Catalyst for producing propylene by catalytic pyrolysis and preparation method thereof
A catalytic cracking and catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, bulk chemical production, etc., can solve the problems of less research on the optimization and utilization of olefins, achieve improved yield and selectivity, simple process flow, Highly stable effect
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[0026] The method for preparing propylene catalyst by catalytic cracking of olefin provided by the present invention includes:
[0027] 1) The original molecular sieve powder with a grain size of 10-100nm is roasted at 400-700℃ to remove the template, and exchanged in a solution containing ammonium ions for 1 to 4 times, each exchange is 2-4 hours, and the exchange temperature is 50 ~120℃, the concentration of ammonium ion in the solution is 0.5~2mol / L, after the exchange is completed, it is dried and calcined to obtain a hydrogen molecular sieve;
[0028] 2) Immerse the hydrogen molecular sieve in a solution containing phosphorus and / or group IB metal ions, then dry and calcinate at 400-700°C for 2-6 hours to obtain a modified molecular sieve;
[0029] 3) Mix the modified molecular sieve with the heat-resistant inorganic oxide or its precursor and water uniformly, shape it into the desired shape, dry, and fire at a temperature of 400-800°C for 2-8 hours, preferably 500- Calcined ...
Example Embodiment
[0050] Example 1
[0051] 1) The original ZSM-23 molecular sieve powder with a particle size of 10-100nm is roasted at 550℃ to remove the template agent, and then mixed with 1mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100°C for 4 hours each time. After the exchange, it was dried and calcined at 550°C for 4 hours to obtain a hydrogen molecular sieve.
[0052] 2) Put the hydrogen type ZSM-23 molecular sieve in a certain concentration of (NH) 2 HPO 4 Soaked in the solution, then dried and calcined at 500°C for 3 hours to obtain a P-modified molecular sieve; so that based on the total weight of the molecular sieve, the P content is 2.0% by weight;
[0053] 3) Mix the phosphorus-modified molecular sieve, silica sol and appropriate amount of water obtained in step 2 according to the weight ratio of molecular sieve dry basis: silica sol = 25:75, grind uniformly and extrude them into shape, dry and roast to obtain catalyst A1 .
Example Embodiment
[0054] Example 2
[0055] 1) The original ZSM-5 molecular sieve powder with a particle size of 10-100nm is roasted at 600°C to remove the template, and then mixed with 1mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100°C for 4 hours each time. After the exchange, it was dried and calcined at 600°C for 4 hours to obtain a hydrogen molecular sieve.
[0056] 2) Put the hydrogen type ZSM-5 molecular sieve in a certain concentration of AgNO 3 Soaked in the solution, then dried and calcined at 550°C for 2 hours to obtain the Ag modified molecular sieve; so that the Ag content is 2.2% by weight based on the total weight of the molecular sieve;
[0057] 3) Mix the silver modified molecular sieve, pseudo-boehmite and appropriate amount of water obtained in step 2 according to the weight ratio of dry basis molecular sieve: pseudo-boehmite = 40:60, grind them evenly and extrude them into shape, dry, After calcination, catalyst A2 is obtained.
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