논문 해외 국제전문학술지(SCI급) Catalytic Synergy between Lewis Acidic Alumina and Pt in Hydrodechlorination for Plastic Chemical Recycling
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2024-08
- 저자명 Seok, J., Phan, N. T. Y., Kim, J.-C., Shin, H.,* and Choi, M.*
- 학술지명 Journal of the American Chemical Society
- 발행처명 ACS Publications
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
- 연구분야 공학 > 화학공학
- 원문 링크 https://pubs.acs.org/doi/abs/10.1021/jacs.4c06231
홈페이지논문 초록 (Abstract)
Pyrolysis-based plastic chemical recycling has gained significant industrial attention due to its advantage of eliminating complex plastic sorting processes. However, plastic pyrolysis oil contains various components that require stringent removal before subsequent processes. In particular, Cl compounds originating from the decomposition of polyvinyl chloride can cause serious corrosion of reactors and catalyst deactivation in downstream processes. While extensive research has been conducted on the removal of other heteroatoms (S, N, and O) from organic compounds via hydrotreating, studies on the removal of Cl have been scarce. In this study, hydrodechlorination over Pt catalysts on various supports is comprehensively investigated using 1,2-dichloroethane as a model reactant. Our results demonstrate that Pt on γ-Al2O3 can exhibit exceptionally high catalytic activity compared to those on other supports due to a distinct bifunctional mechanism. Rigorous studies reveal that the Lewis acidic pentacoordinated Al sites of γ-Al2O3 activate C–Cl bonds, whereas Pt activates H2 and provides spillover H to remove Cl as HCl. The bifunctional mechanism enables the minimized use of precious Pt (<0.1 wt%) to achieve high activity. Pt/γ-Al2O3 also allows for efficient Cl removal (96.8%) with high stability in treating waste plastic pyrolysis oil containing 7500 ppm of Cl.