碳纳米管-氧化铝:高抗硫及再生性能的Pt基催化剂载体及在NO_x还原反应中的应用(英文)

Alumina-carbon nanotube supports for sulfur-resistant regenerable Pt-based catalysts in NO_x reduction

通过乙炔在Al2O3上的分解制备碳纳米管-氧化铝(Al2O3-CNTs)载体.采用浸渍法,分别制备了Pt/Ba/Al2O3-CNTs和Pt/Ba/Al2O3催化剂.利用XRD,SEM,TEM,低温N2物理吸附,XPS和in-situ DRIFTS等手段对催化剂的物化性质进行了表征.结果表明,在SO2存在下的NOx还原反应中,Pt/Ba/Al2O3-CNTs比Pt/Ba/Al2O3具有更高的抗SO2性能和再生性能.In-situ DRIFTS表明SO2的存在对NOx储存还原的途径没有影响.

Alumina-carbon nanotube (Al2O3-CNT) supports were prepared by the decomposition of acetylene on Al2O3. The subsequent impregnation of Pt and Ba yielded Pt/Ba/Al2O3-CNT. Pt/Ba/Al2O3-CNT was characterized by X-ray diffraction, scanning and transmission electron microscopies, N2 phy-sisorption, X-ray photoelectron spectroscopy, and in-situ diffuse reflectance infrared Fourier trans-form spectroscopy (DRIFTS). The relationship between the structure and properties of Pt/Ba/Al2O3-CNT was investigated. Pt/Ba/Al2O3-CNT exhibited much higher resistance to SO2 poi-soning and better regeneration ability than Pt/Ba/Al2O3, during NOx reduction in the presence of SO2. In-situ DRIFTS spectra suggested that SO2 had no effect on the NOx storage and reduction pro-cess.