丁烯在纳米H-ZSM-5催化剂上的催化裂解反应  

Catalytic Cracking of Butene over Nano-Sized H-ZSM-5 Catalyst

作　　者：李福芬[1] 贾文浩[1] 陈黎行[1] 郭洪臣[1] 

机构地区：[1]大连理工大学化工学院催化化学与工程系及精细化工国家重点实验室,辽宁大连116012

出　　处：《催化学报》2007年第6期567-571,共5页

基　　金：辽宁省优秀青年科技人才培养基金(2005222010).

摘　　要：在小型固定床反应器中考察了纳米H-ZSM-5催化剂(晶粒度为20～50nm)对丁烯催化裂解制丙烯反应的催化性能,并与两种微米H-ZSM-5催化剂样品(晶粒度分别为1～2和1～6μm)进行了比较.结果表明,在相同的反应条件下,纳米H-ZSM-5和微米H-ZSM-5催化剂上的初始丁烯转化率及丙烯收率相当,但纳米H-ZSM-5催化剂在反应中的抗积碳失活性能优于微米H-ZSM-5催化剂.在进料质量空速7h-1,常压和560℃的条件下反应,当丁烯转化率和丙烯收率下降50%时,两种微米催化剂上的反应时间仅为28h左右,而纳米催化剂上的反应时间为120h左右.积碳分析结果表明,纳米催化剂上的积碳速率明显低于微米催化剂.In a small continuous flowing fixed-bed reactor, the nano-sized H-ZSM-5 catalyst with crystal size of 20-50 nm was applied to the catalytic cracking of butene from liquefied petroleum gas for propene synthesis. The catalytic performance of the nano-sized H-ZSM-5 catalyst was compared with that of two micro-sized H-ZSM-5 samples with crystal size of 1-2 and 1-6 μm, respectively. Under the same reaction conditions, the nano-sized H-ZSM-5 and the micro-sized H-ZSM-5 samples had approximately the same initial butene conversion and propene yield. However, the nano-sized H-ZSM-5 sample exhibited better resistance to coking and deactivation. Under the reaction conditions of WHSV = 7 h^- 1, p = 0.1 MPa, and 0 = 560 ℃ , the butene conversion and propene yield over the micro-sized H-ZSM-5 samples decreased by about 50 % after reaction for only 28 h, whereas over the nano-sized H-ZSM-5 sample the reaction time could be prolonged to 120 h. According to the coke analysis results, the coking rate on the nano-sized H-ZSM-5 sample was lower than that on the micro-sized samples.

关 键 词：ZSM-5沸石 纳米沸石 微米沸石 丁烯 催化裂解 丙烯 

分 类 号：O643.32[理学—物理化学]