Catalytic Steam Cracking of n-Heptane with Special Reference to the Effect of Calcined Dolomite

摘要

Bioresource Technology Unit (BTU), Department of Chemical Engineering, Division IV, National Technical University of Athens, Zografou Campus, GR-15700 Athens, Greece The catalyzed steam cracking of n -heptane was carried out using a fixed-bed reactor and different, commercially available limestone [CaCO_3], dolomites [CaMg(CO_3)_2], and NiMo/γ-Al_2O_3 as the catalysts. The steam cracking of n-heptane was investigated by variation of water and n-heptane partial pressure and by the additions of hydrogen and carbon dioxide to the water vapor at a total pressure of 101.3 kPa. In the presence of calcined dolomite (1073 K), the partial pressure of water vapor (p_(H_2O) = 9.1-34.2 kPa) enchances cracking efficiency, whereas hydrogen (p_(H_2) ≈ 33 kPa) and carbon dioxide (CO_2 = 39 vol %), when added to the cracking mixture (973 K), do suppress conversion of n-heptane.