Mesoporous CeO2-ZrO2-based mixed oxides for automotive catalysis

6^th International Conference and Exhibition on Materials Science and Chemistry

May 17-18, 2018 | Rome, Italy

Anatoly Bortun, Mila Bortun, Yunkui Li, David Shepard, Geng Zhang, Sunhao, Tomas J Pinnavaja and Xudong Fan

PIDC, USA
Michigan State University, USA

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

New automotive emission standards make stringent requirements for oxygen-storage materials used in three way catalysts (TWC) and diesel catalysts. PIDC has developed an original precipitation technique for making wide range of ceriazirconia (CZ) compositions. The key feature of the novel process is a presence of certain organic and/or inorganic additives specifically interacting with polyvalent metals in aqueous solution. The dual role of additives has been found. They change primary particles charge and surface charge density. Also, they specifically interact with Zr(Ce) species by occupying or blocking some of their active sites, which prevents dense packing of primary particles and their aggregates. This allows tailored assembly of mixed oxide structural blocks throughout all stages of precipitation with the formation of open-framework hierarchical structures. Other synthetic steps � washing precipitate from ionic admixtures, drying, calcinations, etc., are also important for retaining and fixation of hydrogel open-framework structures. Based on experimental data optimal conditions for making mixed oxides with porosity that can be controlled and regulated in a broad range from 50-10 nm up to 60-100 nm and improved thermal stability up to 1100oC have been determined. Novel CZ materials exhibit high oxygen storage capacity and improved compatibility with precious metals. Results of CZ characterization with the use of different methods: XRD, SEM, TEM, N2 adsorption, TPR-H2, etc., will be presented.

Biography :

Anatoly Bortun has 20 years academy and 15 years industry experience with background in Physical and Inorganic Chemistry. His expertise is in areas of adsorption/ion exchange, separations and materials chemistry, including hydrothermal, sol-gel and solid state syntheses.
Email:abortun@pidc.com