Effect of temperature on the sintering behavior of CeO2-La2O3 doped with silicate

Caio Daniel Barros de Alecrim, Jorge Luís Marques Garcia, Luiz Francisco dos Santos Neto, Olyverson Lyra Porto, Juliana Pereira Flor, Catia Fredericci


This paper evaluates the sintering behavior of CeO2-La2O3-silicate at different temperatures. The sintered compact of this system may be a candidate to be used as a refractory lining for biomass (sugarcane bagasse) gasifier. The raw material (CeO2-La2O3-silicate powder) was
characterized by granulometric distribution, differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and dilatometry. Cylindrical compacts of this powder were heat treated at 1200 ºC, 1300 ºC and 1400 ºC for 1 h and characterized by X-ray diffraction (XRD), micro Raman spectroscopy, SEM/EDS, shrinkage and apparent porosity. The results show that the sintering degree of the samples increases with temperature, reaching shrinkage of about 16 % and apparent porosity of 3.5 % at 1400 ºC. The XRD and Raman spectroscopy results revealed that a cerium/ lanthanum silicate was formed which is stable against melting at temperature as high as 1400 ºC. The study of the reactivity of the bagasse ash and the CeO2-La2O3-silicate refractory will be presented in a future publication.

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BENNETT, J. P.; KWONG, K-S. Failure mechanism in high chrome oxide gasifier refractories. Metallurgical and Materials Transactions A, v. 42A, n. 4, p. 888-904, Apr. 2011.

CHADDOCK, J. Refractory for Black Liquor Gasifiers. Washington, DC: US Department of Energy, 2006. p. 1. (Energy Efficiency and Renewable Energy – Biomass Program).

COMAS, C. C. Brasil é o maior produtor mundial de cana-de-açúcar. Neo Mundo, June, 21 2018. Available in:. . Accessed in: Nov. 4 2018.

FREDERICCI, C.; CRUZ, I. A.; RIBEIRO, T. R.; FUKUHARA, T. Y. Corrosão de refratário à base de Al2O3 por cinza de cana de açúcar em atmosfera redutora. In: CONGRESSO BRASILEIRO DE CERÂMICA,

, 2016, Águas de Lindóia. Anais... São Paulo: Associação Brasileira de Cerâmica, 2016. p. 1-12.

FREDERICCI, C.; ETT, G.; SILVA, G. F. B. L.; FERREIRA NETO, J. B.; LANDGRAF, F. J. G.; INDELICATO, R. L.; RIBEIRO, T. R. An analysis of Brazilian sugarcane bagasse ash behavior under thermal gasification. Chemical and Biological Technologies in Agriculture, p. 1-15, Dec. 2014.

FREDERICCI, C.; MENOSSI, M.S.; CRUZ, I.A.; INDELICATO, R.L. - Corrosão de refratários à base de Cr2O3 e Al2O3 por cinza de cana de açúcar. In: CONGRESSO BRASILEIRO DE CERÂMICA, 59, 2015,

Barra do Coqueiros. Anais... São Paulo: Associação Brasileira de Cerâmica, 2015. p. 1-12.

FREDERICCI, C.; RIBEIRO, T. R. Corrosão de refratários à base de ZrO2 por cinza de cana-de-açúcar em atmosfera redutora. In: CONGRESSO BRASILEIRO DE CERÂMICA, 61., 2017, Gramado. Anais... São Paulo: Associação Brasileira de Cerâmica, 2017. p. 1-12

HUTCHISON, C. A. Microstructure and corrosion intermediate level wasteforms fabricated using novel thermal techniques. 2017. 223 f. Thesis – Department of Materials, Imperial College London, London, 2017.

KEPINSKI, L.; MISTA, W.; OKAL, J.; DROZD, M.; MACZKA, M. Interfacial reactions and silicate formation in high surface SiO2 impregnated with La nitrate. Solid State Sciences, v. 7, p. 1300–1311, 2005.

KOBAYASHI, W. T.; DA SILVA, E. L.; PASKOCIMAS, C.A. US Patent 6,455,102 B1: Method for producing corrosion prevention. 2002. p. 1-9.

LIANG, S.; BROITMAN, E.; WANG, Y.; CAO, A.; VESER, G. Highly stable, mesoporous mixed lanthanum–cerium oxides with tailored structure and reducibility. Journal of Materials Science,

v. 46, p. 2928-2937, 2011.

MONTORO, S. R.; SHIINO, M. Y.; CRUZ, T. G; CIOFFI, M. O. A.; WOORWALD, H. J. C. Influence of voids oh the flexural resistance of the NCF/RTM6 composite. Procedia Engineering, v. 10, p. 3220-3225, 2011.

OMBERG, O. S. Techno-economical evaluation of suitable conversion technology for the production of biofuels from wood biomass. 2015. 116 f. Thesis - Faculty of Environmental Science and Technology, Norwegian University of Life Sciences, Akershus, 2015.

PERRONE, C.C.; APPEL, L.G.; MAIA LELLIS, G.L.; FERREIRA, F.M.; DE SOUSA, A.M.; FERREIRALEITÃO, V.S. Ethanol: an evaluation of its scientific and technological development and network of

players during the period of 1995 to 2009. Waste Biomass Valor, v. 2, n. 1, p. 17-32, Feb. 2010.

REDDY, B.M.; KHAN, A.; LAKSHMANAN, P. Structural Characterization of Nanosized CeO2-SiO2, CeO2-TiO2, and CeO2-ZrO2 Catalysts by XRD, Raman, and HREM Techniques. Journal of Physical Chemistry B, v. 109, p. 3355-3363, 2005.

THEVENIN, G.; POIRIER J.; PRIGENT P.; FOURCAULT A.; J. P. ROBERT-ARNOUIL J. P.; EDME E.; MARIAS F.; DEMARTHON R. Modelling and design of a refractory lining for a biomass gasification reactor

fed by a plasma torch. Waste and Biomass Valorization, v. 5, n. 5, p. 865-877, Oct. 2014.

WEIMMERSKIRCH-AUBATIN, J.; STOFFEL, M.; BOUCHÉ, A.; VERGNAT, M.; RINNERT, H. Optical properties of Ce-doped SiO2 films: From isolated Ce3+ ions to formation of cerium silicate. Journal of Alloys and Compounds, v. 622, p. 358–361, Feb. 2015.


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