Sulfidation of Supported Ni, Mo and NiMo Catalysts Studied by In Situ XAFS

Abstract Active sites in Mo-based hydrotreating catalysts are produced by sulfidation. To achieve insights that may enable optimization of the catalysts, this process should be studied situ. Herein we present a comparative XAFS study where situ sulfidation Mo/δ-Al 2 O 3 and Ni/δ-Al is compared to δ-Al supported NiMo with different ratios. The also covers comparison Ni Mo using oxide supports as well conditions applied reactor. spectra confirms phase for all at beginning reaction their conversion sulfidized followed measurements. Furthermore, it found monometallic less readily than bimetallic ones, indicating importance Ni-Mo interactions catalyst activation. K-edge did not show any difference related support or pressure during reaction. spectra, however, more complete species when SiO used Al . Nevertheless, believed stronger prevent sintering which leads its stabilization. results contribute better understanding how parameters affect formation active production biofuel.