论文部分内容阅读
通过水热合成法和离子交换法制备了负载Ni的介孔Ni-HZSM-5分子筛催化剂,采用XRD、SEM、EDX、Fr-IR、N2物理吸附-脱附等手段对催化剂组成、结构和形貌进行了研究,并以固定床微石英管反应器考察了不同反应温度、空速条件下介孔 Ni-HZSM-5分子筛催化剂的乙烯齐聚反应性能.结果表明,Ni-HZSM-5样品具有介孔ZSM-5分子筛典型的特征结构,Ni进入分子筛骨架致使比表面降低,但孔径变大,更有利于齐聚反应的进行;在气体空速为1.2 L/(g·h)、反应温度为275℃时,乙烯的转化率为87.82％,C4的选择性可达57.25％,C6的选择性可达30.74％,说明Ni-HZSM-5催化剂对乙烯齐聚具有较好的催化性能.“,”The Ni-supporting mesoporous Ni-HZSM-5 molecular sieve catalyst is synthesized by using hydrothermal synthesis and ion exchange methods.The composition,structure and morphology of prepared catalyst are investigated by XRD,SEM,EDX,FT-IR and N2 adsorption-desorption.The reaction performance of ethylene oligomerization over the prepared Ni-HZSM-5 molecular sieve catalyst is studied under different reaction temperatures and gas hourly space velocities (GHSV) in a fixed bed microquartz tube reactor.The results show that Ni-HZSM-5 samples have the same typical characteristic structure as mesoporous ZSM-5 molecular sieve.The specific surface area reduces slightly and pore size expands as Ni atoms embed in sieve frameworks,which is benefit to oligomerization.The conversion rate of ethylene can reach 87.82％ with the selectivity rates of C4 and C6 being 57.25％ and 30.74％,respectively under conditions that GHSV is 1.2 L/(g· h) and reaction temperature is 275℃.In summary,Ni-HZSM-5 catalyst has high catalytic performance for ethylene oligomerization.