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)

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 supports for sulfur-resistant regenerable Pt-based catalysts in NOx reduction

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 physisorption, X-ray photoelectron spectroscopy, and in-situ diffuse reflectance infrared Fourier transform 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 poisoning and better regeneration ability than Pt/Ba/Al₂O₃, during NO_x reduction in the presence of SO₂. In-situ DRIFTS spectra suggested that SO₂ had no effect on the NO_x storage and reduction process.