Results 121 to 130 of about 1,161 (179)

Hydrodeoxygenation of Guaiacol over Ceria–Zirconia Catalysts

ChemSusChem, 2015
AbstractThe hydrodeoxygenation of guaiacol is investigated over bulk ceria and ceria–zirconia catalysts with different elemental compositions. The reactions are performed in a flow reactor at 1 atm and 275–400 °C. The primary products are phenol and catechol, whereas cresol and benzene are formed as secondary products.
Sarah M, Schimming, Onaje D, LaMont, Michael, König, Allyson K, Rogers, Andrew D, D'Amico, Matthew M, Yung, Carsten, Sievers   +6 more
openaire   +2 more sources

Kinetics of hydrogen activation on ceria–zirconia

Journal of Catalysis, 2015
Abstract Ceria–zirconias are popular catalysts and supports for metal particles. Even without supported metal particles, these materials are active for hydrogenation and hydrodeoxygenation reactions, where oxygen vacancies serve as the active site.
Sarah M. Schimming, Guo Shiou Foo, Onaje D. LaMont, Allyson K. Rogers, Matthew M. Yung, Andrew D. D’Amico, Carsten Sievers   +6 more
openaire   +1 more source

Cutting tool application of ceria-zirconia

Journal of the European Ceramic Society, 1993
Abstract Transformations between the tetragonal and monoclinic phases of stabilized zirconia, popularly known as transformation toughening, have been widely studied. The transformation response of these phases to temperature and stress are quite different and hence their transformation response to an environment such as metal cutting, where both ...
V.E. Annamalai, T. Sornakumar, C.V. Gokularathnam, R. Krishnamurthy   +3 more
openaire   +1 more source

Synthesis of mesoporous ceria zirconia beads

Microporous and Mesoporous Materials, 2007
Abstract A complete range of mesoporous Ce 1− x Zr x O 2 beads ( x  = 0–1) were synthesized by the nanocasting approach using porous polymeric beads as templates and crystalline Ce 1− x Zr x O 2 nanoparticle sols as filling agent. The final beads obtained after calcination at 500 °C showed surface areas as large as 113 m 2  g −1 .
Deshpande, A., Niederberger, M.
openaire   +2 more sources

Redox Behaviour of a Ceria Zirconia Alloy

1989
The thermal history of ceria zirconia solid solutions greatly influences their structure and properties, particularly their electric conductivity. This in turn depends on a reversible redox reaction here investigated by means of TG, DTA and TDM measurements.
SERGO, VALTER, SCHMID, CHIARA, MERIANI S.   +2 more
openaire   +2 more sources

Mechanical properties in the ceria-zirconia system

Journal of the European Ceramic Society, 1992
Abstract The room temperature mechanical properties of samples ranging through the whole zirconia-ceria system have been determined and related to the phases present in order to establish the influence of crystallographic parameters on the material properties.
S. Maschio, O. Sbaizero, S. Meriani
openaire   +1 more source

Evidence for Entropy Effects in the Reduction of Ceria−Zirconia Solutions

Chemistry of Materials, 2006
An instrument for Coulometric-titration measurements was built and used to measure the thermodynamic redox properties for a 10 wt % Cu/silica catalyst at 973 K and for two ceria-zirconia solid solutions, Ce 0.81Zr 0.19O 2 and Ce 0.25Zr 0.75O 2, between 873 and 1073 K.
SHAH P. R, KIM T, ZHOU G, FORNASIERO, Paolo, GORTE R. J.   +4 more
openaire   +2 more sources

Nickel-Based Ceria, Zirconia, and Ceria–Zirconia Catalytic Systems for Low-Temperature Carbon Dioxide Reforming of Methane

Energy & Fuels, 2007
Carbon dioxide reforming of methane (CDRM) was studied over a variety of ZrO2-, ceria-doped ZrO2-, and CeO2–ZrO2-supported Ni catalysts. Different techniques were used to prepare supports material having different physicochemical properties, and a correlation was established to show the importance of a robust support material.
Prashant Kumar, Yanping Sun, Raphael O. Idem   +2 more
openaire   +1 more source

Thermally induced changes in the ceria zirconia system

Thermochimica Acta, 1988
Abstract The redox behaviour of ceria zirconia alloy (50 mol %) has been investigated by thermoanalytical methods under controlled atmospheres (air, oxygen and argon with 5% hydrogen). The supposed non-stoichiometry (CeOx-ZrO2, x being a function of oxygen pressure and temperature) is proved by weight changes which are accompanied by volume ...
A. Magistris, G. Chiodelli, V. Sergo, S. Meriani   +3 more
openaire   +3 more sources

Synthesis of nanostructured ceria, zirconia and ceria–zirconia solid solutions using an ultrahigh surface area carbon material as a template

Nanotechnology, 2004
Nanostructured ceria, zirconia and ceria-zirconia solid solutions have been synthesized via an easy route and characterized by XRD, nitrogen physorption, Raman spectroscopy and TEM. The route involves two steps: the impregnation of ultrahigh surface area carbon materials with nitrate solutions of ceria and/or zirconia and burn-off to remove the carbon ...
Changhai Liang, Jieshan Qiu, Zhonglai Li, Can Li   +3 more
openaire   +1 more source