Abstract: By constructing four types of sulfided hydrogenation catalysts, the active phase structures and metal chemical state distributions of different sulfided hydrogenation catalysts were systematically investigated. The catalysts were characterized using TEM, XPS, and other analytical methods. The results indicated that modifier modification significantly influenced the active phase structure and chemical state changes of the active metals in the catalysts. The introduction of modifiers weakened the interaction between the active metals and the support, enhancing the dispersion of active metals on the catalyst. Additionally, modifier modification facilitated the transformation of hexavalent molybdenum through intermediate pentavalent molybdenum to tetravalent molybdenum and promoted the conversion of divalent nickel into the NiMoS phase. The performance evaluation results of catalytic cracking diesel hydrotreating showed that compared to commercial catalysts, the modified catalyst with ethylene glycol exhibited a more pronounced reduction in aromatic content, decreasing by 11.7 percentage points, with an additional 8.4 percentage points reduction compared to commercial catalysts. Notably, the content of bicyclic aromatics decreased significantly, with the ethylene glycol-modified catalyst reducing it by 39.6 percentage points, surpassing the commercial catalyst by 2.7 percentage points.

Key words: hydrogenation catalyst, sulfided type, active phase, chemical state, catalytic performance