청정기술 (Clean Technology)

  • 제29권1호
  • /
  • Pages.39-45
  • /
  • 2023
  • /
  • 1598-9712(pISSN)
  • /
  • 2288-0690(eISSN)
한국청정기술학회 (The Korean Society of Clean Technology)
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Effects of Mg Addition to Cu/Al2O3 Catalyst for Low-Temperature Water Gas Shift (LT-WGS) Reaction

  • Zakia Akter Sonia (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Ji Hye Park (Department of Chemical Engineering Education, Chungnam National University) ;
  • Wathone Oo (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kwang Bok Yi (Department of Chemical Engineering Education, Chungnam National University)
  • 투고 : 2022.12.12
  • 심사 : 2023.01.16
  • 발행 : 2023.03.31
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초록

To investigate the effects of Mg addition at different aging times and temperatures, Cu/MgO/Al2O3 catalysts were synthesized for the low-temperature water gas shift (LT-WGS) reaction. The co-precipitation method was employed to prepare the catalysts with a fixed Cu amount of 30 mol% and varied amounts of Mg/Al. Synthesized catalysts were characterized using XRD, BET, and H2-TPR analysis. Among the prepared catalysts, the highest CO conversion was achieved by the Cu/MgO/Al2O3 catalyst (30/40/30 mol%) with a 60 ℃ aging temperature and a 24 h aging time under a CO2-rich feed gas. Due to it having the lowest reduction temperature and a good dispersion of CuO, the catalyst exhibited around 65% CO conversion with a gas hourly space velocity (GHSV) of 14,089 h-1 at 300 ℃. However, it has been noted that aging temperatures greater or less than 60 ℃ and aging times longer than 24 h had an adverse impact, resulting in a lower surface area and a higher reduction temperature bulk-CuO phase, leading to lower catalytic activity. The main findings of this study confirmed that one of the main factors determining catalytic activity is the ease of reducibility in the absence of bulk-like CuO species. Finally, the long-term test revealed that the catalytic activity and stability remained constant under a high concentration of CO2 in the feed gas for 19 h with an average CO conversion of 61.83%.

키워드

과제정보

This research was supported by a grant (22PCHG-C161575-02) from "Development of Demonstration-scale Hydrogen Production Technology using Petroleum coke" Program funded by Ministry of Land, Infrastructure and Transport of Korea government.

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