caa a22 4500 463170105 CHVBK 20180406164810.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10450-007-9052-2 doi (NATIONALLICENCE)springer-10.1007/s10450-007-9052-2 Effect of preparative conditions on the surface characteristics ofmixed zirconium and titanium oxides [Elektronische Daten] [Adham Ramadan, Nahed Yacoub, Sofi Bahgat, Jehane Ragai] The surface characteristics of mixed zirconium and titanium oxides prepared from different starting materials are investigated. One mode of preparation entailed the use of zirconium sulfate and titanium oxysulfate as starting materials and ammonium hydroxide as precipitating agent. The produced oxides were washed to different extents to obtain samples with different sulfate content. Asecond preparative mode used zirconium oxychloride and titanous chloride as starting materials also with ammonium hydroxide as precipitating agent. The oxidation of the titanous to the titanic form for these oxides was carried out by means of oxygen gas. Resulting samples were heat treated at 400 °C and 600 °C, and textural characteristics determined from the adsorption of N2 at 77K, complemented by infrared and thermal studies. The samples precipitated from the oxychloride and chloride salts of zirconium and titanium, as well as those precipitated from the sulfate and oxysulfate salts and washed free of the sulfate ions displayed quite similar textural characteristics. The unheated samples and those heat-treated at 400 °C were mesoporous, with some microporosity, and relatively large surface areas in the order of 200-300m2/g. Heat treatment to 600 °C led to a relative decrease in surface area, in the order of 100m2/g, and to the disappearance of microporosity. The mixed zirconium and titanium oxides with a sulfate content of ≈17% displayed significantly lower surface areas, smaller than 10m2/g, with a prevalence of micro and mesoporosity. Infrared and thermal studies indicated the presence of differently bounded sulfato groups, which seem to have a blocking effect on the pores, resulting in the observed smaller surface areas. Springer Science+Business Media, LLC, 2007 Mixed oxides nationallicence Titanium oxide nationallicence Zirconium oxide nationallicence Surface area nationallicence Porosity nationallicence Ramadan Adham Department of Chemistry, The American University in Cairo, Cairo, Egypt aut Yacoub Nahed Department of Chemistry, The American University in Cairo, Cairo, Egypt aut Bahgat Sofi Department of Chemistry, The American University in Cairo, Cairo, Egypt aut Ragai Jehane Department of Chemistry, The American University in Cairo, Cairo, Egypt aut Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 291-297 0929-5607 13:3-4<291 2007 13 10450 https://doi.org/10.1007/s10450-007-9052-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10450-007-9052-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ramadan Adham Department of Chemistry, The American University in Cairo, Cairo, Egypt aut NATIONALLICENCE 700 1- Yacoub Nahed Department of Chemistry, The American University in Cairo, Cairo, Egypt aut NATIONALLICENCE 700 1- Bahgat Sofi Department of Chemistry, The American University in Cairo, Cairo, Egypt aut NATIONALLICENCE 700 1- Ragai Jehane Department of Chemistry, The American University in Cairo, Cairo, Egypt aut NATIONALLICENCE 773 0- Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 291-297 0929-5607 13:3-4<291 2007 13 10450 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer