title: Aged nano-structured platinum based catalyst: effect of chemical treatment on adsorption and catalytic activity.
abstract: To examine the effect of chemical treatment on the adsorption and catalytic activity of nanostructured platinum based catalyst, the aged commercial Pt/AC catalyst was pretreated with sulfuric acid (H2SO4) and a cleaning agent (Hexane). Several reliable methods such as nitrogen adsorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and inductively coupled plasma (ICP) were employed to characterize the aged Pt/AC catalyst and its chemically pretreated Pt/AC catalysts. The catalytic and adsorption activities of nano-structured heterogeneous Pt/AC catalyst were investigated on the basis of toluene oxidation and adsorption isotherm data. In addition, the adsorption isotherms of toluene were used to calculate the adsorption energy distribution functions for the parent catalyst and its pre-treated nano-structured Pt/AC catalysts. It was found that sulfuric acid aqueous treatment can enhance the catalytic performance of aged Pt/AC catalyst toward catalytic oxidation of toluene. It was also shown that a comparative analysis of the energy distribution functions for nano-structured Pt/AC catalysts as well as the pore size distribution provides valuable information about their structural and energetic heterogeneity.
authors: School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea.
authors: Wang Geun
authors: WG
authors: Shim
authors: Seung Won
authors: SW
authors: Nahm
authors: Hyuk Ryeol
authors: HR
authors: Park
authors: Hyung Sun
authors: HS
authors: Yun
authors: Seong Gyu
authors: SG
authors: Seo
authors: Sang Chai
authors: SC
authors: Kim