Preparation and Catalytic Activity of Morphologically Controlled MoO3/SiO2 for Hydrodesulfurization

결정상과 분산도의 조절이 가능한 MoO3/SiO2 촉매의 제조 및 탈황반응특성 연구

  • Ha, Jin-Wook (Department of Chemical Engineering, College of Engineering, Soonchunhyang University)
  • 하진욱 (순천향대학교 공과대학 화학공학부)
  • Received : 1998.08.28
  • Accepted : 1998.12.23
  • Published : 1999.04.10

Abstract

Several series of morphologically controlled $MoO_3$/$SiO_2$ catalysts were prepared, characterized, and tested for hydrodesulfurization (HDS) of dibenzothiophene (DBT) activity. Molybdenum surface loaded with 4.0 atoms $Mo/nm^2$ was prepared as sintered hexagonal and sintered orthorhombic, as well as a novel "well dispersed hexagonal" phase. Characterization by XRD, Raman, and $O_2$ chemisorption results reveals that the dispersion of $MoO_3$ over silica depends on the final $MoO_3$ phase in the order of; sintered hexagonal < sintered orthorhombic < dispersed hexagonal phase. Temperature programmed reduction (TPR) results show that both bulk and dispersed microcrystalline of $MoO_3$ reduce to $MoO_2$ at $650^{\circ}C$ and to Mo metal at $1000^{\circ}C$. HDS of DBT was performed in a differential reactor at 30 atm over the temperature range $350{\sim}500^{\circ}C$. Activity of $MoO_3$/$SiO_2$ toward HDS of DBT is proportional to dispersion.

Keywords

$MoO_3$/$SiO_2$;HDS;XRD;Raman;TPR

Acknowledgement

Supported by : 한국학술진흥재단

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