RESUMEN
The AgCl/Al2O3 catalyst has potential for use in the selective catalytic reduction (SCR) of NO(x). A compound hydrocarbon, following oxygenation is used as a type of reducing agent. In this experiment, the AgCl/Al2O3 catalyst was produced by four different methods, and the differences among their reduction catalysis of NO(x) were compared. Ethanol was used as a type of reducing agent. X-ray diffraction analysis was performed to study the crystalline structure and scanning electron microscope and transmission electron microscope (TEM) were applied to determine the microindentation. The results indicated that, in the range of 350-400 degrees C, there was no significant difference on the NO(x) reduction rate; however, there was dispersion at high and low temperature ranges. The size of the AgCl particles was about 20-100 nm.
Asunto(s)
Óxido de Aluminio/química , Óxido Nítrico/química , Compuestos de Plata/química , Catálisis , Cristalización , Microscopía Electrónica , Oxidación-Reducción , Tamaño de la Partícula , Espectroscopía de Fotoelectrones , Difracción de Rayos XRESUMEN
The γ-Al203 and AgCl/Al203 catalyst powder were coated on a stainless steel substrate by dip coating and electrophoretic deposition method. And AgCl/Al203 catalyst was produced by three kinds of methods, and the difference between the NOx reduction catalysis of the coated sample was compared. XRD and SEM were used to study the crystalline structure and cross-section of the coatings. The coating of γ-Al203 with the thickness of 3-5 µm and AgCl/Al203 catalyst with the thickness of 5-9 µrn were made on the surface of SUS304 plate without exfoliation. The NOx conversion of the coated sample with catalyst was about 70% at the maximum.
Asunto(s)
Óxido de Aluminio/química , Compuestos de Plata/química , Acero Inoxidable/química , Catálisis , Microscopía Electrónica de Rastreo , Difracción de Rayos XRESUMEN
γ-Al2O3 coatings were prepared on aluminum-free stainless steel (SUS304) by electrophoretic deposition method. Both X-ray diffraction and scanning electron microscopy were used to study the crystalline structure and morphological features of the coatings. Themo gravimetry-differential termal analysis (TG-DTA) is used to study the thermo-chimerical reaction behavior of coatings. Catalytic activity of coatings is determined by degrading of NOx. The results indicated that the thickness of the coatings onto SUS304 could reach 5 µm without any exfoliation at optimized conditions. Catalytic properties of samples coated by electrophoretic deposition method were highly enhanced as compared with that of samples prepared by the dip coating method.