Molecular sieve catalyst for catalyzing hydrocarbon cracking to produce propylene and its preparation method and use
A technology for catalyzing hydrocarbons and molecular sieves, applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of low propylene selectivity, impossibility to improve, high ethylene selectivity, etc., achieve simple and easy preparation method, improve propylene yield The effect of high efficiency and easy raw materials
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[0053] A first aspect of the present invention provides a method for preparing a molecular sieve catalyst for catalyzing hydrocarbon cracking to produce propylene, comprising the following steps:
[0054] A precursor solution is obtained after mixing a silicon source, a templating agent and an optional aluminum source in a solvent; the precursor solution is subjected to hydrothermal crystallization to obtain a hydrothermally crystallized product. Then, the product is washed with deionized water until neutral, and the hydrothermally crystallized product is calcined to obtain a molecular sieve catalyst precursor. The molecular sieve precursor is subjected to ammonium exchange, dried, and then calcined to obtain a molecular sieve carrier.
[0055] The obtained molecular sieve is used as the carrier, the aluminum-containing solution is used as the precursor of the metal solution, and the aluminum is loaded on the molecular sieve carrier by the equal volume impregnation method; the...
Embodiment 1～5
[0087] 8.32g tetraethyl orthosilicate (TOES), 13.0g tetrapropylammonium hydroxide (TPAOH) (25wt% aqueous solution), certain mass of aluminum sulfate (Al 2 (SO 4 ) 3 ·18H 2 O) and 25.16 g of deionized water were configured to obtain a mixed solution. The mixed solution was stirred at room temperature for 24 hours to obtain a crystallized solution. The crystallized solution was placed in a crystallization kettle, and hydrothermally crystallized at 165 °C for 3 days to obtain a hydrothermally crystallized product; the synthesized hydrothermal The crystallized product powder was washed with deionized water until neutral, dried at 120°C, and calcined at 550°C for 6 hours in a muffle furnace air atmosphere to obtain the ZSM-5 molecular sieve precursor. Weigh 1 g of ZSM-5 molecular sieve precursor and 125 mL of 1 mol / L NH 4 The Cl solution was mixed, heated in a water bath at 85°C, stirred for 3h, washed with deionized water until neutral, dried at 120°C for 6h, and calcined at 5...
Embodiment 1
[0088] The mass of aluminum sulfate used in Example 1 was 0.1 g, and the theoretical n(Si) / n(Al) of the obtained molecular sieve was 150.
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