Preparation method for preparing synthesis gas NiO@SiO2 core-shell type catalyst by employing low-concentration coalbed methane
A technology for synthesis gas and coalbed methane, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., which can solve the difficulty in controlling the particle size of precious metal nanoparticles and the complicated operation process. And other issues
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Embodiment approach 1
[0028]Catalyst preparation: Weigh 2.1g of soluble metallic nickel salt and 10.7g of polyvinylpyrrolidone, and dissolve them in 100ml of pentanediol solution. in N 2 Under protection, the above solution was heated to 200° C. and stirred at this temperature for 4 h, then the solution was further heated to 270° C., stirred for 1 h, and cooled to room temperature. 100 ml of acetone solution was added to obtain a precipitate, which was centrifuged and washed with ethanol, and the obtained nanoparticles were dispersed in 100 ml of ethanol. Take 100ml of the ethanol solution in which the nanoparticles were dispersed in the previous step, add 1g of polyvinylpyrrolidone to the solution, and stir at room temperature for 12h. Add 10ml of ammonia solution to the above solution and place it in an ultrasonic oscillator for 30min. Add 0.1ml tetraethyl orthosilicate and 5ml ethanol solution to the above solution, and continue ultrasonic oscillation for 1h. The product was collected by cent...
Embodiment approach 2
[0034] Catalyst preparation:
[0035] Weigh 4.3g soluble metal nickel salt, 16g polyvinylpyrrolidone, and dissolve it in 100ml pentanediol solution. in N 2 Under protection, the above solution was heated to 170° C. and stirred at this temperature for 2.5 h, then the solution was further heated to 200° C., stirred for 1.5 h, and cooled to room temperature. 150ml of acetone solution was added to obtain a precipitate, which was centrifuged and washed with ethanol, and the obtained nanoparticles were dispersed in 200ml of ethanol. Take 100ml of the ethanol solution in which the nanoparticles were dispersed in the previous step, add 1.6g of polyvinylpyrrolidone to the solution, and stir at room temperature for 12h. Add 17ml of ammonia solution to the above solution and place it in an ultrasonic oscillator for 30min. Add 0.5ml tetraethyl orthosilicate and 10ml ethanol solution to the above solution, and continue ultrasonic oscillation for 1h. The product was collected by centrif...
Embodiment approach 3
[0041] Catalyst preparation: reference example 1;
[0042] Catalytic performance evaluation: The catalytic reaction was carried out in a fixed-bed reactor. Before the reaction, the catalyst was first heated at 750°C with H 2 Reduction for 2h; then feed the raw material gas, which forms CH 4 / O 2 / N 2 2 / 1 / 2 (molar ratio), normal pressure, reaction temperature 750°C, constant space velocity of 1×10 5 ml·h -1 g -1 , The product was analyzed by gas chromatography after condensing to remove water. The experimental results of Example 3 are shown in Table 3.
[0043] Table 3 NiOSiO 2 Catalytic Performance of Catalysts at Different Space Velocities
[0044] time (h) Methane conversion rate (%) CO selectivity (%) h 2 selectivity (%) h 2 / CO 0 0.75 0.76 0.61 1.6 1 0.83 0.79 0.64 1.63 2 0.86 0.81 0.67 1.65 3 0.87 0.83 0.67 1.62 4 0.88 0.83 0.67 1.68 5 0.88 0.85 0.7 1.62 6 0.89 0.85 0.7 1.65 18 0.87 ...
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