Lanthanum modified molecular sieve as well as preparation method and application thereof
A molecular sieve and modification technology, applied in the field of molecular sieve, can solve the problems of reduced reaction rate, increased production cost, catalyst deactivation, etc., and achieves the effects of increasing revenue, inhibiting deactivation, and reducing process cost.
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[0025] The present invention provides a kind of preparation method of lanthanum modified molecular sieve, comprises the following steps:
[0026] (1) Roasting after mixing silicon source, aluminum source, template agent and solvent to obtain a sintered body;
[0027] (2) mixing the sintered body, the lanthanum source and water to obtain a molecular sieve mother liquor;
[0028] (3) Sintering the mother liquor of the molecular sieve to obtain the lanthanum-modified molecular sieve.
[0029] In the present invention, the silicon source in the step (1) is preferably sodium silicate, methyl orthosilicate or ethyl orthosilicate.
[0030] In the present invention, the aluminum source is preferably sodium aluminate, aluminum nitrate or aluminum chloride.
[0031] In the present invention, the templating agent is preferably tetrapropylammonium bromide or tetrapropylammonium hydroxide; the solvent is preferably water.
[0032] In the present invention, in the step (1), the molar rat...
Embodiment 1
[0046] Take 2mol of sodium silicate, 14mol of aluminum nitrate, 1.6mol of tetrapropylammonium bromide and 2842g of water and stir at 160°C and 400rpm for 60h; after the stirring is completed, the mixture is roasted at 900°C for 7h to obtain a sintered body; The sintered body, 1mol of lanthanum nitrate and 2280g of water were immersed for 3 hours at room temperature. After the impregnation, set the ultrasonic power to 2100w and the ultrasonic frequency to 90kHZ, and ultrasonically impregnated for 1.5 hours to obtain the molecular sieve mother liquor; sinter the molecular sieve mother liquor at 650°C for 11 hours to obtain Lanthanum modified molecular sieves.
[0047] The catalytic performance of the lanthanum-modified molecular sieve prepared in this example and the ZSM-5 molecular sieve was compared for conversion of methanol to ethylene, and the results are recorded in Table 1.
Embodiment 2
[0049] Take 1mol of methyl orthosilicate, 8mol of aluminum chloride, 1.2mol of tetrapropylammonium bromide and 730g of water and stir at 170°C and 450rpm for 65h; after the stirring is completed, roast the mixture at 800°C for 8h to obtain sintering body; impregnate the sintered body, 0.5mol of lanthanum chloride and 910g of water at room temperature for 4 hours, after the impregnation, set the ultrasonic power to 2400w, ultrasonic frequency to 100kHZ, ultrasonic impregnation for 1.8h to obtain the molecular sieve mother liquor; sinter the molecular sieve mother liquor at 700°C After 12 hours, the lanthanum-modified molecular sieve can be obtained.
[0050] The lanthanum-modified molecular sieve prepared in this example was subjected to a methanol conversion ethylene catalytic test, and the results are recorded in Table 1.
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