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폐 PET 해중합용 재사용 및 재생 가능한 불균일 촉매
최종인(Jong-In Choi),Haoxiang Zhang,Saira Kanwa,강유진(Yujin Kang),김주완(Joowan Kim),Chitra Sarkar,홍도영(Do-Young Hong) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.2
The synthesis of a porous MgA1₂O₄ spinel-supported Mn₃O₄ catalyst for polyethylene terephthalate (PET) glycolysis involves a systematic process commencing with MgAl-layered double hydroxide (LDH) as a template. Sequential thermal and chemical treatments, culminating in Mn oxide loading, yield a mesoporous structure within the MgA1₂O₄ spine], affording a substantial surface area of 278 m²/g. The strategic substitution of A13+ and incorporation of Mn cation into defects ensure the highly dispersed and strongly stabilized Mn₃O₄. The strong interaction between Mn oxide and the porous MgA1₂O₄ spinel support significantly enhanced moderate acidic and basic properties, ensuring remarkable resistance to Mn leaching during glycolysis. Utilizing the Mn₃O₄/p-spMgAl800 catalyst, a yield exceeding 95% of bis(2-hydroxyethyl) terephthalate was achieved within 3 hours at 190 °C. Remarkably, even after undergoing eleven recycling cycles with regeneration, the catalytic activity remained largely unaffected and was fully restored post thermal regeneration at 500°C.
폐 PET 해중합 반응을 위한 재사용 및 재생이 가능한 Mn 치환 MgAI₂O₄ 스피넬 촉매
최종인(Jong In Choi),Haoxiang Zhang,김주완(Joo Wan Kim),Chitra sarkar,Saira kanwall,강유진(Yu Jin Kang),배윤상(Youn-Sang Bae),홍도영(Do-Young Hong) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.2
Catalytic glycolysis with ethylene glycol (EG) is a promising method for recycling PET with lower CO₂ emissions and the production of monomer-level PET. Various catalysts have been explored for this process, with metal oxides offering advantages in terms of separation, preparation cost. and reusability through regeneration. However, using a high EG concentration to achieve high BHET monomer selectivity in PET glycolysis can lead to issues such as residue deposition on the catalyst and metal oxide dissolution in the solvent at elevated temperatures. To address these challenges, it is crucial to develop a catalyst that is not only highly stable during the reaction but also recyclable and regenerable. Spinel, known for their exceptional thermal and chemical stability, offer a solution. Additionally, the acidic and basic properties of spinel can be adjusted by partially substituting them with various metal cations. Taking into account the characteristics of spinel, Mn-substituted MgAI₂O₄ (MnxMg₁-xAl₂O₄, x= 0-0. 3) were successfully synthesized by co-precipitation and applied to PET glycolysis as catalyst. The conversion of PET over the MnxMg₁-xAl₂O₄ catalyst is monotortically increased from 37.1% (x=O) to 100% (x= 0. 25) and the selectivity to BHET was achieved to 95%. The recyclability and regenerability of Mn-substituted MgAI₂O₄ were also conducted.
Hong, Do-Young,Jhung, Sung Hwa,Vislovskiy, V. P.,Chang, Jong-San,Yoo, Jin S.,Park, Sang-Eon,Park, Yeung-Ho 한국공업화학회 2004 응용화학 Vol.8 No.2
Over V-Sb-O/Al₂O₃ catalyst, substantially higher (~ 20 - 60% in relative) conversions of initial hydrocarbons and yields of corresponding alkenylbenzenes have been achieved under the dehydrogenation of ethylbenzene, iso- and n-propylbenzenes, 1,4-diethylbenzene and 4-ethyltoluene in the presence of carbon dioxide, compared to those in inert atmosphere, due to promotional oxidative functions of CO₂ to alleviate the dehydrogenation equilibrium as well as to maintain V-sites in active oxidation state, V^(5+).