A kind of single-layer hydrotalcite material supported by monodisperse noble metal and its preparation method and application
A precious metal, monodisperse technology, applied in chemical instruments and methods, preparation of imino compounds, metal/metal oxide/metal hydroxide catalysts, etc. Utilize and other problems to achieve the effect of simple preparation method, improved accessibility, improved conversion rate and selectivity
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Embodiment 1
[0025] 1. Take 6mmol Ni(NO 3 ) 2 ·6H 2 O, 2mmol Fe(NO 3 ) 3 9H 2 O and 180 μmol RuCl 3 ·3H 2 O, prepared as solution A in 200ml deionized water.
[0026] 2. Take 20ml formamide and add 180ml water to make solution C.
[0027] 3. Take 1g of NaOH, dissolve it in 100ml of water, and make solution B.
[0028] 4. Drop solution A and solution B into solution C within 30 minutes, and control the pH at about 10.
[0029] 5. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.
[0030] To characterize the catalyst: by figure 1 It can be seen that the monolayer monodisperse noble metal hydrotalcite catalyst synthesized by this method has a particle size of about 20-30 nm and a thickness of about 1 nm, and the synthesized catalyst is a single layer. Depend on figure 2 It can be seen that only th...
Embodiment 2
[0033] 1. Take 10mmol Ni(NO 3 ) 2 ·6H 2 O, 5mmol Al(NO 3 ) 3 9H 2 O and 0.075mmol RuCl 3 ·3H 2 O, prepared as solution A in 40ml deionized water.
[0034] 2. Take 10ml formamide and add 40ml water to make solution C.
[0035] 3. Take 1g of NaOH, dissolve it in 20ml of water, and make solution B.
[0036]4. Drop solution A and solution B into solution C within 20 minutes, and control the pH at about 9.
[0037] 5. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.
[0038] Depend on figure 2 It can be seen that only the Ru-O coordination peak around 1.5 can be seen, but no Ru-Ru coordination peak around 2.7 can be seen, which confirms the monodisperse characteristics of Ru.
[0039] 150 mg of monodisperse noble metal-supported single-layer hydrotalcite material prepared above was used...
Embodiment 3
[0041] 1.7.5mmol Mg(NO 3 ) 2 ·6H 2 O, 2.5mmol Al(NO 3 ) 3 9H 2 O and 0.3mmol RuCl 3 ·3H 2 O, prepared as solution A in 200ml deionized water.
[0042] 2. Take 20ml formamide and add 180ml water to make solution C.
[0043] 3. Take 2g NaOH, dissolve it in 100ml water, and make solution B.
[0044] 4. Drop solution A and solution B into solution C within ten minutes, and keep the pH at about 10.
[0045] 5. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.
[0046] To characterize the catalyst: by figure 1 It can be seen that the monolayer monodisperse noble metal hydrotalcite catalyst synthesized by this method has a particle size of about 20-30 nm and a thickness of about 1 nm, and the synthesized catalyst is a single layer.
[0047] The invention adopts a one-step co-precipitation m...
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