Metal modification ZSM-5 molecular sieve based catalyst and preparation method and application
A ZSM-5, metal modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large acidity drop of molecular sieves, blockage of molecular sieve channels, high reaction temperature, etc., and achieve the modification effect Good, reduce energy consumption, improve the effect of selectivity
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[0051] Example 1
[0052] Dissolve 30g of lanthanum nitrate in 400ml of water to prepare a solution, slowly add the solution dropwise to 200g of HZSM-5 with a silicon-to-aluminum ratio of 28, fully stir for 2h, transfer the solid-liquid mixture to a high-temperature reactor at 140°C After reacting for 12 hours, the reaction vessel was taken out, cooled to room temperature in air, the lid of the reaction vessel was opened, and dried at 100° C. for 10 hours to obtain catalyst powder. The catalyst was compressed into tablets at 20Mpa, and particles of 40-80 mesh were sieved to obtain a catalyst for evaluation. The XRD pattern of the product is as follows figure 2 As shown, the product electron microscope photos are as image 3 Shown.
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[0053] Example 2
[0054] Dissolve 30g of cerium chloride into 400ml of water and oxalic acid mixture (water: oxalic acid=4:1) to prepare a solution, and slowly drop the solution into 200g of HZSM-5 with a silicon-to-aluminum ratio of 38. After stirring for 2 hours, the solid-liquid mixture was transferred to a high-temperature reaction vessel, reacted at 140°C for 14 hours, then the reaction vessel was taken out, cooled to room temperature in air, the reaction vessel cover was opened, and dried at 100°C for 10 hours to obtain catalyst powder. The catalyst was compressed into tablets at 20Mpa, and particles of 40-80 mesh were sieved to obtain a catalyst for evaluation.
Example Embodiment
[0055] Example 3
[0056] Dissolve 25g of cerium nitrate into 400ml of water and citric acid mixture (water:citric acid mass ratio is 10:1) to prepare a solution, slowly drop this solution into 200g of HZSM-5 with a silicon to aluminum ratio of 180, and stir thoroughly 2h, transfer the solid-liquid mixture to a high-temperature reactor, react at 180°C for 12h, take out the reactor, cool to room temperature in air, open the lid of the reactor, and dry at 100°C for 10h to obtain catalyst powder. The catalyst was compressed into tablets at 20Mpa, and particles of 40-80 mesh were sieved to obtain a catalyst for evaluation.
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