ASAXS study of the influence of sulfidation conditions and organic additives on sulfide slabs multiscale organization

One of the ways to improve activity sulfide catalysts is increase quantity molybdenum up contents greater than 15 wt%. For such high Mo contents, distribution MoS2 particles suspected play an important role in catalytic activity. A complete description active phase thus required and implies measuring i) size stacking isolated slabs, ii) proportion involved aggregates or individual iii) aggregates. These steps are essential deeply explain intrinsic catalysts. To address this challenge, Anomalous Small-Angle X-ray Scattering (ASAXS) analyses have been performed on different sets catalysts, prepared with various organic additives activated either by a gas sulfidation (1 bar, 350 °C,15%H2S/H2) real industrial liquid (30 °C, H2/gas oil/DMDS). Furthermore, spent were also characterized after HDS test feedstock. The aim study was not elucidate detail chemical mechanisms when using conditions, but rather better understand impact microstructural organization performances demonstrate potential ASAXS technique give new insights multi-scale phase. We that allows obtain more detailed slabs compared TEM and, simultaneously, identify quantify aggregation state which occurs loaded clearly highlighted sulfidation, as we dispersive effect triethylene glycol thioglycolic acid lower extent citric acid. slab length decreased, well aggregate amount size. analysis revealed significant evolution under reaction conditions. Among other parameters, appears relevant descriptor since correlation found performances, suggests issue sites accessibility.