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Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides

Mutinda, Samuel I
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332

Abstract Details

2013, Master of Science in Chemistry, Youngstown State University, Department of Chemistry.
A low energy band gap between Ce3+ and Ce4+ states in cerium oxide along with its high oxygen mobility and high oxygen storage capacity are properties that qualify it as one of the most widely used heterogeneous catalysts and catalyst oxide supports. This thesis report is an account of studies that were carried out on the synthesis and catalytic properties of pure, metal-doped and noble-metal impregnated cerium oxide nanoparticles. Our results revealed that synthesis temperature, during hydrothermal reactions, plays a critical role in controlling the shape, size, oxygen vacancy concentration, and low temperature reducibility in CeO2 nanoparticles. In addition, OH- ion concentration was found to play an important role in engineering the lattice constants and oxygen vacancy concentrations of ceria nanoparticles within the same particle morphology and synthesis temperature. Secondly, our studies demonstrated that hydrothermal synthesis is a facile one-step approach to the preparation of compositionally homogeneous CexZr1-xO2 (0≤x&≤1) nanocrystals, in which CeO2-ZrO2 mixed oxides present a superior low-temperature oxygen release capability compared to pure CeO2. The Ce0.5Zr0.5O2 system proved to have good thermal stability up to 1000oC under reducing and oxidizing atmosphere. We have also seen that at above 1000oC, phase transformation occurs from psudocubic to cation ordered pyrochlore or tetragonal phase under reducing and oxidizing atmosphere, respectively. This method may be easily extended to other cerium-based mixed oxides or synthesis of analogous mixed oxides. Lastly, our results established that the impregnation of 1 wt. % platinum and gold on CeO2 nanorods and on nanocubes causes an enhanced reduction on their surface reduction temperatures with negligible effect on their bulk reducibility. It was also shown that both pure and impregnated CeO2 nanorods have a lower surface reduction temperature compared to that of pure and impregnated CeO2 nanocubes. We have also demonstrated that gold nanoparticles proved to have a higher catalytic performance in oxidizing molecular hydrogen at low temperatures as compared to platinum nanoparticles.
Wang Ruigang , Ph.D. (Advisor)
Timothy Wagner, Ph.D. (Committee Member)
Cameron Lovelave, Ph.D. (Committee Member)
109 p.
Chemical Engineering; Chemistry; Materials Science
Cerium oxide, Hydrothermal synthesis, Low-temperature reducibility, Oxygen storage capacity, Morphology control, Noble metal nanoparticles

Recommended Citations

Citations

  • Mutinda, S. I. (2013). Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332

    APA Style (7th edition)

  • Mutinda, Samuel. Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides. 2013. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332.

    MLA Style (8th edition)

  • Mutinda, Samuel. "Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides." Master's thesis, Youngstown State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Youngstown State University and OhioLINK.