Method for preparing ester by catalytic oxidization of 1,3-propanediol
A technology for catalytic oxidation and propylene glycol, applied in the direction of catalyst activation/preparation, chemical instruments and methods, and preparation of organic compounds, which can solve the problem of low reaction rate and achieve high selectivity
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Embodiment 1
[0021] Embodiment 1 hydrothermal method prepares nanometer ceria of different shapes
[0022] Add 24 grams (or 0.4 grams) of sodium hydroxide and 1.95 grams of cerium nitrate into the reactor, conduct a hydrothermal reaction at 100-180°C for 24 hours, filter and wash until neutral. Dry at 80°C for 12 hours, and bake at 100-1000°C for 4 hours. respectively get CeO 2 Nano-cube, nano-rod and nano-polyhedron carrier, the above-mentioned catalyst carrier is made into 40-60 mesh particles for future use.
Embodiment 2
[0023] Embodiment 2 deposition-precipitation method prepares the catalyst of loading 1%Au (Pd)
[0024] One of urea, sodium carbonate or sodium hydroxide is added to the gold chloride (Pd metal) solution so that the molar ratio is 1:100, and deionized water and oxide carrier are added so that the precious metal:carrier mass ratio is 1 : 100, placed in a water bath at 70-100°C for 2-4h, then the mixture was washed, filtered with suction, and dried. That is, the test catalyst was obtained.
Embodiment 3
[0025] Embodiment 3 prepares Au colloid
[0026] 100μg / mlHAuCl 4 The aqueous solution was added dropwise with 2wt% PVA (M=10000) aqueous solution (PVA / Au(wt / wt)=0.62) under stirring, then stirred for 10min, and then added dropwise with 0.1M freshly prepared NaBH 4 Solution (NaBH 4 / Au (mol / mol)=4), that is, Au colloid is obtained.
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