A kind of nitriding molten iron catalyst and its preparation method and application
A molten iron catalyst, nitriding molten iron technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve uneven nitriding, easy carbon deposition and deactivation, and poor stability etc. to achieve high activity, uniform distribution, and improved mechanical strength and stability
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Embodiment 1
[0038] The present embodiment provides a kind of nitriding molten iron catalyst, and its preparation method is as follows:
[0039] 100g of magnetite was ultrasonically cleaned with absolute ethanol for 5 minutes, and then cleaned with deionized water to obtain a powder for later use;
[0040] 0.45g Co powder, 0.9g MnO, 1.0g CuO, 1.8g K 2 CO 3 , 1.1g Al 2 o 3 , 1.3g SiO 2 Mix it with magnetite; Grind it in a ball mill for 2 hours, and put the powder in a vacuum melting furnace, heat up and melt it to 1650°C;
[0041]Then pour the molten slurry into the cooling plate (at a rate of 300°C / min) to cool down to 500°C and then move it into liquid nitrogen for rapid cooling to -50°C ~ -40°C to maintain a reasonable internal stress, then break and Grind the angle in the angle grinding machine for 1 hour, and finally sieve to 0.3-0.5mm.
[0042] after H 2 / N 2 (The volume ratio of the two is 20:80) Reduction at 500°C in air for 4 hours, and then NH 3 Nitriding at 400°C for 6 h...
Embodiment 2
[0047] The present embodiment provides a kind of nitriding molten iron catalyst, and its preparation method is as follows:
[0048] 100g of magnetite was ultrasonically cleaned with absolute ethanol for 5 minutes, and then cleaned with deionized water to obtain a powder for later use;
[0049] 1g Al 2 o 3 , 0.3g La 2 o 3 , 0.45g CeO 2 , 3.3g K 2 CO 3 , 2g SiO 2 Mix with magnetite; Grind in a ball mill for 2 hours to obtain a powder in a vacuum melting furnace, heat up and melt to reach 1650°C;
[0050] Then pour the molten slurry into the cooling plate (at a rate of 250°C / min) to cool down to 500°C and then move it into liquid nitrogen for rapid cooling to maintain a reasonable internal stress, then break it and grind the angle in the angle grinder for 1 hour , and finally sieved to 0.3-0.5mm.
[0051] after H 2 / N 2 (The volume ratio of the two is 20:80) Reduction at 500°C in air for 4 hours, and then NH 3 Nitriding at 300°C for 10 hours, and the nitriding molten ...
Embodiment 3
[0057] The present embodiment provides a kind of nitriding molten iron catalyst, and its preparation method is as follows:
[0058] 100g of magnetite was ultrasonically cleaned with absolute ethanol for 5 minutes, and then cleaned with deionized water to obtain a powder for later use;
[0059] 2g Al 2 o 3 , 0.8g ZrO 2 , 0.6g Cr 2 o 3 , 0.2g Au, 1.6g K 2 CO 3 , 1.2g SiO 2 Mix with magnetite; Grind in a ball mill for 2 hours to obtain a powder in a vacuum melting furnace, heat up and melt to reach 1650°C;
[0060] Then pour the molten slurry into the cooling plate (at a rate of 300°C / min) to cool down to 500°C and then move it into liquid nitrogen for rapid cooling to maintain a reasonable internal stress, then crush it, and grind the angle in the angle grinder for 1 hour , and finally sieved to 1-3mm.
[0061] after H 2 / N 2 (The volume ratio of the two is 20:80) Reduction at 500°C in air for 4 hours, and then NH 3 Nitriding at 550°C for 3 hours, and the nitriding m...
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