CHA-RHO type composite molecular sieve as well as preparation method and application thereof
A composite molecular sieve and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, and hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problems of reduced selectivity of low-carbon olefins, easy deactivation life, low catalyst activity, etc., to achieve Effect of high olefin selectivity, long service life, and long reaction life
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[0029] Example 1:
[0030] A CHA-RHO type composite molecular sieve is prepared by the following method:
[0031] (1) Weigh 14.57g of SB powder and dissolve it in 88.27g of deionized water and stir well at room temperature, then add 11.53g of 85% orthophosphoric acid to it and continue to stir evenly for 2 hours, filter the slurry, and dry it at 120°C for 2 hours. Calcined at 450°C for 2 hours to obtain phosphor-aluminum dry glue, and then crushed to obtain particles ≤100μm;
[0032] (2) Mix all the phosphor aluminum dry glue particles obtained in step (1) with 0.31 g white carbon black, 45 g deionized water, 0.431 g n-propylamine and 4.38 g triethylamine to obtain a mixture;
[0033] (3) Transfer the mixture obtained in step (2) to an autoclave, stir at 500r / min for 0.5h, stir and crystallize at 140℃ for 24h, and then heat to 170℃ to crystallize for 48h; crystallization is complete Then quickly cool with water to stop crystallization, and the product is separated by suction filtrati...
Example Embodiment
[0035] Example 2:
[0036] A CHA-RHO type composite molecular sieve is prepared by the following method:
[0037] (1) Weigh 13.59g pseudo-boehmite and dissolve it in 108g deionized water and stir evenly at room temperature, then add 23.24g ammonium dihydrogen phosphate to it and continue to stir evenly for 2 hours, filter the slurry, and dry it at 110°C for 4h, 500 Calcination at ℃ for 2h to obtain phosphor-aluminum dry glue, and then crush to obtain particles ≤100μm;
[0038] (2) Mix all the phosphor-aluminum dry gum particles obtained in step (1) with 0.61 g chromatography silica gel, 54 g deionized water, 7.7 g morpholine and 1.815 g tripropylamine to obtain a mixture;
[0039] (3) Transfer the mixture obtained in step (2) to a stainless steel autoclave, stir at 600r / min for 0.5h, stir and crystallize at 150℃ for 24h, and then heat up to 180℃ to crystallize for 48h; crystallization After completion, quickly cool with water to stop crystallization. After the product is separated by...
Example Embodiment
[0041] Example 3:
[0042] A CHA-RHO type composite molecular sieve is prepared by the following method:
[0043] (1) Weigh 75.78g of aluminum nitrate and dissolve it in 126g of deionized water at room temperature and stir evenly, then add 40.02g of diammonium hydrogen phosphate to it and continue to stir evenly for 2 hours, filter the slurry, dry at 120°C for 2h, and roast at 500°C for 2h Obtain phosphor-aluminum dry glue, and then pulverize to obtain particles ≤100μm;
[0044] (2) Mix all the phosphor aluminum dry glue particles obtained in step (1) with 3.19 g ethyl silicate, 63 g deionized water, 14.34 g piperidine and 2.06 g 2-hydroxyethylamine to obtain a mixture;
[0045] (3) Transfer the mixture obtained in step (2) to a stainless steel autoclave, stir at 450r / min for 1h, stir and crystallize at 160℃ for 24h, then heat up to 190℃ to crystallize for 48h; crystallization is complete After cooling with water quickly to stop crystallization, the product is separated by suction fi...
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