A metal-modified zsm-5 molecular sieve catalyst and its preparation method and application
A ZSM-5, -ZSM-5 technology, applied in the field of metal modified ZSM-5 molecular sieve catalyst and its preparation, can solve the problems of easy agglomeration of metals, high energy consumption, waste of metal activity, etc. The effect of improving the utilization rate of metal
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[0049] In a second aspect, the present invention provides a method for preparing the above-mentioned metal-modified ZSM-5 molecular sieve catalyst, comprising the following steps:
[0050] Adding ZSM-5 molecular sieve powder to the mixed solution of tetrabutyl titanate and n-hexanoic acid, mixing uniformly, and reacting at room temperature to prepare titanium dioxide-ZSM-5 molecular sieve particles;
[0051]The titanium dioxide-ZSM-5 molecular sieve particles are dispersed in ethanol water, and then bismuth nitrate is added thereto, dissolved and mixed evenly, and the mixed solution is irradiated with a mercury lamp for a set time to obtain the target molecular sieve catalyst.
[0052] The room temperature here means that the reaction temperature is 25°C.
[0053] In some embodiments, the solvent of the mixed solution of tetrabutyl titanate and n-hexanoic acid is absolute ethanol.
[0054] Further, the mixed solution of tetrabutyl titanate and n-hexanoic acid also includes wa...
Embodiment 1
[0066] Titanium dioxide-ZSM-5 molecular sieve (TiO 2 - Synthesis of ZSM-5): Weigh 3g of ZSM-5 molecular sieve and evenly disperse it in 500ml of ethanol, and perform ultrasonic stirring to obtain a suspension; Measure 2.2g of tetrabutyl titanate and dissolve it in 40mL of ethanol; The solution was mixed with the suspension, and 0.35 g of n-hexanoic acid was dissolved in the mixture; 30 mL of deionized water was slowly added dropwise to the above solution, and stirred rapidly for 12 h at room temperature; after the reaction was completed, washed with deionized water and ethanol in turn. Three times and centrifuged to remove unreacted residues, dried in an oven at 60°C, and the dried samples were ground for use.
[0067] Catalysts were prepared with a bismuth loading of 1%. Metal Bi was successfully and uniformly loaded onto the molecular sieve surface by photodeposition technique: take 3 g of the TiO prepared above 2 -ZSM-5 powder is uniformly dispersed in a certain amount of...
Embodiment 2
[0069] TiO 2 -Synthesis of ZSM-5 is the same as in Example 1.
[0070] A catalyst was prepared with a bismuth loading of 2.5%. Metal Bi was successfully and uniformly loaded onto the molecular sieve surface by photodeposition technique: take 3 g of the TiO prepared above 2 - The ZSM-5 powder was uniformly dispersed in a certain amount of ethanol water, and then 0.2 g of Bi (NO 3 ) 3 ·5H 2 O was dissolved in the solution, and ultrasonic stirring was performed to make it well mixed. Then, it was irradiated with a mercury lamp with a light power of 500W for 5 hours. After the irradiation, the catalyst was centrifuged, washed with deionized water and ethanol three times to remove unreacted residues, and dried in an oven at 60 °C. Sample grinding.
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