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作 者:彭岩 王学林[1,2] 王从新 田志坚[1] Peng Yan;Wang Xuelin;Wang Congxin;Tian Zhijian(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;Universityof Chinese Academy of Sciences,Beijing 100049,China)
机构地区:[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049
出 处:《工业催化》2022年第7期17-24,共8页Industrial Catalysis
基 金:国家重点研发计划项目(2020YFB0606405);中国科学院战略性先导专项A(XDA21021201)。
摘 要:采用超声辅助浸渍法制备Na改性Pt/SAPO-11催化剂,采用氨气程序升温脱附,吡啶红外和固体核磁表征催化剂酸性,并通过正十二烷异构化反应评价催化剂活性。表征结果表明,Na的引入降低了Pt/SAPO-11的中强B酸酸量和总酸量。反应结果表明,与未改性的Pt/SAPO-11催化剂相比,引入Na助剂后,催化剂上异构体选择性显著提升,实现了89%的异构体收率。结合反应评价和表征结果,讨论了Na助剂对催化剂上烷烃异构化反应路径的影响。Na-modified Pt/SAPO-11 catalyst was prepared by ultrasonic-assistant impregnation method.The temperature-programmed desorption of ammonia,pyridine-FT-IR and solid-state magic-angle-spinning NMR results reveals that the Na-modification reduces the amount of medium-strong strength Br nsted acid sites and total acid sites on Pt/SAPO-11 catalysts.The results of the n-dodecane hydroisomerization show that the selectivity of the i-dodecane increased significantly with the modification of Na promoter as compared with the unmodified Pt/SAPO-11 catalyst.An i-dodecane yield of 89%has been obtained on the Pt5Na/SAPO-11 catalyst.Combined with the results of the reaction and characterization,it was demonstrated that the Na promoter could affect the reaction pathway of n-alkane hydroisomerization on the catalyst.
关 键 词:催化剂工程 Na助剂 Pt/SAPO-11 烷烃异构化 双功能催化剂
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