A modified catalyst and its preparation method
A technology of catalysts and supported catalysts, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve problems such as complex methods and inconsistencies, and achieve simple and convenient methods, improve hydrophobicity, and increase activity. Effect
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[0034] The present invention also provides a method for preparing a modified catalyst, comprising: A) heating the catalyst and cured polydimethylsiloxane in the same container without contacting each other under vacuum conditions to obtain a modified catalyst; The heating temperature is greater than or equal to 200°C; the catalyst is a catalyst with stable performance under the condition of greater than or equal to 200°C.
[0035] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available. The catalyst is the same as described above, and will not be repeated here.
[0036] The cured polydimethylsiloxane is preferably prepared according to the following method: mixing polydimethylsiloxane with a curing agent, heating, and cooling to obtain cured polydimethylsiloxane. Wherein, the curing agent is a curing agent well known to those skilled in the art; the mass ratio of the polydimethylsiloxane to the curin...
Embodiment 1
[0045] The catalyst used in this example is a catalyst in which metal palladium is supported on metal-organic framework material UiO-66, Pd / UiO-66.
[0046] 1.1 Dissolve 0.53g of zirconium tetrachloride and 0.34g of terephthalic acid in 31.25mL of N,N-dimethylformamide (DMF), add it to a 50mL reactor, and react at 120°C for 24 hours. Cool to room temperature. The solid was collected by filtration, rinsed three times with DMF, once with acetone, and soaked in chloroform for five days. Finally, the UiO-66 solid was obtained by filtration, and the activated UiO-66 was obtained overnight at 190° C. under vacuum.
[0047] 1.2 Ultrasonic dispersion of 200 mg of activated UiO-66 in 20 mL of DMF, 2 mL of Pd(NO 3 ) 2 2H 2 O in DMF was added dropwise to the above solution. Then stirred for 24 hours, filtered, rinsed with DMF three times, and dried at 85°C. Dissolve the solid in 20% H 2 / Ar mixed gas at 200°C for 4 hours to obtain the catalyst Pd / UiO-66.
[0048] 1.3 To cure PDMS...
Embodiment 2
[0057] The catalyst used in this example is the catalyst of metal palladium supported on commercial silica, Pd / SiO 2 .
[0058] 2.1 will contain 2.5mg of Pd(NO 3 ) 2 2H 2 O was added dropwise to 100 mg of SiO 2 For solids, the solids were ground for 30 minutes and then dried at 60°C for 12 hours. Dissolve the solid in 20% H 2 / Ar mixed gas at 200°C for 4 hours to obtain the catalyst Pd / SiO 2 .
[0059] 2.2 Curing PDMS: Weigh 10g of PDMS and 1g of supporting curing agent respectively, stir vigorously for 15 minutes, heat in a 180°C drying oven for 2 hours, and cut into small pieces for later use after cooling.
[0060] 2.3 Weigh 30mg of the catalyst Pd / SiO obtained in 2.1 2 Spread it flat in a glass petri dish, put it into the bottom of the desiccator, and put four pieces of cured PDMS (3g in total) thin slices obtained in 2.2 on the outside of the petri dish, heat to 200°C for 60 minutes after vacuum sealing the desiccator, Naturally lowered to room temperature to obt...
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