A kind of catalyst, process and application for catalyzing bioethanol to prepare ethylene and propylene
A bioethanol and catalyst technology, which is applied in the field of bioethanol catalytic conversion to prepare low-carbon olefins, can solve the problems of poor stability of catalyst activity, unsatisfactory yield, easy loss of catalyst active components, etc., and achieve good selectivity and stability Good stability, excellent selectivity and stability
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[0030] In the second aspect, the present invention provides a preparation method of a catalyst for catalyzing the preparation of ethylene and propylene from bioethanol, and the preparation method of the catalyst comprises:
[0031] (1) Dissolving the zirconium source and the cesium source in deionized water to obtain a mixed aqueous solution;
[0032] (2) under stirring condition, the precipitant is added to the mixed aqueous solution;
[0033] (3) After the precipitant is added, continue to stir the solution, and then let stand for precipitation;
[0034] (4) after standing for precipitation, suction filtration, drying and roasting are performed in turn to obtain ZrO 2 / Cs 2 O.
[0035] In some embodiments, the molar ratio of the zirconium source, the cesium source, and the precipitant is 100:1-10:480-800.
[0036] In some embodiments, the molar ratio of the zirconium source, the cesium source, and the ammonia water is 100:1-10:480-800.
[0037] In some embodiments, the ...
Embodiment 1
[0047] 10g ZrO (NO 3 ) 2 ·2H 2 O and 0.07g cesium nitrate (CsNO 3 ) is dissolved in 500ml deionized water to obtain a mixed aqueous solution, measuring 17 ml of ammonia water with a mass fraction of 25% as a precipitating agent, under vigorous stirring, the precipitating agent is added dropwise to the mixed aqueous solution (the rate of addition is maintained at 1-2 drops / second). After the dropwise addition was completed, stirring was continued for 0.5 h, and then allowed to settle for 24 h. After suction filtration, it was placed in an oven, dried at 120°C for 24h, the dried sample was moved into a muffle furnace, and calcined at 540°C for 6h to obtain ZrO 2 / Cs 2 O catalyst.
Embodiment 2
[0049] 10g ZrO (NO 3 ) 2 ·8H 2 O and 0.07g cesium nitrate (CsNO 3 ) is dissolved in 500ml deionized water to obtain a mixed aqueous solution, measuring 17 ml of ammonia water with a mass fraction of 25% as a precipitating agent, under vigorous stirring, the precipitating agent is added dropwise to the mixed aqueous solution (the rate of addition is maintained at 1-2 drops / second). After the dropwise addition was completed, stirring was continued for 0.5 h, and then allowed to settle for 24 h. After suction filtration, it was placed in an oven and dried at 120 °C for 24 hours. The dried samples were moved into a muffle furnace and calcined at 640 °C for 6 hours to obtain ZrO 2 / Cs 2 O catalyst.
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