Hierarchical pore FAU structure molecular sieve and preparation method thereof
A molecular sieve, multi-stage pore technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, other chemical processes, etc., can solve the problem of large damage to the original FAU micropore structure of molecular sieves, narrow silicon-aluminum ratio range, and mesopore pore size. Problems such as poor distribution, to achieve the effect of high microporous crystal shape retention, uniform distribution and good acidity
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Embodiment 1
[0099] Take 50g of molecular sieve with FAU structure (Si / Al=5.2), press the molecular sieve powder into pieces and put it into a quartz tube, then pass water through the molecular sieve at 550°C to carry out steam treatment for 2.0h; Add 10 g of molecular sieves to 200 ml of 0.50 mol / L NaOH solution, stir magnetically at 80 °C for 1.0 h, then filter and wash until neutral, dry in an oven at 120 °C for 12 h, then place in a muffle furnace Calcined at 600°C for 3.0h. The obtained molecular sieve was designated as sample A. The yield of sample A after treatment was 60.1%, and its silicon-aluminum ratio was 4.4. Add sample A to 1.0 mol / L ammonium nitrate solution with a solid-to-liquid ratio of 1:30, and magnetically stir at 85°C for 2h, then filter and wash, dry in an oven at 120°C for 12h, and then dry in a horse Calcined at 500°C for 3.5h in a Furnace to obtain hydrogen molecular sieve HA.
Embodiment 2
[0105] Take 50g of molecular sieve with FAU structure (Si / Al=5.2), press the molecular sieve powder into tablets, break into pieces and put them into a quartz tube, then pass water through the molecular sieve at 400°C for the first steam treatment for 2.0h, And the obtained molecular sieve was subjected to water vapor treatment for the second time at 600° C. for 4.0 h; 10 g of the obtained molecular sieve was added to 400 ml of 0.50 mol / L NaOH solution, and magnetically stirred at 90° C. for 1.5 h, Then it was filtered and washed until neutral, dried in an oven at 120°C for 12h, and then calcined in a muffle furnace at 600°C for 3.0h. The obtained molecular sieve was designated as sample B. The yield of sample B after treatment was 62.3%, and its silicon-aluminum ratio was 4.6. Add sample B to 1.0 mol / L ammonium nitrate solution with a solid-to-liquid ratio of 1:30, and magnetically stir at 85 °C for 2 h, then filter and wash, dry in an oven at 120 °C for 12 h, and Calcined ...
Embodiment 3
[0107] Take 50g of molecular sieve with FAU structure (Si / Al=2.4), press the molecular sieve powder into pieces and put it into a quartz tube, then pass water through the molecular sieve at 600°C to carry out steam treatment for 6.0h; Add 10 g of molecular sieves to 200 ml of 0.40 mol / L NaOH solution, stir magnetically at 80 ° C for 0.5 h, then filter and wash until neutral, dry in an oven at 120 ° C for 12 h, and then place in a muffle furnace Calcined at 400°C for 5.0h. The obtained molecular sieve is designated as sample C. The yield of sample C after treatment was 65.5%, and its silicon-aluminum ratio was 2.2. Sample C was added to 1.0 mol / L ammonium nitrate solution with a solid-to-liquid ratio of 1:30 and magnetically stirred at 85 °C for 2 h, then filtered and washed, dried in an oven at 120 °C for 12 h, and then placed in a horse Calcined at 500°C for 3.5h in a Furnace to obtain hydrogen molecular sieve HC.
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