화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.35, No.1, 89-98, January, 2018
DOI10.1007/s11814-017-0268-x  Export Citation
Effects of copper loading on NH3-SCR and NO oxidation over Cu impregnated CHA zeolite
Nusnin Akter1, Xianyin Chen2, John Parise2, Jorge Anibal Boscoboinik1, 3, and Taejin Kim1, †
  • 1Materials Science and Chemical Engineering Department, Stony Brook University, Stony Brook, NY 11794, U.S.A., USA
  • 2Geosciences Department, Stony Brook University, Brook, NY 11794, U.S.A., USA
  • 3Center for Functional Laboratory, Brookhaven National Laboratory, Upton, NY 11973, U.S.A., USA
E-mail:
Cu/CHA catalysts with various Cu loadings (0.5 wt%-6.0 wt%) were synthesized via incipient wetness impregnation. The catalysts were applied to the selective catalytic reduction (SCR) of NO with NH3 and NO oxidation reaction. XRD and N2 adsorption-desorption data showed that CHA structure was maintained with the incorporation of Cu, while specific surface areas decreased with increasing Cu loading. At intermediate Cu loading, 4 wt%, the highest NH3-SCR activity was observed with ~98% N2 selectivity from 150 °C to 300 °C. Small amounts of water, 2%, slightly increased NO conversion in addition to the remarkable N2O and NO2 reduction at high temperature. Water effects are attributed to the improved Cu ion reducibility and mobility. NO oxidation results provided no relation between NO2 formation and SCR activity. Physicochemical properties, NO conversion, N2 selectivity, and activation energy data showed that impregnated samples’ molecular structure and catalytic activity are comparable to the conventional ion-exchanged (IE) samples’ ones.
Keywords:Chabazite Framework Zeolite;Selective Catalytic Reduction (SCR);Copper Loading;Incipient Wetness
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