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

Koji Nakano, Weiwei Pang, Jihn Koo Lee, Joo Il Park, Seong Ho Yoon, Isao Mochida

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Abstract

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 °C, respectively, in the single bed reactor at a liquid hourly space velocity (LHSV) of 1 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 °C, respectively, and achieved 5 and 2 ppm S, indicating better performance at higher temperatures. The reaction order for the hydrodesulfurization (HDS) 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.

Original languageEnglish
Pages (from-to)1012-1018
Number of pages7
JournalFuel Processing Technology
Volume92
Issue number5
DOIs
Publication statusPublished - May 1 2011

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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