Method for regenerating catalyst
A technology for regenerating catalysts and catalysts, applied in the field of catalysis, can solve problems such as difficulty in adapting to the needs of catalyst regeneration, and achieve the effect of improving the selectivity of low-carbon olefins and reducing operation steps
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Embodiment 1
[0051]5g 1# catalyst SAPO-34 molecular sieve was filled into a stainless steel reaction tube with an inner diameter of 16mm, activated with 100ml / min nitrogen at 450°C for 4h, and then adjusted to the reaction temperature. The methanol-to-olefin reaction was carried out in a high-pressure hydrogen environment. The reaction conditions were: reaction temperature (T)=400°C, reaction pressure (P)=3MPa, methanol mass space velocity (WHSV)=2h -1 , hydrogen: methanol (H 2 :MeOH) molar ratio=10:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results were shown in Table 1. After a period of reaction time, the catalyst activity decreases, stop feeding methanol at the original temperature and pressure, and regenerate it in a hydrogen environment. After the first regeneration, methanol is fed again, and the methanol-to-olefin reaction is carried out again. In this cycle, the results of catalyst reaction and regeneration are listed in Ta...
Embodiment 2
[0055] 5g 1# catalyst SAPO-34 molecular sieve was filled into a stainless steel reaction tube with an inner diameter of 16mm, activated with 100ml / min nitrogen at 450°C for 4h, and then adjusted to the reaction temperature. The reaction of dimethyl ether to olefins was carried out under high pressure hydrogen environment, and the reaction conditions were: reaction temperature (T)=400°C, reaction pressure (P)=3MPa, dimethyl ether mass space velocity (WHSV)=1h -1 , hydrogen: dimethyl ether (H 2 :DME) molar ratio=20:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results were shown in Table 1. After the catalyst activity decreases after a period of reaction, the feeding of dimethyl ether is stopped at the original temperature and pressure, and the regeneration is carried out in a hydrogen environment. After the first regeneration, dimethyl ether is fed again, and the dimethyl ether-to-olefin reaction is carried out again. In th...
Embodiment 3
[0059] 5g 2# catalyst SAPO-18 molecular sieve was filled into a stainless steel reaction tube with an inner diameter of 16mm, activated with 100ml / min nitrogen at 450°C for 4h, and then adjusted to the reaction temperature. The methanol-to-olefin reaction was carried out in a high-pressure hydrogen environment. The reaction conditions were: reaction temperature (T)=430°C, reaction pressure (P)=4MPa, methanol mass space velocity (WHSV)=2h -1 , hydrogen: methanol (H 2 :MeOH) molar ratio=10:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results were shown in Table 1. After a period of reaction time, the catalyst activity decreases, stop feeding methanol at the original temperature and pressure, and regenerate it in a hydrogen environment. After the first regeneration, methanol is fed again, and the methanol-to-olefin reaction is carried out again. This cycle, the results of the catalyst reaction and regeneration results are li...
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