Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents.

摘要: The article presents the results of a study thiophene oxidation in high-density C4H4S/O2 mixtures (ρThi = 0.12 and 0.15 mol/dm3, ρO2 0.74-1.26 mol/dm3), diluted with water vapor argon (dilution level xD 35-65% mol), at uniform heating (1 K/min) stainless-steel tubular reactor up to 823 K. It is established that temperature onset weakly depends on nature diluent oxygen content reaction mixture. From time dependences pressure, it follows media proceeds according mechanisms homogeneous heterogeneous reactions. Upon stoichiometric small amount vapor, as well lean contribution reactions surface Pt-Rh/Pt thermocouple, inserted into center volume, increased. fuel-enriched mixtures, oxidized wall (primarily iron oxides) prevail. Increasing density both reduces prevents complete carbon burnout. shown neutralization sulfuric acid, resulting from thiophene, calcium carbonate corrosion stainless steel. X-ray diffraction analysis revealed presence ferrochromite, chromium oxides, iron, nickel, sulfates products.