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- Title
HYDROTHERMAL AND SOLVOTHERMAL SYNTHESIS OF CERIUM-ZIRCONIUM OXIDES FOR CATALYST APPLICATIONS.
- Authors
Machmudah, Siti; Ceaser, Muhamad Risky; Alwajdy, Muhammad Fareid; Widiyastuti; Winardi, Sugeng; Wahyudiono; Hideki Kanda; Motonobu Goto
- Abstract
Cerium oxide (CeO2) is a rare earth metal oxide that has high oxygen storage capacity at low temperature. In order to enhance this capacity, as well as its thermal stability, it is necessary to combine CeO2with zirconium oxide (ZrO2). This work focuses on the synthesis of cerium-zirconium oxides by hydrothermal and solvothermal treatment at low temperature to obtain ones suitable for catalyst applications. The possibility of the application of ceria-zirconia oxide to the delignification reaction was investigated. The experiments were conducted at a constant pressure of 5 MPa, constant temperature of 150oC, and constant synthesis time of 2 h, in an autoclave reactor made of SUS 316 with an internal volume of 100 mL. Precursor was prepared from Ce(NO3)3and ZrO(NO3)2 at 0.06 M concentration, dissolved in various solvents. The solvents used were water, water/ethanol (70:30 vol/vol), and water/ethylene glycol (70:30 vol/vol). After hydrothermal and solvothermal synthesis, the colloid products were dried at 60oC for 6 h and then calcined at 500oC for 6 h. The characterizations of the particle products were analyzed using SEM and XRD. Furthermore, these products were used for the hydrothermal delignification process of wood biomass. The addition of ceria-zirconia particles dramatically increased the percentage of lignin removal from rapeseed wood up to 97.58%. Based on the results, ceria-zirconia oxide particles are effective for the pre-treatment of wood biomass in bio-refinery applications. Moreover, ceria-zirconia oxides may reduce the use of chemical compounds in the delignification process.
- Subjects
RARE earth oxides; HYDROTHERMAL synthesis; LIGNINS; CERIUM oxides; ZIRCONIUM oxide; ETHYLENE glycol; OXIDE synthesis
- Publication
International Journal of Technology, 2019, Vol 10, Issue 3, p582
- ISSN
2086-9614
- Publication type
Article
- DOI
10.14716/ijtech.v10i3.2930