Heterogeneous catalyst for preparing 3, 5-dimethylphenol from isophorone as well as preparation method and application of heterogeneous catalyst
A heterogeneous catalyst, dimethyl phenol technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of non-recyclable, etc., to solve the problem of separation and recycling, High conversion rate and selectivity, and the effect of reducing input costs
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Embodiment 1
[0049] Preparation of catalyst:
[0050] According to the mass ratio of 4:3:4:10:3000, the cobalt salt Co(NO 3 ) 2 ·6H 2 O, nickel salt Ni(NO 3 ) 2 ·6H 2 O. Trimellitic acid and 2-methylimidazole were dissolved in DMF. After they were completely dissolved, they were placed in a 170°C hydrothermal kettle and placed in an oven for hydrothermal reaction. The reaction time was 22 hours. After the reaction, centrifuged to obtain a precipitate ; Wash the precipitate with ethanol for 5 times and dry it in a vacuum oven with a vacuum degree of 50KPa at 90°C for 8h to obtain CoNi-MOFs;
[0051] CoNi-MOFs were placed in a tube furnace, calcined at 800 °C for 2 h in a nitrogen atmosphere, the heating rate was 2 °C / min, and the nitrogen flow rate was 45 mL / min, and carbonized to obtain Co-Ni-NiO-Co 3 o 4 / CN, where Co content is 0.76%, Ni content is 0.66%, NiO content is 4.5%, Co 3 o 4 The content is 12.8%, and the remaining components are CN.
[0052] The catalyst is cubic, wit...
Embodiment 2
[0058] Preparation of catalyst:
[0059] According to the mass ratio of 3:4:4:10:3500, the cobalt salt Co(NO 3 ) 2 ·6H 2 O, nickel salt NiCl 2 ·6H 2 O. Trimellitic acid and 2-methylimidazole are dissolved in DMF. After they are completely dissolved, they are placed in a hydrothermal kettle at 190°C and placed in an oven for hydrothermal reaction. The reaction time is 20 hours. After the reaction, centrifuge to obtain a precipitate ; Wash the precipitate with ethanol for 5 times and dry it in a vacuum oven with a vacuum degree of 30KPa at 80°C for 10h to obtain CoNi-MOFs;
[0060] CoNi-MOFs were placed in a tube furnace, calcined at 750 °C for 1 h in a nitrogen atmosphere, the heating rate was 2.5 °C / min, and the nitrogen flow rate was 45 mL / min, and carbonized to obtain Co / Ni / NiO / Co 3 o 4 / CN, where Co content is 0.55%, Ni content is 0.77%, NiO content is 4.1%, Co 3 o 4 The content is 12%, and the remaining components are CN.
[0061] The morphology of the catalyst is...
Embodiment 3
[0067] Preparation of catalyst:
[0068] According to the mass ratio of 5:3:3:10:2500, the cobalt salt CoCl 2 ·6H 2 O, nickel salt Ni(NO 3 ) 2 ·6H 2 O. Trimellitic acid and 2-methylimidazole were dissolved in DMF. After they were completely dissolved, they were placed in a 160°C hydrothermal kettle and placed in an oven for hydrothermal reaction. The reaction time was 18 hours. After the reaction, centrifuged to obtain a precipitate ; Wash the precipitate with ethanol for 5 times and dry it in a vacuum oven with a vacuum degree of 40KPa at 90°C for 6h to obtain CoNi-MOFs;
[0069] CoNi-MOFs were placed in a tube furnace and calcined at 700 °C for 3 h in a nitrogen atmosphere with a heating rate of 3 °C / min and a nitrogen flow rate of 35 mL / min to obtain Co / Ni / NiO / Co 3 o 4 / CN, where Co content is 0.88%, Ni content is 0.57%, NiO content is 5.3%, Co 3 o 4 The content is 13.4%, and the remaining components are CN.
[0070] The morphology of the catalyst is cubic, with an...
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