Hydroxyapatite-based catalyst as well as preparation and application thereof
A hydroxyapatite and catalyst technology, which is applied in the preparation of carbon-based compounds, organic compounds, physical/chemical process catalysts, etc., can solve the problems of complex reaction process and catalytic system, and achieve good hydrothermal stability, Good stability, simple, controllable and easy-to-operate reaction process
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Embodiment 1
[0036] Will (NH 4 ) 2 HPO 4 Dissolve in deionized water to form a 0.04g / mL aqueous solution, denoted as A solution, Ca(NO 3 ) 3 4H 2 O was dissolved in deionized water to form 0.13g / mL deionized water, and PEG2000 was added (concentration: 10mg / mL), which was recorded as B solution. The pH of A and B solutions was adjusted to 10 with mass fraction of 28% ammonia respectively, and A solution was added dropwise to B solution through a convection pump at a rate of 1mL / min; the volume ratio of A and B solutions was 2: 1; Then the resulting precipitate was heated in an oil bath at 50°C for 10 minutes, filtered with suction, fully washed until neutral, dried at 120°C, and finally calcined in a muffle furnace at 400°C for 3 hours. The obtained sample is hydroxyapatite (marked as HAP-1).
[0037] Disperse the prepared HAP-1 in an aqueous solution (0.05g / mL), then add 0.1mol / L lithium nitrate, conduct ion exchange at 25°C for 2 hours, after ion exchange, filter, wash, and place t...
Embodiment 2
[0040] Will (NH 4 ) 2 HPO 4 Dissolve in deionized water to form a 0.2g / mL aqueous solution, denoted as A solution, Ca(NO 3 ) 3 4H 2O was dissolved in deionized water to form 0.33g / mL deionized water, and PEG6000 (concentration: 20mg / mL) was added, which was recorded as B solution. The pH of the A and B solutions was adjusted to 11 with mass fraction of 28% ammonia respectively, and the A solution was added dropwise to the B solution through an advection pump at a rate of 5 mL / min; the volume ratio of the A and B solutions was 1: 1; Then the resulting precipitate was heated in an oil bath at 70°C for 30 minutes, filtered with suction, fully washed until neutral, dried at 120°C, and finally calcined in a muffle furnace at 600°C for 6 hours. The obtained sample is hydroxyapatite (marked as HAP-2).
[0041] Disperse the prepared HAP-1 in an aqueous solution (0.1g / mL), then add 0.5mol / L sodium nitrate, conduct ion exchange at 65°C for 12 hours, after ion exchange, filter, was...
Embodiment 3
[0044] Will (NH 4 ) 2 HPO 4 Dissolve in deionized water to form a 0.4g / mL aqueous solution, denoted as A solution, Ca(NO 3 ) 3 4H 2 O was dissolved in deionized water to form 0.65g / mL deionized water, and PEG6000 (concentration: 40mg / mL) was added, which was recorded as B solution. The pH of A and B solutions was adjusted to 11 with mass fraction of 28% ammonia respectively, and A solution was added dropwise to B solution through a convection pump at a rate of 10 mL / min; the volume ratio of A and B solutions was 1: 2; Then the resulting precipitate was heated in an oil bath at 90°C for 60 minutes, filtered with suction, washed until neutral, dried at 120°C, and finally calcined in a muffle furnace at 700°C for 12 hours. The resulting sample is hydroxyapatite (marked as HAP-3).
[0045] Disperse the prepared HAP-1 in an aqueous solution (0.2g / mL), then add 0.9mol / L potassium nitrate, conduct ion exchange at 85°C for 24 hours, after ion exchange, filter, wash, and dry the ...
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