Regeneration method for modified zeolite molecular sieve amination catalyst
A modified zeolite and catalyst technology, applied in molecular sieve catalysts, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., to achieve the effect of solving carbon deactivation, reducing diffusion resistance, and prolonging service life
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Embodiment 1
[0027] 1. Modified zeolite molecular sieve amination catalyst regeneration treatment method
[0028] a) Add the deactivated modified zeolite molecular sieve amination catalyst into deionized water according to the solid-to-liquid ratio of 1:4, slowly add an appropriate amount of citric acid under strong stirring until the pH value of the reaction suspension reaches 4-5, and heat to reflux 2h, filter, wash to neutral, and dry.
[0029] b) The coke-dissolving modified zeolite molecular sieve amination catalyst obtained in step a) is used at 260° C. 2 / O 2 The mixed gas is used for low-temperature charcoal regeneration, and the exothermic temperature difference in the process of regeneration charcoal is controlled to be ≤5°C until no CO is detected in the reaction tail gas. 2 generated, the temperature is raised to 400°C to continue to use N 2 / O 2 The mixed gas is used for high-temperature charcoal regeneration, and the exothermic temperature difference in the regeneration c...
Embodiment 2
[0037] 1. Modified zeolite molecular sieve amination catalyst regeneration treatment method
[0038] a) Add the deactivated modified zeolite molecular sieve amination catalyst into deionized water according to the solid-to-liquid ratio of 1:4, slowly add an appropriate amount of oxalic acid under strong stirring until the pH value of the reaction suspension is 4-5, heat and reflux for 2 hours , filtered, washed to neutral, and dried.
[0039] b) The coke-dissolving modified zeolite molecular sieve amination catalyst obtained in step a) is regenerated at 260° C. using a mixed gas of N2 / O2 to burn charcoal at a low temperature, and control the exothermic temperature difference in the process of regenerated charcoal ≤ 5° C. to No CO detected in the reaction tail gas 2 generated, the temperature is raised to 400°C to continue to use N 2 / O 2 The mixed gas is used for high-temperature charcoal regeneration, and the exothermic temperature difference in the regeneration charcoal b...
Embodiment 3
[0047] 1. Modified zeolite molecular sieve amination catalyst regeneration treatment method
[0048] a) Add the deactivated modified zeolite molecular sieve amination catalyst into deionized water according to the solid-to-liquid ratio of 1:4, slowly add an appropriate amount of malic acid under vigorous stirring until the pH value of the reaction suspension reaches 4-5, and heat to reflux 2h, filter, wash to neutral, and dry.
[0049] b) The coke-dissolving modified zeolite molecular sieve amination catalyst obtained in step a) is used at 260° C. 2 / O 2 The mixed gas is used for low-temperature charcoal regeneration, and the exothermic temperature difference in the process of regeneration charcoal is controlled to be ≤5°C until no CO is detected in the reaction tail gas. 2 generated, the temperature is raised to 400°C to continue to use N 2 / O 2 The mixed gas is used for high-temperature charcoal regeneration, and the exothermic temperature difference in the regeneration ...
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