Preparation and application of nano-nickel/silver/copper (Ni/Ag/Cu) composite catalyst
A composite catalyst and nano-nickel technology, which is applied in the preparation of organic compounds, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of by-product generation and reduction of the purity of main products, etc. , to avoid the generation of by-products, avoid high temperature and high pressure reactions, and increase the value of profits
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Embodiment 1
[0031] 1. Catalyst preparation:
[0032] In the presence of organic modifier dihydrate bis(p-sulfonylphenyl)phenyl phosphine dipotassium salt, using copper nitrate, silver nitrate, nickel oxalate, hydrazine hydrate, absolute ethanol, etc. as raw materials, through wet Nano-nickel / silver / copper composite catalysts were prepared by combining chemical reduction method and template method. In the first step, at room temperature, 0.1 g of organic modifier was dissolved in 20 mL of absolute ethanol solution and 20 mL of poly(styrene / methacrylic acid) solution were mixed with each other. Under magnetic stirring, 20 mL of copper nitrate (0.05 mol / L) ethanol solution was added dropwise to the above mixture, and stirred for 1 h. 20 mL of hydrazine hydrate aqueous solution (0.05 mol / L) was added dropwise to the above mixture, and reacted at 40 °C for 10 h. In the second step, 20 mL of silver nitrate (0.05 mol / L) was added dropwise to the above mixed solution, and after magnetic stirrin...
Embodiment 2
[0038] Same as in Example 1, only changing the amount of catalyst: 0.01, 0.02, 0.06, 0.1g, to carry out the selective hydrogenation reaction of p-nitrophenol. The product selectivity and raw material conversion rate obtained are shown in Table 1.
[0039] Table 1. At 0.8MP H 2 The reaction temperature is 120 ℃, the reaction is 8h under heat preservation, and the nano-nickel / silver / copper composite catalyst selectively catalyzes the selectivity of p-aminophenol hydrogenation reaction product of p-nitrophenol and the conversion rate of raw materials when the amount of catalyst is different
[0040]
Embodiment 3
[0042] The same as in Example 1, only changing the temperature of the reactor to 80°C, 100°C, 120°C, 140°C, and 160°C to carry out the selective hydrogenation reaction of p-nitrophenol, the results obtained are shown in Table 2.
[0043] Table 2. At 0.8MP H 2 When the amount of catalyst is 0.08 g, at different reaction temperatures, under heat preservation for 8 hours, the nano-nickel / silver / copper composite catalyst selectively catalyzes the selectivity of p-aminophenol hydrogenation reaction product of p-nitrophenol and the conversion rate of raw materials
[0044]
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