Preparation method and application of a molecular sieve catalyst containing aluminum phosphate binder
A molecular sieve and binder technology, which is applied in the field of preparation of molecular sieve catalysts, can solve problems such as researches that have not yet been published, and achieve the effect of improving conversion rate and good anti-carbon deposition performance
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Embodiment 1
[0030] A certain amount of rare earth ZSM-11 molecular sieve with a particle size of 350nm (the rare earth content accounts for 1.2wt% of the rare earth ZSM-11 molecular sieve) is calcined at 550°C for 4h to remove the stencil agent, and 0.8mol / L ammonium nitrate is used at 80°C Solution exchange 3 times, water wash 2 times, 120°C drying, 540°C roasting for 3 hours to obtain H-type molecular sieve, then conventionally impregnated loaded zinc metal, using zinc nitrate solution, drying at 85°C for 2 hours, 550°C roasting for 4 hours, the resulting catalyst The Zn loading is 5wt%; the phosphoric acid solution and the boehmite are in accordance with the P / Al molar ratio (the molar ratio of P element in the phosphoric acid solution to the Al element in the boehmite, the same below), stir evenly, and add to the previous preparation For a good molecular sieve catalyst, the weight ratio of molecular sieve dry basis to boehmite dry basis is 4, stirred uniformly, dried at 125°C and calcin...
Embodiment 2
[0032] A certain amount of 500nm rare earth ZSM-11 molecular sieve (the rare earth content accounts for 2.3wt% of the rare earth ZSM-11 molecular sieve) is calcined at 500℃ for 3h to remove the stencil agent, and 0.6mol / L ammonium nitrate is used at 70℃ Solution exchange 3 times, water wash 2 times, 120°C drying, 500°C roasting for 4h to obtain H-type molecular sieve, and then conventionally dipping the loaded zinc metal, using zinc acetate solution, drying at 90°C for 1.5h, 500°C roasting for 5h, the resulting The Zn loading of the catalyst is 1.2wt%; the phosphoric acid solution and the boehmite are stirred evenly according to the P / Al molar ratio of 0.5, and the molecular sieve catalyst prepared in the previous step is added. The weight ratio of the molecular sieve dry basis to the boehmite dry basis is 3, and the stirring is uniform , Dried at 145°C and calcined at 500°C for 7h, the resulting catalyst is denoted as C.
Embodiment 3
[0034] A certain amount of 900nm rare earth ZSM-11 molecular sieve (the rare earth content accounts for 2.5wt% of the rare earth ZSM-11 molecular sieve) is calcined at 550°C for 4 hours to remove the stencil agent, then 0.7mol / L nitric acid is used at 60°C Exchange 3 times with ammonium solution, wash 2 times with water, dry at 120°C, roast at 550°C for 4h to obtain H-type molecular sieve, then conventionally impregnate the loaded zinc metal, use zinc nitrate solution, dry at 80°C for 3h, and roast at 550°C for 6h. The Zn loading of the catalyst is 4wt%; the phosphoric acid solution and the boehmite are stirred evenly according to the P / Al molar ratio of 0.2, and the molecular sieve catalyst prepared in the previous step is added, and the weight ratio of the molecular sieve dry basis to the boehmite dry basis is 5, and the stirring is uniform. After drying at 150°C, it was calcined at 650°C for 6 hours. The resulting catalyst was marked as D.
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