Preparation method of rare earth metal Ce doped H-ZSM-34 molecular sieve
A technology of rare earth metals and molecular sieves, applied in the direction of molecular sieve catalysts, molecular sieves and alkali exchange compounds, non-metallic elements, etc., can solve the problems of low propylene efficiency, easy deactivation, and short supply, and achieve high production efficiency, suitable acidity, and long life. Effect
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Embodiment 1
[0019] A preparation method of the rare earth metal Ce-doped H-ZSM-34 molecular sieve includes the following steps:
[0020] ①Add 3.5 g NaAlO 2 , 7 g NaOH, 22 g KOH, and 67.5 g of water-soluble silica gel were sequentially added to 100 ml of water, stirred for 0.5 h, and the mixture was aged for 3 days to obtain a clear seed solution (mixture A); 5.54 g NaOH, 28.85 g Water-soluble silica gel was added to 83 ml of water in sequence, stirred for 5 h, and then added in sequence of 2.71 g Al 2 (SO4) 3 ·18H 2 O and 10ml mixture A to obtain the precursor liquid;
[0021] ②After stirring the precursor fluid for 0.5 h, add Ce(NO) to the precursor fluid at the ratio of Ce / Al=0.06 3 ) 3 ·6H 2 O solid, stirred at room temperature for 13 hours, put into the kettle, crystallized at 120°C for 7 days, removed from the kettle, filtered and washed with suction, dried at 100°C, and calcined in air at 550°C for 6 hours to obtain Ce-doped Na-ZSM-34;
[0022] ③Add 2g of Ce-doped Na-ZSM-34 to 40 mL of 1mo...
Embodiment 2
[0027] A preparation method of the rare earth metal Ce-doped H-ZSM-34 molecular sieve includes the following steps:
[0028] ①Add 3.5 g Na Al O 2 , 7 g NaOH, 22 g KOH, and 67.5 g of water-soluble silica gel were added to 100 ml of water in sequence, and stirred for 0.5 h. The mixture was aged for 3 days to obtain a clear seed solution (mixture A); 5.54 g of NaOH and 28.85 g of water-soluble silica gel were sequentially added to 83 ml of water, stirred for 5 h, and then added 2.71 g of Al 2 (SO4) 3 ·18H 2 O and 10ml mixture A to obtain the precursor liquid;
[0029] ② After stirring the precursor fluid for 0.5 h, add Ce(NO) to the precursor fluid at the ratio of Ce / Al=0.07 3 ) 3 ·6H 2 O solid, stirred at room temperature for 13 hours, put into the kettle, crystallized at 120°C for 7 days, removed from the kettle, filtered and washed with suction, dried at 100°C, and calcined in air at 550°C for 6 hours to obtain Ce-doped Na-ZSM-34;
[0030] ③Add 2g of Ce-doped Na-ZSM-34 to 40 mL of 1m...
Embodiment 3
[0035] A preparation method of the rare earth metal Ce doped molecular sieve H-ZSM-35 includes the following steps:
[0036] ①Add 3.5 g Na Al O 2 , 7 g NaOH, 22 g KOH, and 67.5 g of water-soluble silica gel were sequentially added to 100 ml of water, stirred for 0.5 h, and the mixture was aged for 3 days to obtain a clear seed solution (mixture A); 5.54 g NaOH, 28.85 g Water-soluble silica gel was added to 83 ml of water in sequence, stirred for 5 h, and then added in sequence of 2.71 g Al 2 (SO4) 3 ·18H 2 O and 10ml mixture A to obtain the precursor liquid;
[0037] ②After stirring the precursor fluid for 0.5 h, add Ce(NO) to the precursor fluid at the ratio of Ce / Al=0.08 3 ) 3 ·6H 2 O solid, stirred at room temperature for 13 hours, put into the kettle, crystallized at 120°C for 7 days, removed from the kettle, filtered and washed with suction, dried at 100°C, and calcined in air at 550°C for 6 hours to obtain Ce-doped Na-ZSM-34;
[0038] ③Add 2g of Ce-doped Na-ZSM-34 to 40 mL of 1...
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