| 초록 |
As regulation on NOx emission, NOx removal system is getting more attention in industrial fields. For reducing NOx emission, NH3-SCR (Selective Catalytic Reduction) is regarded as the most efficient NOx removal technology. Cu zeolite catalysts have been used commercially for NH3-SCR catalysts because of their high NOx conversion and stability. There are some researches about characteristics of Cu ion, and one of those is its mobility in the zeolite cage. For proving Cu ion mobility, in this research, we compare two catalysts, one is physically mixed Cu-SSZ-13 and H-SSZ-13 with close contact (PM-C-SSZ), the other is the mixture with loose contact (PM-L-SSZ). In the PM-C-SSZ, Cu ion can move from Cu-SSZ-13 to H-SSZ-13 because its particles had close contact. However, in the PM-L-SSZ sample, Cu ion cannot move to H-SSZ-13 because particles were separated. The catalysts have different reactivity and characteristics by the migration of Cu ions. These discrepancies indicate that inter-particle migration of Cu ions is possible through the particle-particle interface. |
