Abstract:

Metallic monolith catalysts, Pd-Zr/SBA-15/Al₂O₃/FeCrAl and Pt-Sn-Li/Al₂O₃/FeCrAl, for the exothermic catalytic combustion of methane and the endothermic dehydrogenation of dodecane were placed respectively into the inner tube and annular space of a tubular jacket reactor that could be heated by an external electric furnace. Their thermal coupling was tested. The experimental results showed that the oven temperature was slightly lower than that of the metallic monolith catalyst beds, indicating that the heat required for dodecane dehydrogenation reaction came indeed from that released by methane combustion, at least mostly, and thus demonstrating indirect thermal coupling between the two reactions taking place on the metallic monolith catalysts. Under the reaction conditions of pressure 0.1 MPa, oven temperature 743.15 K, GHSV 7.5 ml·m^-2·h^-1(3.5% CH₄/air feed), C₁₂H₂₆ LHSV 0.315 ml·m^-2·h^-1, and molar ratio of hydrogen to alkane 4, methane was converted at 100%, C₁₂H₂₆ conversion was 6.3%, and C₁₂H₂₄ selectivity was 71.5%.

摘要：

将甲烷催化燃烧的Pd-Zr/SBA-15/Al₂O₃/FeCrAl金属整体式催化剂和十二烷催化脱氢的Pt-Sn-Li/Al₂O₃/FeCrAl金属整体式催化剂分别填充在套管式反应器的内管和环隙中，在电炉伴温条件下研究了这两个反应的热耦合。实验结果表明，炉温略低于催化剂床层温度，说明吸热反应所需的热量来源于放热反应，实现了两个反应的间接热耦合。在常压、炉温743.15 K、催化燃烧侧甲烷进料浓度3.5%、气时空速（GHSV）7.5 ml·m^-2·h^-1、C₁₂H₂₆液时空速（LHSV）0.315 ml·m^-2·