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4MPa、停留时间10s下，吸热燃料裂解率为55.5%，产氢率为3.1%，热沉为3470kJ/kg，较HZSM5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%。
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 12μm~16 μm and catalyst particle of size 1μm~5μm. 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 4MPa, and resident time of 10s, Pd/HZSM5showed very high cracking ratio of 55.5%, hydrogen yield of 3.1%, and heat sink of 3470kJ/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.
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