A kind of preparation method of mesomicroporous zsm-5 catalyst for rearrangement of propylene oxide
A technology of ZSM-5 and propylene oxide, which is applied in the field of catalyst preparation, can solve the problems of unstable catalytic performance and easy carbon deposition, and achieve the effect of improving catalytic stability and anti-carbon deposition performance
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Embodiment 1
[0027] First, 0.204 g of aluminum isopropoxide and 10.4 g of tetraethoxysilane were added to 20 mL of distilled water and stirred at 313 K, and the mixture was continuously stirred for 30 minutes. Then 2.5 mL of tetrapropylammonium hydroxide aqueous solution (2.0 M) was added to the above mixture at 313K, and the resulting mixture was further stirred at 313K for 2 hr. In the third step, 1.53 g of cetyltrimethylammonium chloride and 0.26 g of triblock copolymer (PEO-PPO-PEO) were dissolved in 20 mL of ethanol / water (1 / 9) to obtain a uniform solution. This was added to the reaction mixture at 313K and stirring was continued for 2 hours. Then, the hierarchically porous molecular sieve catalyst was obtained by hydrothermal treatment at 443K for 24 hours, after which the product was washed with distilled water and dried at 373K. The final product, labeled HP-ZSM-5(1), was obtained after calcination at 823K for 8 hours to remove any organics.
Embodiment 2
[0029] First, 0.204 g of aluminum isopropoxide and 10.4 g of tetraethoxysilane were added to 20 mL of distilled water and stirred at 313 K, and the mixture was continuously stirred for 30 minutes. Then 2.5 mL of tetrapropylammonium hydroxide aqueous solution (2.0 M) was added to the above mixture at 313K, and the resulting mixture was further stirred at 313K for 2 hr. In the third step, 1.53 g of cetyltrimethylammonium chloride and 0.58 g of triblock copolymer (PEO-PPO-PEO) were dissolved in 20 mL of ethanol / water (1 / 9) to obtain a uniform solution. This was added to the reaction mixture at 313K and stirring was continued for 2 hours. Then, the hierarchically porous molecular sieve catalyst was obtained by hydrothermal treatment at 443K for 24 hours, after which the product was washed with distilled water and dried at 373K. The final product, labeled HP-ZSM-5(2), was obtained after calcination at 823K for 8 hours to remove any organics.
Embodiment 3
[0031] First, 0.204 g of aluminum isopropoxide and 10.4 g of tetraethoxysilane were added to 20 mL of distilled water and stirred at 313 K, and the mixture was continuously stirred for 30 minutes. Then 2.5 mL of tetrapropylammonium hydroxide aqueous solution (2.0 M) was added to the above mixture at 313K, and the resulting mixture was further stirred at 313K for 2 hr. In the third step, 1.53 g of cetyltrimethylammonium chloride and 0.87 g of triblock copolymer (PEO-PPO-PEO) were dissolved in 20 mL of ethanol / water (1 / 9) to obtain a uniform solution. This was added to the reaction mixture at 313K and stirring was continued for 2 hours. Then, the hierarchically porous molecular sieve catalyst was obtained by hydrothermal treatment at 443K for 24 hours, after which the product was washed with distilled water and dried at 373K. The final product, labeled HP-ZSM-5(3), was obtained after calcination at 823K for 8 hours to remove any organics.
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