【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%。更多还原

【Abstract】 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 flat without flaws,with thickness of 12 μm~16 μm and catalyst particle of size 1 μm~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.更多还原