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Case Study: Effect of Zirconium on the Textural and Catalytic Properties of Magnetite
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Author(s): Maria do Carmo Rangel (Universidade Federal da Bahia, Brazil & Universidade Federal do Rio Grande do Sul, Brazil), Amalia Luz Costa Pereira (Universidade Federal da Bahia, Brazil), Gustavo Marchetti (Universida Nacional de La Plata, Argentina), Peterson Santos Querino (Universidade Federal da Bahia, Brazil)and Alberto Albornoz (Instituto Venezolano de Investigaciones Científicas, Venezuela)
Copyright: 2018
Pages: 26
Source title:
Advanced Solid Catalysts for Renewable Energy Production
Source Author(s)/Editor(s): Sergio González-Cortés (Oxford University, UK)and Freddy Emilio Imbert (Univsersidad de Los Andes, Venezuela)
DOI: 10.4018/978-1-5225-3903-2.ch008
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Abstract
The effect of zirconium on the textural and catalytic properties of magnetite for the water gas shift reaction (WGSR) at high temperatures was studied in this chapter. The reaction is an important step in the industrial production of pure hydrogen. Samples with different amounts of zirconium (Zr/Fe (molar)= 0.1; 0.2;0.3; 0.4 and 0.5) were prepared from the decomposition of iron(III)hydroxoacetate doped with zirconium. It was found that zirconium increased the specific surface area of magnetite acting as spacer on the surface where it keeps the particles apart. Except for the zirconium-poorest solid, tetragonal zirconia was detected besides magnetite for all solids. Zirconium increased the intrinsic activity of the catalysts, stabilized the specific surface areas during reaction, and made the magnetite reduction to metallic iron more difficult. The zirconium-poorest is more active than magnetite and more resistant against deactivation by sintering and overreduction being attractive for WGSR.
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