Key properties of mixed cerium and zirconium microspheres prepared by the internal gelation process with previously boiled HMTA and urea

Hunt, Rodney Dale; Collins, Jack Lee; Choi, Jae-Soon

doi:10.1016/j.ceramint.2021.05.042

Key properties of mixed cerium and zirconium microspheres prepared by the internal gelation process with previously boiled HMTA and urea

Journal Article · Sun May 09 00:00:00 EDT 2021 · Ceramics International

DOI:https://doi.org/10.1016/j.ceramint.2021.05.042· OSTI ID:1814386

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
LG Chem, Daejeon (South Korea)

The internal gelation process using previously boiled hexamethylenetetramine-urea was used in exploratory study to produce CeO₂–ZrO₂ microspheres, which can serve as a simulant for ceramic transuranic fuel particles and as a viable three-way catalyst. The calcined CeO₂ and ZrO₂ microspheres with Barrett–Joyner–Halenda (BJH) pore size and volumes of 8–10 nm and 0.19–0.20 mL/g, respectively, had many more surface cracks than their relatively smooth CeO₂–ZrO₂ counterparts even though the BJH pore sizes and volumes of mixed oxide spheres were lower at 3 nm and 0.11–0.12 mL/g, respectively. The Brunauer–Emmett–Teller (BET) surface areas for the CeO₂ and ZrO₂ microspheres were 74 and 93 m2/g, respectively, and the BET surface areas for the mixed oxides were much greater at 155–158 m²/g, which should improve catalytic performance. Overall, the catalytic activity of each microsphere composition was confirmed through the oxidation of carbon monoxide.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1814386

Journal Information:: Ceramics International, Journal Name: Ceramics International Journal Issue: 16 Vol. 47; ISSN 0272-8842

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
CeO2-ZrO2 microspheres
three-way catalyst
transuranic simulant

Key properties of mixed cerium and zirconium microspheres prepared by the internal gelation process with previously boiled HMTA and urea

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References (13)

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