XIE Youchang (谢有畅) Physical Chemistry Tel(Home):(8610)62752338, Fax: (8610)62751725, E-mail: yxie@pku.edu.cn

Professor (born 1934); B.S. Sun Yetsen University(1953); M.S. Peking University(1957); Visiting professor, University of California, Berkeley(1984-1985). Awarded Outstanding Contribution Specialist by Chinese Government(1990). Selected publications: Youchang Xie and Youqi Tang, Adv. Catal, 37,1 (1990). "Spontaneous Monolayer Dispersion of Oxides and Salts onto surfaces of Supports: Application to Heterogeneous Catalysis". Youchang Xie, Jiaping Zhang, Jianguo Qiu, Xianghong Tong and Youqi Tang, et.al. Adsorption 3, 27-32 (1996). "Zeolites Modified by CuCl for Separating CO from Gas Mixtures Containing CO2". Kaixuan Wang, Guang Yu, Biying Zhao and Youchang Xie, XVth Int. Conf. Raman Spectroscopy, Pittsburgh, 1110 (1996). "Raman Spectroscopy Studies on Shape-Selectivity Catalysts of Sb2O3/HZSM-5". Youqi Tang, Youchang Xie and Linlin Gui, Adv. in Nature Science (Chinese ed.) 4, 6, (1994) 642. "Spontaneous Monolayer Dispersion of Oxides and Salts onto surface of Supports and Its Applications". Wang Chun-Bao, Xie You-Chang and Tang You-Qi, Science in China, Series B 37, 12 (1994) 1438. "The kinetics and Mechanism of Spontaneous Dispersion of Ionic Compounds onto Surface of Supports". Youchang Xie, Xiaohai Cai, Zhiwei Liu, Xiaoqian Chai, Zhiguo Ren and Youqi Tang, 11th Int. Congr. Catal (1996), P0-133. "Study on the Surface Structure of Monolayer Dispersed Oxides and Salts on Supports by EXAFS". Xie Youchang and Tang Youqi et.al. U.S. Patent, 4917711 (1990). "Adsorbents for Use in the Separation of Carbon Monoxide and/or Unsaturated Hydrocarbons from Mixed Gases".

Our research interests focus on the surface and interface chemistry of solid state materials with the emphasis on relationships among properties, structures and preparations. We are particularly interested in those porous materials with unusual large surface area and nanoparticles, which may have the applications to catalysts, adsorbents, batteries, as well as advanced ceramics materials. We study the syntheses, modifications, characterizations and properties of these materials. We have developed some practical new methods of preparing porous metal oxides with unusual large surface area and nanoparticles of metal oxides with narrow particle distribution. A novel refractory composite oxide catalyst with large surface area and high activity for oxidation of CO and hydrocarbons has been obtained in our laboratory recently. It shows a great potential for air pollution control. We have also prepared Y2O3 doped ZrO2 nanoparticles at very low sintering temperature (1200(C). It may be a good candidate for nanoceramics with high strength and interesting plastic property. We have found that many solid compounds can disperse spontaneously onto the surface of solids to form a monolayer or submonolayer. The surface properties of porous materials and nanoparticles can be modified by monolayer-dispersed compounds. Some high efficient adsorbents for gas separation and petrochemical catalysts have been developed by modification of porous materials and zeolites via monolayer dispersion of suitable compounds. For the characterizations and structural studies of those porous materials and nanopaticales, techniques such as XRD, XPS, ISS, EXAFS, TEM, STM, AFM, IR, Raman, and M"ssbauer spectra etc. are used.