations were exactly the same as in Example 1 to obtain a Ni-based catalyst MIP-Ni-NA-L with a phase transition point of about 37°C. Under the same catalytic test conditions as in Example 1, the catalytic test substrate is changed to the specific substrate o-nitroaniline and analog m-nitroaniline, and the temperature is selected to be higher than and lower than the phase transition point at 25 and 40°C. For comparison, the results can be seen in Figure 9 . At 25 °C, the prepared MIP-Ni-NA-L catalyst exhibited selective catalytic effects on the specific substrate o-nitroaniline; in contrast, at 40 °C, MIP-Ni-NA -L shows no selectivity for the specific substrate o-nitroaniline and its analog m-nitroaniline. The prepared MIP-Ni-NA-L catalyst also exhibits the characteristics of "selective / non-selective" tunable catalysis.
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