Silicon modification of the catalyst for FCC gasoline aromatization
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摘要: 采用外表面覆硅改性，内表面金属锌改性制备了ZnSi/HZSM-5芳构化催化剂，以全馏分FCC汽油为原料，在实验室固定床反应装置上进行催化剂的抗积炭及芳构化性能评价，并探讨了催化剂改性机理。采用XRD、BET、Py-IR及元素分析等方法对催化剂晶相、孔结构、酸性及抗积炭性能进行了表征。结果表明，在500℃、1.5MPa及空速为3.0h-1的条件下，液相产品中烯烃及芳烃质量分数分别为21.75%和27.32%，锌硅改性催化剂具有较高的活性、稳定性及芳构化降烯烃性能。Abstract: ZnSi/HZSM-5 aromatization catalyst was prepared by modification with silicon on the outer surface and zinc on the inner surface; its aromatization performance and resistance to carbon deposition were investigated in a laboratory fixed reactor with the full range FCC gasoline as the feed. The modification mechanism was also discussed. The crystal phase, pore structure, acidity of the modified catalysts and the coke formed during the reaction were characterized by means of XRD, BET surface area, Py-IR and elemental analyses. The modified ZnSi/HZSM-5 aromatization catalyst exhibits a superior activity, stability and performance in reducing olefin content of FCC gasoline; under the conditions of 500℃, 1.5MPa and a space velocity of 3.0h-1, the mass fractions of olefins and aromatics in the upgraded gasoline are 21.75% and 27.32%, respectively.
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Key words:
- HZSM-5 /
- aromatization /
- FCC gasoline /
- silicon modification /
- zinc modification
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