Pd/HZSM-5涂层催化吸热燃料超临界裂解  

Pd/HZSM-5 coating catalyst for supercritical cracking of endothermic fuel

作　　者：赵海龙[1] 孟凡旭[1] 郭伟[1] 邹吉军[1] 张香文[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《燃料化学学报》2008年第4期462-467,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(20576098)

摘　　要：超临界催化裂解反应是实现吸热燃料功能的关键途径。采用气体辅助涂层和化学镀方法在φ3管内壁制备了Pd/HZSM-5双功能涂层催化剂。利用SEM、XRD和XPS等对涂层进行了表征,结果显示催化剂涂层表面平整,涂层厚度为12μm^16μm,催化剂粒径为1μm^5μm;Pd颗粒分散均匀,主要以零价态存在。考察了模型吸热燃料正十二烷在反应管内的超临界催化裂解反应,结果表明,Pd/HZSM-5涂层能显著促进裂解反应,在温度640℃、压力4 MPa、停留时间10 s下,吸热燃料裂解率为55.5%,产氢率为3.1%,热沉为3 470 kJ/kg,较HZSM-5涂层分别提高了8.5%,58.7%和10.5%;较热裂解分别提高了17.3%,78.1%和13.5%。Pd/HZSM-5 coating was prepared on the inner wall of φ3 tubular reactor by gas-aided fluid displacement and electroless plating technologies. The coating was characterized by means of SEM, XRD, and XPS. The coating surface was fiat without flaws, with thickness of 12 μm - 16μm and catalyst particle of size 1μm -5 μm. Metallic Pd particles were uniformly dispersed on the coating surface. The coating was used as the catalyst for the supercritical cracking of n-dodecane, a typical model compound of endothermic fuel. With the temperature of 640℃ , pressure of 4 MPa, and resident time of 10 s, Pd/HZSM-5 showed very high cracking ratio of 55.5% , hydrogen yield of 3.1% , and heat sink of 3 470 kJ/kg, which were increased by 8.5% , 58.7% , and 10.5% compared with HZSM-5 coating, respectively. Furthermore, they were 17.3%, 78. 1%, and 13.5% higher than the case of thermal cracking reaction, respectively.

关 键 词：吸热燃料 Pd/HZSM-5涂层 化学镀 超临界催化裂解 正十二烷 

分 类 号：TE626.6[石油与天然气工程—油气加工工程]