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1. Full name: Nguyen The Huu
2. Sex: Male
3. Date of birth: 20-10-1978
4. Place of birth: Yen Bai
5. Admission decision number: 1891/SĐH Dated: 31/12/2007
6. Changes in academic process: Decision No. 2711/QĐ-SĐH dated 31/12/2008 by president of the University of Natural Sciences on the adjustment of names of doctoral thesis.
7. Official thesis title: Study on synthesis of metal oxides based catalysts for oxidation process of toluene.
8. Major: Organic chemistry
9. Code: 62 44 27 01
10. Supervisor: Prof. Sc. Dr. Ngo Thi Thuan
11. Summary of the new findings of the thesis:
- Synthesised 22 perovskit catalytic samples by Pechini method and synthesised 26 spinel catalytic samples by gel method. Define influences of calcination temperatures on the formation of perovskit catalytic crystallines. X-Ray analysis demonstrated Perovskite crystal - structured samples with high crystalline phase. Analyzing SEM and TEM shown that the particle size is less than 80nm with uniform distribution. The results of BET technique reveal catalytic samples have relatively large specific surface area that influence on conversion.
- Investigated activity of 22 Perovskite catalytic samples and 26 spinel catalytic samples for toluene oxidation reactions in the liquid phase. Perovskit catalyst gives the highest conversion of 18.1% (with alcol benzylic’s content of 41.1%, benzaldehyde’s content of 41.8%) on the LaCo0.3Cu0.7O3 sample. Spinel catalyst gives the highest conversion of 13.5% on the NiFeCrO4 sample. The catalytic samples replaced by the metals group B reached higher conversions than that of unreplaced samples. Catalytic activity depends on specific surface area and nature of metal ions. For perovskit catalyst, catalytic activity for the toluene oxidation reaction in the liquid phase descreased in the order Cu>Co>Fe>Mn while spinel catalyst those descreased in the order Ni>Cu>Co>Mn. Consequently, influence of the nature of the metal on the catalytic activity of two synthesized catalysts is the same. The obtained results shown that Perovskite catalyst were higher in conversion than spinel.
Investigated activity of 22 perovskite catalytic samples and 26 spinel catalytic samples for toluene oxidation reactions in the gas phase. Perovskit catalyst gives the highest conversion of 80.3% on the LaCo0.3Cu0.7O3 sample. Spinel catalyst gives the highest conversion of 70.4% on the NiFeCrO4 sample. Spinel catalytic samples replaced by metal have higher conversions than unreplaced samples. This result maintain when replacing Co by Cu ; Fe by Cu and Fe by Co in perovskite catalytic samples. In the case of replacing metal Mn by Cu; Co; Fe , catalytic activity were less than that of unreplaced samples.. For perovskit catalyst, catalytic activity for the toluene oxidation reaction in the gas phase increased in the order Mn<Fe<Co<Cu while spinel catalyst in the order Mn<Co<Cu<Ni. These results are similar to the liquid phase, however, effect of each sample is different. Consequently, influence of the nature of the metal on the catalytic activity of two synthesized catalysts is the similar. The obtained results shown that Perovskite catalyst were higher in conversion than spinel.
- Studied activity of catalytic samples for toluene completely oxidation reactions in the gas phase. The results depicted LaCo0,7Cu0,3O3 oxidized 50% toluen in gas flow at 220oC and completely oxidation at 330oC. This sample is the best in synthesised perovskite and spinel catalytic samples.
12. Practical applicability, if any:
13. Further research directions, if any:
14. Thesis-related publications:
1. Ngo Thi Thuan, Nguyen The Huu (2009), “Selective liquid phase oxidation of toluene over catalyst LaFe0,7Cu0,3O3”, Journal of Chemistry,Vol.47, No.2A,pp.25-28.
2. Ngo Thi Thuan, Nguyen Tien Thao, Pham Thi Tham, Nguyen The Huu (2009), “Calcination temperature effect on LaCrO3 perovskite structure supported on the mesoporous material ”, Journal of Chemistry,Vol.47, No.4A,pp.551-555
3. Ngo Thi Thuan, Nguyen The Huu (2009), “Complete oxidation of toluene over catalyst LaCo0.3Cu0.7O3”, Journal of Chemistry,Vol.47, No.6A,pp.194 – 198.
4. Ngo Thi Thuan, Nguyen The Huu (2010), “Study on several factors effect to spinel catalytic activity (CoxCu1-x)Fe2O4”, Journal of Science and Technology,Vol. 48, No. 2A, pp. 287 – 292.
5. Ngo Thi Thuan, Nguyen The Huu (2010), “Study on complete oxidation of toluene over catalyst LaCo0,1Cu0,9O3”, Journal of Science and Technology,Vol. 48, No.2A, pp. 281 – 286.
6. Nguyen The Huu, Ngo Thi Thuan (2010), “Selective oxidation of liquid toluene over spinel CoCrFeO4 catalyst”, Journal of Science and Technology (Hanoi University of industry),Vol. 2, pp. 60- 63.
7. Ngo Thi Thuan, Do Tien Khoa, Nguyen The Huu (2010) “Study on complete oxidation of toluene over spinel catalyst CoFeCrO4”, Journal of Chemistry and Application, Vol. 3/2010, pp. 24-27.
8. Ngo Thi Thuan, Nguyen The Huu, Do Tien Khoa (2010) “Selective liquid phase oxidation of toluene over catalyst La(CoxCu1-x)O3”, Journal of Chemistry,Vol.48, No.4C,pp.101 – 105.
9. Ngo Thi Thuan, Nguyen The Huu (2010) “Study on several factors effect to complete oxidation of toluen over perovskites catalytic La(CoxCu1-x)O3”, Journal of Chemistry,Vol.48, No.4C,pp. 106 – 110.
10. Ngo Thi Thuan, Nguyen The Huu, Do Tien Khoa (2010) “Selective Oxidation of Toluene on LaB0.7Cu0.3O3 (B = Mn, Fe, Co)-type Perovskite Oxide Catalysts in Gas Phase”, Tạp chí hóa học, Vol. 48,No. 4C, pp.46 – 50.
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