tailieunhanh - Báo cáo hóa học: "Influence of Rare Earth Doping on the Structural and Catalytic Properties of Nanostructured Tin Oxide"

ITuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: nfluence of Rare Earth Doping on the Structural and Catalytic Properties of Nanostructured Tin Oxide | Nanoscale Res Lett 2008 3 194-199 DOI S11671-008-9135-3 NANO EXPRESS Influence of Rare Earth Doping on the Structural and Catalytic Properties of Nanostructured Tin Oxide Humberto V. Fajardo Elson Longo Luiz F. D. Probst Antoninho Valentini Neftali L. V. Carreno Michael R. Nunes Adeilton P. Maciel Edson R. Leite Received 3 March 2008 Accepted 7 May 2008 Published online 28 May 2008 to the authors 2008 Abstract Nanoparticles of tin oxide doped with Ce and Y were prepared using the polymeric precursor method. The structural variations of the tin oxide nanoparticles were characterized by means of nitrogen physisorption carbon dioxide chemisorption X-ray diffraction and X-ray photoelectron spectroscopy. The synthesized samples undoped and doped with the rare earths were used to promote the ethanol steam reforming reaction. The SnO2-based nanoparticles were shown to be active catalysts for the ethanol steam reforming. The surface properties such as surface area basicity base strength distribution and catalytic activity selectivity were influenced by the rare earth doping of SnO2 and also by the annealing temperatures. Doping led to chemical and micro-structural variations at the surface of the SnO2 particles. Changes in the catalytic H. V. Fajardo H E. Longo Instituto de Quimica de Araraquara Departamento de Bioquimica e Tecnologia Quimica Universidade Estadual Paulista Rua Francisco Degni s n Quitandinha 14801-907 Araraquara SP Brasil e-mail hfajardoufsc@ hfajardo@ L. F. D. Probst Departamento de Quimica Universidade Federal de Santa Catarina 88040-900 Florianopolis SC Brasil A. Valentini Departamento de Quimica Analitica e Fisico-Quimica Universidade Federal do Ceara 60451-970 Fortaleza CE Brasil N. L. V. Carreno M. R. Nunes Departamento de Quimica Analitica e Inorganica Universidade Federal de Pelotas 96010-900 Capao do Leao RS Brasil A. P. Maciel E. R. Leite Departamento de Quimica Universidade Federal de Sao Carlos 13560-905 Sao Carlos