화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.6, No.3, 133-143, May, 2000
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Photocatalytic Decomposition of NO on Transition Metal Ion-exchanged Zeolite Catalysts
Masakazu Anpo†, Masaya Matsuoka, Hiromi Yamashita, Woo-Sung Ju, Sang-Eon Park1, and Yong-Gun Shul2
  • Department of Applied Chemistry, College of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka 599-8531, Japan
  • 1Catalysis Center for Molecular Engineering, KRICT, Taejon 305-606, Korea
  • 2Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea
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Transition metal ions (Cu+, Ag+) incorporated within the cavities of zeolites by an ion-exchange method show an efficient and unique photocatalytic performance for the decomposition of NO into N2 and O2 at 275 K. In situ ESR, UV-VIS, photoluminescence and XAFS(XANES and FT-EXAFS) investigations revealed that the transition metal ions exist in highly dispersed state with linear 2 coordination sphere within the pores of zeolites, the local structures of the metal ions being significantly affected by changing the kinds of zeolites. Detailed studies of the interaction of NO with the excited states of these metal ions clearly indicated that unique inner shell type excitation states of these metal ions play a significant role in the photocatalytic decomposition of NO, i.e., an electron transfer from the s orbital of the excited state of Cu+ or Ag+ ions into the π antibonding orbital of NO initiates the decomposition reaction of NO.
Keywords:photocatalyst;Cu+;Ag+;zeolites;NO decomposition
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