A kind of n-butene isomerization catalyst and preparation method thereof
A catalyst and isomerization technology, which are applied in the field of n-butene isomerization catalyst and preparation thereof, can solve the problems of complicated operation steps, single carrier pores, poor catalytic effect, etc., and achieve high catalytic activity, simple preparation method, Highly selective effect
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Embodiment 1
[0032] 1) Preparation of SAPO-11 / SAPO-46 composite molecular sieve
[0033] Weigh 9.52 g (0.07 mol) of pseudo-boehmite, dissolve it in 10 g of deionized water to prepare a pseudo-boehmite aqueous solution, and stir for 0.5 h. 16.14g (0.14mol) of H 3 PO 4 (85% by weight in water) and stirred for another 1 h. Measure 4.78ml (0.035mol) of di-n-propylamine and add it dropwise to the above solution, and stir for 1h. Next, 10.08 g (0.042 mol) of silica sol was weighed and added to the above solution. Add water and stir for 1h to obtain a colloidal mixture, in which the number of moles of Al 2 o 3 :R:P 2 o 5 :SiO2 2 :H 2 O=1:0.5:1:0.6:50, wherein R is di-n-propylamine.
[0034] The colloidal mixture prepared above was aged at 80°C for 4h, then heated to 180°C, and hydrothermally crystallized under autogenous pressure for 22h. The crystallized product was cooled, washed by centrifugation, and then dried at 120°C for 12h. Obtain SAPO-11 / SAPO-46 composite molecular sieve, it...
Embodiment 2
[0041] 1) Preparation of SAPO-11 / SAPO-46 composite molecular sieve
[0042] Weigh 9.52 g (0.07 mol) of pseudo-boehmite, dissolve it in 10 g of deionized water to prepare a pseudo-boehmite aqueous solution, and stir for 0.5 h. 16.14g (0.14mol) of H 3 PO 4 (85% by weight in water) and stirred for another 1 h. Measure 7.64ml (0.056mol) of diisopropylamine and add it dropwise to the above solution, and stir for 1h. Next, 10.08 g (0.042 mol) of silica sol was weighed and added to the above solution. Add water and stir for 1h to obtain a colloidal mixture, in which the number of moles of Al 2 o 3 :R:P 2 o 5 :SiO2 2 :H 2 O=1:0.8:1:0.6:40, wherein R is diisopropylamine.
[0043] The colloidal mixture prepared above was aged at 100°C for 3h, then heated to 180°C, and hydrothermally crystallized under autogenous pressure for 12h. The crystallized product was cooled, washed by centrifugation, and then dried at 110° C. for 12 hours to obtain a SAPO-11 / SAPO-46 composite molecula...
Embodiment 3
[0050] 1) Preparation of SAPO-11 / SAPO-46 composite molecular sieve
[0051] Weigh 9.52 g (0.07 mol) of pseudo-boehmite, dissolve it in 10 g of deionized water to prepare a pseudo-boehmite aqueous solution, and stir for 0.5 h. 16.14g (0.14mol) of H 3 PO 4 (85% by weight aqueous solution), and then stirred for 1 h; weighed 14.3 ml (0.105 mol) of di-n-propylamine and added dropwise to the above solution, and stirred for 1 h. Next, 13.44 g (0.056 mol) of silica sol was weighed and added to the above solution. Add water and stir for 1h to obtain a colloidal mixture, in which the number of moles of Al 2 o 3 :R:P 2 o 5 :SiO2 2 :H 2 O=1:1.5:1:0.8:50, wherein R is di-n-propylamine.
[0052] The colloidal mixture prepared above was aged at 110°C for 4h, then heated to 180°C, and hydrothermally crystallized under autogenous pressure for 8h. The crystallized product was cooled, washed by centrifugation, and then dried at 120° C. for 6 h to obtain a SAPO-11 / SAPO-46 composite mole...
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