ZSM-5 molecular sieve based catalyst modified by phosphor and rear earth as well as preparation method and application of ZSM-5 molecular sieve based catalyst
A technology of ZSM-5 and rare earth modification, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of isopropanol conversion rate, low propylene selectivity, and high reaction temperature
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Embodiment 1
[0083] This example is used to illustrate the phosphorus and rare earth modified ZSM-5 molecular sieve catalyst provided by the present invention and its preparation method.
[0084] Weigh 3.0g of NaOH and 45.0g of tetrapropylammonium hydroxide solution (30% by weight), dissolve in 300.0g of distilled water, and stir thoroughly to obtain solution A; dissolve 3.0g of aluminum trichloride in 300.0g of ethanol, and stir fully Obtain solution B; add 114.6 g of tetraethyl silicate dropwise to solution A, stir thoroughly for 10 minutes to obtain gel C; then add solution B dropwise to gel C, and stir thoroughly for 30 minutes to obtain gel D, the pH value is 11. Then the gel D was transferred into a 1.5-liter high-pressure reactor for static crystallization at 110° C. for 4 days. The obtained product was separated by centrifugation, dried at 110°C for 12 hours, and then calcined at 550°C for 8 hours to remove the template agent to obtain 26.2g of small particle size ZSM-5 molecular ...
Embodiment 2
[0091] This example is used to illustrate the phosphorus and rare earth modified ZSM-5 molecular sieve catalyst provided by the present invention and its preparation method.
[0092] Weigh 1.5g of KOH and 24.0g of n-butylamine, dissolve in 135.0g of distilled water, stir well to obtain solution A; take 1.80g of Al(NO 3 ) 3 9H 2 Dissolve O in 100.0g of methanol to obtain solution B; add 145.0g of tetramethyl silicate dropwise to solution A, stir thoroughly for 10 minutes to obtain gel C; then add B dropwise to gel C The solution was stirred thoroughly for 30 minutes to obtain gel D with a pH value of 9.5. Then the gel D was transferred into a 500 ml self-generating pressure stainless steel reaction tank, and statically crystallized at 150° C. for 2 days. The obtained product was centrifuged, separated, dried at 110°C for 12 hours, and then calcined at 400°C for 15 hours to remove the template agent to obtain 45.5g of small particle size ZSM-5 molecular sieve product (denoted...
experiment example 3
[0099] This example is used to illustrate the phosphorus and rare earth modified ZSM-5 molecular sieve catalyst provided by the present invention and its preparation method.
[0100] Weigh 1.0g of NaOH and 30.0g of tetrapropylammonium hydroxide solution (40% by weight), dissolve them in 160.0g of distilled water, stir well to obtain solution A; take 1.2g of Al 2 (SO 4 ) 3 18H 2 O was dissolved in 60.0g of n-butanol to obtain solution B; 72.0g of tetraethyl silicate was added dropwise to solution A and stirred thoroughly for 10 minutes to obtain gel C; then B was added dropwise to gel C The solution was stirred thoroughly for 30 minutes to obtain gel D with a pH value of 12. Then the gel D was transferred into a 500 ml self-generating pressure stainless steel reaction tank, and statically crystallized at 90° C. for 7 days. The obtained product was centrifuged, separated, dried at 110°C for 12 hours, and then calcined at 550°C for 8 hours to remove the template agent to obta...
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