A kind of regeneration method of deactivated methanation catalyst
A methanation catalyst and catalyst technology, which are applied in the field of methanation reaction, can solve the problems of reduced methanation activity, low recovery rate of precious metals, fast deactivation speed of methane catalyst, etc. Efficient utilization, good activity and thermal stability of
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Embodiment 1
[0024] 1) Sieve the deactivated methanation catalyst to obtain a deactivated methanation catalyst with a regular mechanical structure, place it in an air atmosphere at 450°C for 8 hours to fully burn charcoal, weigh 200g of the methanation catalyst and impregnate it in 5 times The volume of nitric acid solution was dipped at 80°C for 12 hours, the mass percent concentration of the nitric acid solution was 0.8%, and after drying, it was soaked in 8 times the volume of sodium bicarbonate solution at 80°C for 4 hours, the mass of sodium bicarbonate solution The percentage concentration is 15%. After drying, dry at 80°C for 12 hours in an air atmosphere, and roast at 550°C for 4 hours to prepare an activated catalyst carrier. After the acid catalyst is solid in the pickling solution, a pickling metal salt solution is obtained, and the alkali washing solution is alkali After washing the catalyst solid, alkali washing metal salt solution is obtained;
[0025] 2) Filter the above-men...
Embodiment 2
[0027] 1) Sieve the deactivated methanation catalyst to obtain a deactivated methanation catalyst with a regular mechanical structure, place it in an air atmosphere at 500°C for 6 hours to fully burn charcoal, weigh 200g of the methanation catalyst and impregnate it in 5 times Immerse in a volume of oxalic acid solution at 80°C for 12 hours. The mass percent concentration of the oxalic acid solution is 1.0%. The percentage concentration is 15%. After drying, dry at 80°C for 12 hours in an air atmosphere, and roast at 550°C for 6h to prepare an activated catalyst carrier;
[0028] 2) The metal salt solution after the above-mentioned pickling and alkali cleaning is filtered respectively to remove solid impurity particles, and 990g of nickel nitrate and 360g of magnesium nitrate are dissolved in the pickling solution to make a regeneration solution, and the above-mentioned alkali cleaning solution 1.45 L. Adjust the regeneration solution to pH = 7.5, soak the above-mentioned acti...
Embodiment 3
[0030] 1) Sieve the deactivated methanation catalyst to obtain a deactivated methanation catalyst with a regular mechanical structure, place it in an air atmosphere at 500°C for 8 hours to fully burn charcoal, weigh 200g of the methanation catalyst and impregnate it in 5 times Soak in citric acid solution of 10 volumes at 80°C for 24 hours, the concentration of citric acid solution is 1.2%, after drying, soak at 80°C for 4 hours in 10 times the volume of ammonium bicarbonate solution, the concentration of ammonium bicarbonate solution is 12%, dried in the air atmosphere at 80°C for 12 hours, and roasted at 550°C for 4 hours to prepare an activated catalyst carrier. After the acid catalyst solid in the pickling solution, pickling metal salt solution was obtained. Obtain alkali washing metal salt solution;
[0031]2) Filter the above-mentioned pickling metal salt solution and alkali-washing metal salt solution respectively to remove solid impurity particles, and take 930g of nic...
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