Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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The Effect of Structure and Acidity of Fluorinated HZSM-5 on Ethylene Aromatization

불소화 HZSM-5의 구조 및 산도가 에틸렌 방향족화에 미치는 영향

  • Kyeong Nan, Kim (C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology) ;
  • Seok Chang, Kang (C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology) ;
  • Geunjae, Kwak (Department of Science Education, Gwangju National University of Education)
  • 김경난 (한국화학연구원(KRICT) C1가스탄소융합연구센터) ;
  • 강석창 (한국화학연구원(KRICT) C1가스탄소융합연구센터) ;
  • 곽근재 (광주교육대학교 과학교육과)
  • Received : 2022.12.14
  • Accepted : 2022.12.26
  • Published : 2023.02.10
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Abstract

Recent studies have actively investigated ways to improve the economic feasibility and efficiency of the Fischer-Tropsch process by increasing the yields of the monocyclic aromatic compounds (BTEX). In this study, ethylene was selected as a model of F-T-derived hydrocarbons, and the ethylene-to-aromatics (ETA) reaction was investigated according to changes in acid characteristics, mesopores, and crystallinity of HZSM-5 (HZ5). Fluorinated HZ5 was prepared by calcination followed by impregnation of an aqueous NH4F solution having different molar concentrations in HZ5, and the structural and chemical properties of F/HZ5 were investigated through Brunauer-Emmett-Teller (BET), solid-state nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), NH3-temperature-programmed desorption (TPD), and pyridine-IR spectroscopy. The ETA reactions were performed at 673 K under 0.1 MPa, and fluorinating HZ5 by an aqueous NH4F solution of 0.17 M improved ethylene conversion, BTEX selectivity, and catalytic stability due to acidity, mesopore fraction, and crystallinity.

최근, 피셔-트롭시(Fischer-Tpropsch, F-T) 합성 생성물의 단환방향족(BTEX) 수율을 향상시켜 공정 경제성 및 효율을 높이기 위한 연구가 활발하다. 본 연구에서는, F-T 유래 탄화수소의 모델로서 에틸렌을 선정하고, HZSM-5 (HZ5)의 산특성, 메조기공율 및 결정화도 변화에 따른 에틸렌으로부터 방향족 합성 반응(ethylene-to-aromatics, ETA) 거동에 대하여 조사하였다. HZ5에 몰농도를 달리한 NH4F 수용액을 함침 및 소성하여 불소 도입 HZ5를 제조하였으며, F/HZ5의 구조 및 화학적 특성은 BET, 고체 NMR, XPS, NH3-TPD 및 피리딘-IR 분광법을 통하여 조사되었다. ETA 반응은 673 K, 0.1 MPa의 조건에서 실시되었으며, 0.17 M NH4F 수용액 처리에 의한 불소화 HZ5는 산특성, 메조기공율 및 결정성 향상에 기인하여 에틸렌 전환율, BTEX 선택도 및 촉매 안정성이 향상되었다.

Keywords

Acknowledgement

본 과제(결과물)는 2021년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업의 결과입니다. (2021RIS-004)

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