n-Dodecane reforming over nickel-based monolith catalysts: Deactivation and carbon deposition

摘要: Abstract The carbon deposition behavior of Ni-based monolith reforming catalysts was studied during n -dodecane autothermal reforming, partial oxidation, and steam reforming. One catalyst formulation nickel deposited on cerium zirconium oxide (CZO) coated monolith, while the second directly bare monolith. In both formulations, a series with range loadings (0–16 wt.%) were prepared to examine influence loading elucidate benefits reducible support CZO deposition. Carbon generally more pronounced at higher lacking CZO. Nickel supported suffered from excessive carbon-induced disintegration. morphologies determined by scanning electron microscopy (SEM). Temperature programmed oxidation (TPO) indicated presence two types carbon. low-temperature TPO peak can be attributed coating carbon, high-temperature corresponds filamentous structures, including large whiskers smaller filaments. Accumulation whisker had deleterious effect substrate resulting in physical destruction some samples. X-ray diffraction (XRD) gave no evidence for graphite or carbide species carbon-deposited catalysts. experimental results this study are used diagnose causes deactivation proposing strategies mitigate deactivation.