ZSM-5-based solid acid catalyst and preparation method thereof
A solid acid catalyst, ZSM-5 technology, applied in the field of catalysis, can solve the problems that have not yet been reported in patents, and achieve the effect of being beneficial to industrial production and application, with good low-temperature activity and good stability
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0042] Example 1: ZSM-5 / γ-Al 2 o 3 The preparation of catalyst (scheme two):
[0043] 1) Preparation of solution
[0044] Weigh 5.5g of ZSM-5 molecular sieve (silicon-aluminum ratio=38), 3.32g of NaOH, add 27mL of water, treat at 80°C for 30min, and denote the obtained slurry as A. Weigh 15.6gAl(OH) 3, 10gNaOH, 44mL water reacted at 120°C for 2h to obtain NaAlO with a concentration of about 4.5mol / L 2 Solution B. Weigh 17.19gAl 2 (SO4) 3 18H 2 O is mixed with 43ml of water to obtain Al with a concentration of 0.05mol / L 2 (SO 4 ) 3 Solution C.
[0045] 2) Synthesis of precursors
[0046] Mix solutions B and C, add them to a round bottom flask at the same rate under mechanical stirring to obtain slurry D2, and use HNO 3 Adjust the pH value to 6, and mechanically stir at room temperature for 1 h. Then slurry A was mixed with D2, with HNO 3 Adjust the pH value to 10; heat up to 90°C for aging, and mechanically stir for 6 hours. After aging, use Na at 60°C 2 CO 3 ...
Embodiment 2
[0055] ZSM-5 / γ-Al 2 o 3 Catalyst preparation: refer to the preparation steps in Example 1, the difference is that step 2) the precursor synthesis step is: mix slurry A and B at room temperature to obtain D1, neutralize D1 and C, and drip under mechanical stirring Add to round bottom flask with HNO 3 Control pH around 10. After the neutralization process, keep the pH at 10, heat up to 90°C for aging, and stir mechanically for 6 hours. After aging, use Na at 60°C 2 CO 3 Solution (concentration: 1 mol / L) was washed twice, and water was washed four times at 60°C.
[0056] Catalyst activity evaluation method is with embodiment 1, and reaction result sees Table 1 shown.
Embodiment 3
[0058] ZSM-5 / γ-Al 2 o 3 Catalyst preparation: refer to the preparation steps in Example 1, the difference is the third step precursor synthesis, the steps are: neutralize the solutions B and C, add them to the round bottom flask under mechanical stirring to obtain the slurry D3, with HNO 3 Adjust the pH value to 6, mechanically stir at room temperature for 1 h, and then use Na 2 CO 3 Control pH around 10. Raise the temperature to 90°C for aging, and mechanically stir for 6 hours. After aging, use Na at 60°C 2 CO 3 Solution (concentration: 1 mol / L) was washed twice, and water was washed four times at 60°C. Then the washed D3 and A were mixed, and mechanically stirred at 60° C. for 1 h. Wash as above again.
[0059] Catalyst activity evaluation method is with embodiment 1, and reaction result sees Table 1 shown. According to the evaluation results, preferably, the addition sequence in Example 1 is used to synthesize the composite catalyst, and the obtained product ha...
PUM
| Property | Measurement | Unit |
|---|---|---|
| pore size | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More