|
1. Full name: Nguyen Hong Vinh
2. Sex: Male
3. Date of birth: August 02, 1955
4. Place of birth: Phu Tho
5. Admission decision number: 2259/SĐH from VNUH, dated December 07, 2006
6. Changes in academic process: 2512/QĐ-CTSV, date October 01, 2009 from University of Science, VNUH.
7. Official thesis title: Study on synthesis and catalytic properties of tertrary nanospinels materials AB2O4(A: Cu2+, Zn2+; B3+: Al3+, Cr3+) in oxidative dehydrogenation of ethylbenzene to styrene.
8. Major: Organic chemistry
9. Code: 62 44 27 01
10. Supervisors:
As. Pro. Dr. Hoa Huu Thu, University of Science, VNUH
Pro. Dr. Ngo Thi Thuan, University of Science, VNUH
11. Summary of the new findings of the thesis:
To have synthesized and determined the conditions influencing on formation of nanospinels ZnCr2O4, ZnAl2O4 by hydrothermal method modified. The factors have influenced on particular size: concentration of salts, hydrothermal temperature, time of thermal hydrolyse¸pH and obtained the optimal conditions:
Concentration inatial of Zn2+: 0.1M
Basic agent: NH4OH 5%
Hydrothermal temperature: 1500C
Time of thermal hydrolyse: 30h
pH of reaction milieu: 7
Calcination time: 5-6h
Calcination temperature: 500- 6000C
And then, having done two serias of nanospinels: ZnAl2-xCrxO4, Zn1-xCuxAl2O4 (x=0,25; 0,5; 0,7; 1,0 mol).
To have determined the structural and textural properties of products obtained by physical and physico- chemiscal methods: XRD, IR, TGA- DTA(DSC), SEM, TEM, BET, EDX, TPD-NH3.
To have obtained the nanoparticules of spinel materials of size of 10nm. The size of the nanoparticules have determined by equation of Scherrer and affirmed supplementarilly by TEM and BET. The nanospinels showed a high catalytic acidity an oxidative dehydrogenation of EB to ST.
To have examined the catalytic activity of nanospinel materials in oxidative dehydrogenation of EB to ST at operation conditions different: temperature, contact time, air flow velocity. The results obtained in evaluating catalytic activity of the temperature range of 200- 4000C have showed that, the catalyst ZnCr2O4 revenled a high activity at low temperature of 3500C.
The catalysts of ZnCrxAl2-xO4 and Zn1-xCuxAl2O4(x= 0; 0.25; 0.5; 0.75; 1) have showed the most selectivity in ST in liquid products. It may be an interesting result for separation of ST in the pure ST production in the large level.
The following things were also studied:
a, Influence of reaction temperature on EB conversion to ST
b, Influence of contact time on conversion of reaction
c, Influence of air flow velocity on conversion of reaction
d, Determination of catalyst’s stability depending on times on stream
e, Examination of regereration possibility of catalysts
The methods used for these studies:
The hydrothermal method modified for synthesis of nanospinels ZnCr2O4, ZnAl2O4, ZnCrxAl2-xO4 and Zn1-xCuxAl2O4(x= 0; 0.25; 0.5; 0.75; 1). It’s composed of hydrolyse of mixed salts calculated before by NH4OH 5% solution and then hydrothermal process was done in the autoclave at desired temperature and finally the products were treated at diffrient temperature in furnace in the air.
The physical methods used for studying structural and textural properties of the solid catalysts obtained: XRD, IR, TGA- DTA(DSC), SEM, TEM, BET, EDX, TPD-NH3, TPR- H2, and GC-MS for determining the product composition liquid.
12. Practical applicability, if any:
The catalyst ZnCr2O4 and several of ZnCrxAl2-xO4 serias representing a higher activity and selectivity in ST in the oxidative dehydrogenation of EB to ST.
13. Further research directions, if any:
Production of several nanospinels in biger level and practical application possibility.
14. Thesis- related publications:
1. Ngo Thi Thuan, Nguyen Thanh Loan, Nguyen Hong Vinh, Hoa Huu Thu (2007), “Possibility of Ethyl benzene Dehydrogenation to Styrene on nanospinel Catalysts of ZnxCu1-xAl2O4 (x=0; 0,5; 1,0 mol)”, Proceeding of the national conference on organic chemistry Science and Technology 4th, pp. 766-770.
2. Hoa Huu Thu, Nguyen Hong Vinh, Do Duc Thanh (2009), ”Synthesis and characterization of nanospinel catalyst ZnCr2O4 using for oxidative dehydrogenation of ethyl benzene”, Journal of Chemistry, Vol.47 (4A), pp. 556-560.
3. Ngo Thi Thuan, Nguyen Hong Vinh Hoa Huu Thu, Le Thanh Son, Nguyen Thanh Binh, Nguyen Thi Mai (2010), “Study on Synthesis and characterization of nanospinel catalyst ZnAl2O4”, Journal of Chemistry, Vol.48, pp. 329-333.
4. Nguyen Hong Vinh, Hoa Huu Thu, Le Thanh Son, Nguyen Thanh Binh, Nguyen Thi Mai (2010), “Synthesis and characterization of structural, textural and catalytic properties of several AB2O4(A = Zn2+(Cu2+);B = Al3+, Cr3+) nanospinels”, Journal of Chemistry, Vol.48(4C), pp. 147-152
|
