3. Date of birth:04/5/1986 4. Place of birth: Hai Phong
5. Admission decision number: No 2875/QĐ-ĐHKHTN dated on 07/8/2015 by Rector of VNU University of Science.
6. Changes in academic process: None
7. Official thesis title: “Investigation of the selective oxidation of benzyl alcohol on sepiolite supported transition metal oxides”
8. Major: Petrochemistry 9. Code: 62440115
10. Supervisors: 1) Assoc. Prof. Dr. Nguyen Tien Thao
2) Prof. Dr. Sc. Ngo Thi Thuan
11. Summary of the new findings of the thesis
The structure of sepiolite and the nature of transition metal oxides have strongly affected the catalytic activity in the oxidation reaction of benzyl alcohol.
+ Cr (III) ions in sepiolite tunnels are stabilized and play an important role in the selective oxidation of benzyl alcohol to benzaldehyde.
+ Cr (III) species on the surface and in the open tunnels of sepiolite decompose t-BuOOH into t-BuO. or t-BuOH. radicals and the oxidation reaction of benzyl alcohol occurs in a free radical mechanism.
The catalytic stability of Cr2O3 catalyst is enhanced by the decomposition of Cr(OH)3 at higher temperature in tunnels and channels of sepiolite. The deposition of Cr2O3 oxide nanoparticles in the channels and tunnels leads to stabilize the catalytic stability during oxidation process. The reaction mechanism of benzyl alcohol oxidation on Cr/sepiolite catalysts was postulated.
Comparative activity of MeOx-10/sepiolite catalyst series in the oxidation of benzyl alcohol has been performed. The results show that the catalytic activity exhibits in the order of CrOx-10/sepiolite > CoOx-10/sepiolite > CuO-10/sepiolite > MnOx-10/sepiolite > NiO-10/sepiolite for oxidation of liquid phase benzyl alcohol under the same preparation and reaction conditions. The chromium oxide exhibited the highest activity while nickel oxide exhibited the lowest oxidation catalytic activity in the present report.
12. Practical applicability, if any:
Transition metal oxides-supported sepiolite catalysts would be used as a catalyst for the oxidation of benzyl alcohol with t-BuOOH resulting in a high selectivity of benzaldehyde. This product is a valuable chemical for pharmaceutical industries, aromatics, dyes, agrochemicals, cosmetics and chemicals.
13. Further research directions, if any:
Developing the study denatured sepiolite and then using denatured sepiolite as the carrier for transition metal oxides to investigate the oxidation reaction of alkyl benzene.
14. Thesis-related publications:
1. Nguyen Tien Thao, Nguyen Thi Nhu, Kuen-Song Lin (2018), “Liquid phase oxidation of benzyl alcohol to benzaldehyde over sepiolite loaded chromium oxide catalysts”, Journal of the Taiwan Institute of Chemical Engineers 83, 10–22, IF: 4.22, https://doi.org/10.1016/j.jtice.2017.11.034 (SCI, Q1)
2. Nguyen Tien Thao, Nguyen Thi Nhu (2018), Evaluation of Catalytic Activity of MeOx/sepiolite in Benzyl Alcohol Oxidation, Journal of Science: Advanced Materials and Devices, 02 (2018) pp.xx-xx (ISI, Scopus)
3. Nguyễn Thị Như, Trần Quyết Thắng, Nguyễn Tiến Thảo (2017), “Hoạt tính xúc tác của CuO/sepiolite trong phản ứng oxi hóa pha lỏng ancol benzylic”, Tạp chí Xúc tác và Hấp phụ Việt Nam, T6. (No2), Tr.131-134, 2017.
4. Nguyen Thi Nhu, Pham Hoang Giang, Nguyen Tien Thao (2017), “Investigation of oxidation between benzyl alcohol and TBHP on CoO-loading sepiolite – catalysts”, Vietnam Journal of Chemistry, 55(4E23) 289 – 293. DOI: 10.15625/2525-2321.2017-00534
5. Nguyen Thi Nhu, Quach Toan Anh, Nguyen Tien Thao (2017), “Oxidation of benzyl alcohol to benzanđehit over MnOx/sepiolite catalysts” , Vietnam Journal of Chemistry, 55(6) 729-733. DOI: 10.15625/2525-2321.2017-00534
6. Nguyen Tien Thao, Nguyen Thi Nhu, Ngo Thi Thuan (2018), “Catalytic activity of Cr2O3/sepiolite in the oxidation benzyl alcohol”, Vietnam Journal of Science and Technology, 56 (3) (2018) 295-302. DOI: 10.15625/2525-2518/56/3/10930.
