# 수소첨가반응용 니켈 폐촉매의 활성재생에 관한 연구 (I)

• Park, Paul Worn (Department of Chemical Technology, College of Engineering, Seoul National University) ;
• Lim, Ki-Chul (Science & Technology Policy Institute) ;
• Lee, Ho-In (Department of Chemical Technology, College of Engineering, Seoul National University)
• 박포원 (서울대학교 공과대학 공업화학과) ;
• 임기철 (과학기술정책연구소) ;
• 이호인 (서울대학교 공과대학 공업화학과)
Regeneration of Ni catalyst deactivated by carbon-deposition and sulfur-poisoning was studied. When a carbon-deposited catalyst was regenerated by hydrogen, the final recovery of catalytic activity for benzene hydrogenation was large but relatively long period of regeneration was required, and futhermore the deposited carbon could not be removed completely. In case of oxygen-treatment, the regeneration rate was high and the deposited carbon could be removed almost completely after a subsequent reduction treatment. When a sulfur-poisoned catalyst was regenerated by hydrogen and water vapor, the catalytic activity was not recovered. The regeneration treatment with oxygen at $650^{\circ}C$ recovered the catalytic activity up to 60 % of the initial value. When $Cl^-$ was added to oxygen, the activity was easily recovered to 45 % of the initial value even after treatment at $500^{\circ}C$. Sintering of the dispersed Ni particles was enhanced by water vapor but was hindered by oxygen and chlorine addition.