Several series of morphologically controlled MoO3/SiO2catalysts were prepared, characterized, and tested for hydrodesulfurization (HDS) of dibenzothiophene (DBT) activity. Molybdenum surface loaded with 4.0 atoms Mo/nm2was prepared as sintered hexagonal and sintered orthorhombic, as well as a novel "well dispersed hexagonal" phase. Characterization by XRD, Raman, and O2chemisorption results reveals that the dispersion of MoO3over sillica depends on the final MoO3phase in the order of; sintered hexagonal3reduce to MoO2at 650℃ and to Mo metal at 1000℃. HDS of DBT was performed in a differential reactor at 30 atm over the temperature range 350∼500℃. Activity of MoO3/SiO2toward HDS of DBT is proportional to dispersion.

결정상과 분산도가 조절된 MoO3/SiO2담지촉매를 제조하여 촉매의 표면특성과 디벤조티오펜 탈황반응의 활성도를 고찰하였다. Mo의 표면담지량은 4 atoms Mo/nm2이었으며, 실리카 표면 위에 형성된 MoO3의 결정상은 sintered hexagonal, sintered orthorhombic, 및 dispersed hexagonal상이었다. XRD, Raman, 및 O2흡착 결과 MoO3의 표면분산도는 sintered hexagonal3결정은 650℃에서 MoO2로, 1000℃에서 Mo로 환원됨을 알 수 있었다. 디벤조티오펜 탈황반응을 30기압, 350∼500℃ 온도범위에서 수행하였으며, 실험 결과 활성도는 MoO3결정체의 SiO2표면에서의 분산도에 비례하여 증가함을 알 수 있었다