Double-component modification method of molecular sieve in FCC catalyst and molecular sieve modified through method

[0057] Take 1.86 g (NH 4 ) 2 HPO 4 Dissolve in 100 grams of distilled water, add 20 grams of ZSM-5 molecular sieve sample into the solution under stirring condition, and adjust the pH value to 4. At a reaction temperature of 100°C, stirring and reacting for 60 minutes, it directly enters flash drying, and then the obtained sample is calcined at 500°C with 30% water vapor for 4 hours to obtain a molecular sieve. Take 0.73g of zirconium nitrate and dissolve it in 350g of distilled water, add a molecular sieve into the zirconium-containing solution, stir and react at a reaction temperature of 20°C for 120 minutes, then flash dry, then roast at 500°C for 2 hours, and the obtained The molecular sieve sample was designated NZ-1. Then kaolin (45%), aluminum sol (15%) and NZ-1 (40%) were added into distilled water for beating according to the above ratio, dried at 120°C, roasted at 450°C for 1 hour, crushed and sieved, and the obtained catalyst sample was recorded as CNZ -1. 20-40 m

[0059] Take 6.48 g H 3 PO 4 Dissolve in 80 grams of distilled water, add 20 grams of ZSM-5 molecular sieve sample into the solution under stirring conditions, and adjust the pH value to 1. At a reaction temperature of 160°C, stirring and reacting for 120 minutes, flash drying was carried out, and then calcined at 300°C for 6 hours to obtain a molecular sieve. Take 1.46g of titanium tetrachloride and dissolve it in 350g of distilled water, add a molecular sieve into the zirconium-containing solution, stir and react at a reaction temperature of 40°C for 100 minutes, perform flash drying, and then roast at 500°C for 2 hours , The resulting sample is denoted as NZ-2. Then kaolin (45%), aluminum sol (15%) and NZ-2 (40%) were added into distilled water in a fixed proportion for beating, dried at 120°C, roasted at 450°C for 1 hour, crushed and sieved, and the obtained catalyst sample was recorded as CNZ -2. Catalyst samples with 20-40 mesh particles were taken for microactivity inve

[0061] Take 1.80 g H 3 PO 4 Dissolve in 80 grams of distilled water, add 20 grams of ZSM-5 molecular sieve sample into the solution under stirring conditions, and adjust the pH value to 5. At a reaction temperature of 160°C, stir and react for 120 minutes to flash dry, and then bake at 500°C for 6 hours to obtain a molecular sieve. Dissolve 1.46g of ferric nitrate in 350g of distilled water, add a molecular sieve to the iron-containing solution, stir and react at a reaction temperature of 40°C for 100 minutes, then enter flash drying, and then roast at 500°C for 2 hours to obtain The sample is designated as NZ-3. Then kaolin (45%), aluminum sol (15%) and NZ-3 (40%) were added in proportion to beating in distilled water, dried at 120°C, roasted at 450°C for 1 hour, crushed and sieved, and the obtained catalyst sample was recorded as CNZ- 3. The composition of the molecular sieve samples, the crystallinity before and after aging and the microreactivity of the obtained catalyst