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.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
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).
关键词
ZSM-5沸石
纳米沸石
微米沸石
丁烯
催化裂解
丙烯
ZSM-5 zeolite
nano-sized zeolite
micro-sized zeolite
butene
catalytic cracking
propene
