Ni改性HZSM-5催化剂对混合C_(4)中异丁烯齐聚的影响  

Effect of Ni-modified HZSM-5 catalysts on oligomerization of isobutylene in mixed C_(4)

作　　者：于悦[1] 张佳[1] 吕忠武[2] 纪敏[1] Yu Yue;Zhang Jia;LüZhongwu;Ji Min(School of Chemistry,Dalian University of Technology,Dalian 116023,Liaoning,China;PetroChina Petrochemical Research School of Materials Science and Engineering,Beijing 102200,China)

机构地区：[1]大连理工大学化学学院,辽宁大连116023 [2]中国石油天然气股份有限公司石油化工研究院,北京102200

出　　处：《工业催化》2023年第10期63-68,共6页Industrial Catalysis

摘　　要：近年来,乙醇汽油全面推广导致甲基叔丁基醚(MTBE)的应用受限,作为其原料之一的异丁烯需要另寻出路。异丁烯主要来源于催化裂化和蒸气裂解所产生的混合C_(4)馏分,其通过选择性二聚反应可以生产高辛烷值的汽油添加剂。以Ni为助剂对HZSM-5进行改性,考察不同Ni负载量对催化性能的影响,并对一系列催化剂进行相关表征。结果表明,当Ni负载质量分数为0.25%时,综合效果最好,C_(8)^(=)收率为45.4%。表征结果表明,HZSM-5经Ni改性后,强酸位点的Lewis酸(L酸)和Bronsted酸(B酸)比值增加,对提高产物C_(8)^(=)选择性具有重要作用,该L酸中心可能来源于Ni物种与HZSM-5中的铝相互作用所生成的NiAl_(2)O_(4)。In recent years,the application of methyl tert-butyl ether(MTBE)has been limited due to the popularization of ethanol gasoline.Isobutene,as one of its raw materials,has to find another way out.Selective oligomerization to produce high-octane isobutylene dimers is a reasonable way to make use of the large amount of mixed isobutene in C_(4) produced by catalytic cracking and steam cracking.Here,HZSM-5 was modified with Ni as additive.The effect of Ni loading on the catalytic performance was investigated and a series of catalysts were characterized.The results showed that the comprehensive effect was the best with the Ni loading was 0.25%(mass fraction),and the C_(8)^(=)yield is 45.4%.The characterization results showed that the ratio of Lewis acid(LA)and Br nsted acid(BA)of the strong acid sites of HZSM-5 was increased after Ni modification,which played an important role in improving the C_(8)^(=)selectivity.The LA centers may be derived from NiAl_(2)O_(4)generated by the interaction between Ni species and aluminum in HZSM-5.

关 键 词：石油化学工程 HZSM-5 Ni改性 强L酸 C^(=)_(8)收率 

分 类 号：TQ426.95[化学工程] TE624.9[石油与天然气工程—油气加工工程]