화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.48, 194-201, April, 2017
DOI10.1016/j.jiec.2017.01.002  Export Citation
Effects of steam introduction on deactivation of Fe-BEA catalyst in NH3-SCR of N2O and NO
Jeong Hun Baek, Soo Min Lee1, Ji Hye Park, Jeong Min Jeong, Ra Hyun Hwang, Chang Hyun Ko2, Sang Goo Jeon3, Tae Hoon Choi1, and Kwang Bok Yi1, †
  • Graduate School of Energy Science and Technology, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
  • 1Department of Chemical Engineering Education, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
  • 2School of Chemical Engineering, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
  • 3Biomass and Waste Energy Laboratory, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
E-mail:
The effects of water vapor on the catalytic activity of a Fe-BEA catalyst in the NH3-SCR reaction for N2O and NO were investigated using diffusive reflectance infrared Fourier transform spectroscopy (DRIFTS) tests and SCC-DFTB calculation. It was found that water vapor only decreased the N2O conversion rate and did not affect the conversion rates of NO. The DRIFTS analysis revealed that the presence of water increased the adsorption strength of nitrous oxide (N2O) on the catalyst surface. On the other hand, nitric oxide (NO) conversion route was only altered from NO2-SCR to standard selective catalytic reduction (SCR) upon injection of water vapor. It was confirmed that the water vapor not only inhibited the desorption of N2O during the reduction step but also induced stronger adsorption of N2O during the NH3-SCR reaction. A computational chemical model that includes hydroxyl zeolite, N2O, and NO supported the experimental result showing binding force between the hydroxyl zeolite and N2O is much higher than that between hydroxyl zeolite and NO. It is believed that the stronger adsorption induced by water vapor caused delayed dissociation of N2O thereby not allowing for catalytic conversion.
Keywords:N2O reduction;NH3-SCR;Fe-BEA;DRIFTS;SCC-DFTB method
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