Activity of alumina-silica-supported NiMoS prepared by controlled mixing of alumina into SiO2 hydrogels for HDS of gas oil

作者：Nakano Koji; Pang Weiwei; Lee Jihn Koo; Park Joo Il; Yoon Seong Ho^*; Mochida Isao

来源：Fuel Processing Technology, 2011, 92(5): 1012-1018.

DOI：10.1016/j.fuproc.2010.12.024

• Alumina-silica
• Preparation
• Particle size
• SiO2 content
• Activity

Alumina-silica-supported NiMoS composites were examined in single- and dual-layer catalyst beds in a high-pressure (5 MPa) flow reactor to achieve ultra low sulfur (10 ppm) diesel fuels. Three types of alumina-silica composite supports were prepared by co-precipitation to control the particle size and arrangement of alumina and silica. The SiO2 content was found to be influential on catalytic performance, being best by around 27% regardless of preparation conditions. Alumina crystal size controlled the acidity and surface area of the support, key factors influencing catalytic performance. NiMoASA-2(27). prepared by procedure 2, achieved 4.5 and 3 ppm S at 345 and 360 degrees C, respectively, in the single bed reactor at a liquid hourly space velocity (LHSV) of h(-1). NiMoASA-2(27) achieved the best performance of the supports examined in this study. The double-layer catalyst bed contained commercial CoMoS (LX6) and NiMoASA-2(27) in the first and the second beds at 345 and 360 degrees C. respectively, and achieved 5 and 2 ppm S. indicating better performance at higher temperatures. The reaction order for the hydrodesulfurization (HOS) of refractory sulfur species was close to unity over NiMoASA-2(27). which was significantly higher than that of the commercial CoMoS catalyst. Alumina-silica supported NiMoS in the second bed of the dual-layer catalyst bed achieved less than 10 ppm S for refractory sulfur species with around 500 ppm S.

• 出版日期2011-5