MTO与FCC汽油降烯烃组合反应催化剂的研究

以甲醇制烯烃（MTO）与催化裂化（FCC）汽油降烯烃组合反应工艺为研究目标，采用分子筛催化剂，在小型固定床微型反应装置，研究MTO反应、汽油降烯烃反应以及甲醇与汽油混合炼制反应，比较了典型酸性分子筛催化剂的催化性能。结果表明，组合反应过程呈现出非稳态特征，小分子烯烃具有自催化现象，导致产物组成分布随反应时间显著变化。NH₃-TPD分析表明，具有中强酸与强酸相结合分布特点的催化剂适合于反应过程的协同催化作用要求。适宜的反应条件为：以SAPO-34分子筛作催化剂，反应温度400 ℃，甲醇混炼比15%，反应时间30 min。该条件能同时较好满足MTO和FCC汽油改质要求，产物汽油中烯烃含量较FCC汽油中的含量下降50%，并可获得较高的小分子烯烃产率，实现MTO转化。

Study on a catalyst for combination of MTO and FCC gasoline olefin-reducing

Based on the technology combining MTO with FCC gasoline olefin-reducing and using molecular sieve catalyst,MTO,FCC gasoline olefin-reducing and combination of both were studied on a fixed bed micro-reactor.Typical acid catalysts were compared.The results showed that the combined process was non-steady and small molecule olefins exhibited autocatalytic phenomenon,resulting in notable change in product distribution with time.NH3-TPD results showed that the catalysts with moderate and strong acidity distribution could meet the requirement of the reactions on synergistic catalytic effects.Favorable reaction condition was as follows: SAPO-34 catalyst,400 ℃,m(methanol)∶ m(methanol+FCC gasoline)=15%,reaction for 30 min.Olefin content in FCC gasoline decreased by 50% and high small molecule olefins yield were attained under the condition.