A kind of CO low-temperature selective methanation nickel-based catalyst and its preparation method and application
A nickel-based catalyst, selective technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as insufficient activity, achieve good thermal stability, good application prospects, and excellent mass transfer The effect of thermal performance
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Embodiment 1
[0035] (1) Preparation of catalyst carrier Zr-SBA-16: Dissolve 1.4g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (F127) in 70ml of 0.4mol / L HCl solution and stir at 45°C Add 5.2mL of n-butanol and stir for 1h, add 6.71mL tetraethyl orthosilicate (TEOS) and 0.511g zirconium oxychloride (ZrOCl 2 ·8H 2 O) Continue to stir for 20h, then hydrothermally treat at 100°C for 24h, after the product is filtered, washed with water, and dried at 100°C, -1 The heating rate was increased to 550°C for 6 hours in air to remove the template agent, and a white powder was obtained, that is, the catalyst carrier 0.05Zr-SBA-16.
[0036] (2) Take 0.15g Ni(NO 3 ) 2 ·6H 2O was dissolved in 10ml of absolute ethanol to prepare a solution, and 0.3g of the catalyst carrier 0.05Zr-SBA-16 prepared in step (1) was impregnated in the above solution, stirred at room temperature for 12h, evaporated to dryness at 80°C, and dried at 100°C for 12h. Then baked in a muffle furnace at 4...
Embodiment 2
[0039] (1) Preparation of catalyst carrier Zr-SBA-16: same as Example 1.
[0040] (2) Take 0.225g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 10ml of absolute ethanol to prepare a solution, and 0.3g of the catalyst carrier 0.05Zr-SBA-16 prepared in step (1) was impregnated in the above solution, stirred at room temperature for 24h, evaporated to dryness at 90°C, and dried at 100°C for 12h Baked in a muffle furnace at 500 °C for 3 h, in the presence of H 2 30vol% H 2 and N 2 The catalyst was obtained after reduction at 450° C. for 1.5 h in a mixed gas atmosphere. The supported amount of Ni was 15 wt%.
[0041] The results of the CO methanation experiment show that the catalyst prepared in this example can reduce the CO concentration in the outlet gas to below 10ppm in the temperature range of 180-230°C, while maintaining the CH 4 The concentration is lower than 2%, that is, the selectivity is greater than 50%.
Embodiment 3
[0043] (1) Preparation of catalyst carrier Zr-SBA-16: same as Example 1.
[0044] (2) Take 0.3g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 10ml of ethanol to prepare a solution, impregnated 0.3g of the catalyst carrier 0.05Zr-SBA-16 prepared in step (1) into the above solution, stirred at room temperature for 12h, evaporated to dryness at 70°C, dried at 100°C for 12h, and dried at 400°C ℃ in a muffle furnace for 3 hours, in the presence of H 2 30vol% H 2 and N 2 The catalyst was obtained after reduction for 1.5 h at 450° C. under a mixed gas atmosphere. The supported amount of Ni was 20 wt%.
[0045] The results of the CO methanation experiment show that the catalyst prepared in this example can reduce the CO concentration in the outlet gas to below 10ppm in the temperature range of 180-220°C, while maintaining the CH 4 The concentration is lower than 2%, that is, the selectivity is greater than 50%.
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