A kind of porous carbon-supported monomolecular heteropolyacid catalyst and its preparation method and application
A catalyst and porous carbon technology, applied in the field of porous carbon-supported monomolecular heteropolyacid catalyst and its preparation, can solve the problems of limited improvement of catalytic activity and insufficient utilization of active sites, and achieve the effect of excellent catalytic performance
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Embodiment 1
[0058] Embodiment 1: With ribose as carbon source, F127 as surfactant, heteropoly acid uses ammonium molybdate
[0059] Dissolve 1g of surfactant F127 in 10mL of deionized water and stir evenly, then add 0.3g of ammonium molybdate and stir evenly, and finally add 2g of ribose, stir until evenly dispersed; add the mixture to a polytetrafluoroethylene kettle for 8 hours , The reaction temperature is 140°C. The reaction product was centrifuged, washed with water, and repeated three times; washed once with ethanol. A porous carbon-supported monomolecular heteropolyacid catalyst was prepared.
[0060] figure 1 According to the XRD pattern of the porous carbon-supported monomolecular heteropolyacid catalyst prepared in this implementation, it was observed that there were no characteristic peaks of the heteropolyacid molecule on the XRD, indicating that the heteropolyacid was uniformly dispersed on the porous carbon.
[0061] figure 2 The SEM image of the porous carbon-supported...
Embodiment 2
[0072] Embodiment 2: With ribose as carbon source, F127 as surfactant, heteropoly acid uses ammonium molybdate
[0073] Using the same raw materials and preparation process as in Example 1, the only difference is that ammonium molybdate and ribose are added to the surfactant solution at the same time.
[0074] Figure 7 , Figure 8 Scanning electron microscope pictures and transmission electron microscope pictures of the porous carbon-supported monomolecular heteropolyacid catalyst prepared for this example. Observation found that the size of the porous honeycomb structure is about 160 μm, the thickness is about 80 nm, and the diameter of the channel is about 9 nm. dispersion. But its porous honeycomb structure size and thickness are all smaller than the product in Example 1, indicating that its degree of polymerization is not as good as that of Example 1.
Embodiment 3
[0075] Example 3: Using xylose as a carbon source, F108 as a surfactant, and heteropolyacid using phosphotungstic acid
[0076] Dissolve 1g of surfactant F108 in 10mL of deionized water and stir evenly, then add 0.2g of phosphotungstic acid and stir evenly, finally add 3g of xylose, stir until evenly dispersed; add the mixture to a polytetrafluoroethylene kettle for reaction 8h, the reaction temperature is 120°C. The reaction product was centrifuged, washed with water, and repeated three times; washed once with ethanol. A porous carbon-supported monomolecular heteropolyacid catalyst was prepared.
[0077] Figure 9 , Figure 10 Scanning electron microscope pictures and transmission electron microscope pictures of the porous carbon-supported monomolecular heteropolyacid catalyst prepared for this example. It was observed that the size of the porous honeycomb structure is about 190 μm, the thickness is about 110 nm, and the diameter of the channel is about 13 nm. The thickne...
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