Magnetic core-shell nanocatalyst, preparation method thereof and application thereof in catalyzing 5-hydroxymethylfurfural to prepare 2, 5-diformyl furan
A diformyl furan and nano-catalyst technology, applied in the direction of physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, chemical instruments and methods, etc., can solve the problems of high price and high toxicity, and achieve Not easy to deactivate, easy to operate, easy to recycle and reuse
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Embodiment 1
[0042] A magnetic core-shell nanosphere Fe 3 o 4 @SiO 2 -NH 2 Load VO separately 2+ and Cu 2+ The preparation method of catalyst, its step is as follows:
[0043] 1. Fe 3 o 4 Preparation of nanomaterials:
[0044] FeCl 3 ·6H 2 O (1.08g) was dissolved in 20ml of ethylene glycol, stirred for 0.5h until clear, then stirred for 1h; added 0.25g of sodium citrate, stirred for 5h, transferred to a 50ml hydrothermal synthesis reactor, heated to 200°C, and kept 10h, then cooled to room temperature; the black product was recovered with a magnet, washed with ethanol and deionized water for 6 times, and then vacuum-dried at 50°C for 12h to obtain nano-Fe 3 o 4 .
[0045] 2. Fe 3 o 4 @SiO 2 Preparation of Magnetic Nanomaterials:
[0046] Get the nano-Fe that step 1 makes 3 o 4 (0.5g) was dispersed in the mixture (80ml ethanol and 20ml deionized water) for ultrasonic treatment, and then 5ml of NH 3 ·H 2 O and 4ml of TEOS (tetraethyl orthosilicate) with a mass fraction of...
Embodiment 2
[0054] 1) Fe 3 o 4 @SiO 2 -NH 2 -VO 2+ Preparation of catalyst: get 0.5g of Fe 3 o 4 @SiO 2 -NH 2 with 0.25gVOSO 4 Add 25ml of methanol, heat and stir in a water bath at 55°C for 12 hours, filter and wash with ethanol, then Soxhlet extraction for 12 hours, and then vacuum-dry to obtain a magnetic core-shell nanocatalyst, marked as Fe 3 o 4 @SiO 2 -NH 2 -VO 2+ ;
[0055] 2) Fe 3 o 4 @SiO 2 -NH 2 -Cu 2+ Catalyst preparation: take 0.5g Fe 3 o 4 @SiO 2 -NH 2 with 0.25g CuSO 4 Add 25ml of methanol, heat and stir in a water bath at 50°C for 18 hours, filter and wash with ethanol, then Soxhlet extraction for 18 hours, and then vacuum-dry to obtain a magnetic core-shell nanocatalyst, marked as Fe 3 o 4 @SiO 2 -NH 2 -Cu 2+ .
Embodiment 3
[0057] 1) Fe 3 o 4 @SiO 2 -NH 2 -VO 2+ Catalyst preparation: take 1.5gFe 3 o 4 @SiO 2 -NH 2 with 0.75gVOSO 4 Add 75ml of methanol, heat and stir in 85°C water bath for 36h, filter and wash with ethanol, then Soxhlet extraction for 36h, and then vacuum dry to obtain the magnetic core-shell nanocatalyst, marked as Fe 3 o 4 @SiO 2 -NH 2 -VO 2+ ;
[0058] 2) Fe 3 o 4 @SiO 2 -NH 2 -Cu 2+ Catalyst preparation: get 1.5g Fe 3 o 4 @SiO 2 -NH 2 with 0.75g CuSO 4 Add 75ml of methanol, heat and stir in a water bath at 90°C for 30 hours, filter and wash with ethanol, then Soxhlet extraction for 30 hours, and then vacuum-dry to obtain a magnetic core-shell nanocatalyst, marked as Fe 3 o 4 @SiO 2 -NH 2 -Cu 2+ .
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