CoMo/γ-A1_2O_3 촉매상에서 300∼400℃의 온도와 15-30×10^5 Pa의 압력 그리고 접촉시간 0.008-0.020gcat. hr. /ml feel 범위에서 VO-TPP(VO-tetraphenylporphyrin)의 수소 첨가 탈금속반응에 관하여 연구하였다. VO-TPP의 수소 첨가 탈금속반응에서 pyridine 농도 4mole%까지는 농도가 증가함에 따라 전화율의 감소가 나타났으므로 pyridine은 수소 첨가 탈금속반응을 억제한다. 350℃ 이상의 온도에서는 VO-TPP의 외관상 반응차수가 1차였으며, Arrhenius plot에서 얻은 활성화 에너지는 약 23㎉/mole이었다. Fresh 촉매와 aged 촉매의 pore size distribution과 흡착, 탈착 isotherm으로부터 pore mouth-plugging 현상을 확인할 수 있었다.

Hydrodemetallation (HDM) of VO-tetraphenylporphyrin (VO-TPP) was studied over CoMo/γ-Al_2O_3 catalyst at emperatures between 300℃ and 400℃, the total pressure between 15×10^5 and 30×10^5 Pa and the contact times between 0.008 and 0.020gcat. hr./ml feed. HDM of VO-TPP was inhibited by pyridine because the increase of pyridine concentration(up to 4mole%) caused the decrease of HDM conversion. The reaction rate of VO-TPP was found to be apparently 1st order over 350℃ and its activation energy was determined to be about 23㎉/mole by Arrhenius plot. Pore mouth-plugging phenomena were shown by ad/desorption isotherm and pore size distribution of fresh and aged catalysts.