Method for improving efficiency of methanol-to-propylene catalyst
A methanol-to-propylene and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of low catalytic efficiency and high selectivity of by-products, and achieve simple preparation process, improved selectivity, and stable good sex effect
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Embodiment 1
[0024] Weigh 4g SiO 2 Silica sol with a content of 40wt% and 40g of ZSM-5 raw powder with Si / Al=200 in 156g of deionized water were fully stirred to prepare a slurry containing 20wt% of ZSM-5 raw powder.
[0025] Immerse the cordierite carrier with a diameter of 20 mm and a length of 30 mm in the ZSM-5 slurry in the above steps, take it out after 30 seconds, and blow out the excess slurry with compressed air to keep all the channels unobstructed. Then it was dried in an oven at 100 °C for 2 h. Repeat this process 2 times.
[0026] The ZSM-5-coated cordierite carrier obtained in the above steps is put into a muffle furnace and calcined at 550° C. for 5 hours to obtain the ZSM-5 / cordierite structured catalyst. The ZSM-5 content of the catalyst is 28g / 100g carrier, and the ZSM-5 content per unit volume is 0.17g / cm 3 .
[0027] The catalyst (A) prepared in Example 1 and the traditional strip ZSM-5 molecular sieve (Φ3mm) were evaluated for methanol-to-propylene reaction activit...
Embodiment 2
[0031] According to the various steps and conditions of the implementation example 1, the ZSM-5 / cordierite structured catalyst is prepared, only by changing the mass fraction of ZSM-5 in the slurry and the total number of times that the carrier is immersed in the slurry, catalysts with different coating amounts of ZSM-5 can be obtained , and its specific preparation conditions and results are shown in Table 2.
[0032] Table 2 Unit: g / 100g carrier
[0033]
Embodiment 3
[0035] According to the method used in Example 1, the catalyst (A) prepared in Example 1 and the traditional strip ZSM-5 molecular sieve (Φ 3mm) are evaluated for methanol-to-propylene reaction activity, but the process conditions are changed to: the operating pressure is 0.02Mpa ( Gauge pressure), in which the partial pressure of methanol is 10kPa, the partial pressure of butene is 10kPa, the partial pressure of water is 25kPa, and the rest is nitrogen; the temperature is 480°C; the gas space time is 1.27kg·s·mol -1 . The results are shown in Table 3.
[0036] table 3
[0037]
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