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

摘要: Abstract A series of silica-pillared layered titanoniobate supported copper catalysts (Cu/Si-TiNbO 5 ) were prepared for the direct decomposition NO. It was found that Cu/Si-TiNbO highly active reaction NO (0.1 vol.% in He) space velocity range 3000–30,000 cm 3  g −1  h . The 3.5 wt.% catalyst showed highest conversion into N 2 decomposition. While 2.0 wt.% had specific activity at low temperature (≤550°C) and 1.0 wt.% high (>550°C). XRD temperature-programmed reduction (TPR) results indicated there existed well-dispersed oxide species large particles catalysts. Well-dispersed reduced more easily than by H X-ray photoelectron spectra (XPS) Auger electron (AES) revealed Cu + after used different from those before reaction. most sites might be dimeric over support.