Preparation, characterization and activity of novel silica-pillared layered titanoniobate supported copper catalysts for the direct decomposition of NO

作者：Wang XG; Hou WH; Wang XS; Yan QJ^*

来源：Applied Catalysis B: Environmental , 2002, 35(3): 185-193.

DOI：10.1016/S0926-3373(01)00253-3

• NO decomposition
• copper oxide
• layered titanoniobate
• pillaring
• silica

A series of silica-pillared layered titanoniobate supported copper catalysts (Cu/Si-TiNbO5) were prepared for the direct decomposition of NO. It was found that Cu/Si-TiNbO5 catalysts were highly active for the reaction of NO (0.1 vol.% in He) decomposition in the space velocity range of 3000-30,000 cm(3) g(-1) h(-1). The 3.5 wt.% Cu/Si-TiNbO5 catalyst showed the highest conversion into N-2 for NO decomposition. While 2.0 wt.% Cu/Si-TiNbO5 had the highest specific activity at low temperature (less than or equal to550degreesC) and 1.0 wt.% Cu/Si-TiNbO5 showed the highest specific activity at high temperature (>550degreesC). XRD and temperature-programmed reduction (TPR) results indicated that there existed well-dispersed copper oxide species and large copper oxide particles in the catalysts. Well-dispersed copper oxide species were reduced more easily than large copper oxide particles by H-2. X-ray photoelectron spectra (XPS) and Auger electron spectra (AES) results revealed that Cu+ species existed in Cu/Si-TiNbO5 catalysts and that the copper oxide species in Cu/Si-TiNbO5 catalysts after used for NO decomposition were different from those before the reaction. Well-dispersed copper oxide species were active for NO decomposition and the most active sites might be the dimeric copper oxide species over the support.

• 出版日期2002-1-10
• 单位南京大学