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Bài báo Khoa học Quốc tế năm 2018 tiếp theo

26. Tên bài báo: Titania nanosheet photocatalysts with dominantly exposed (001) reactive facets for photocatalytic NOx abatement

- Tác giả: Nguyễn Văn Huy và Cộng sự.

- Tên tạp chí: Applied Catalysis B-Environmental;  ISSN: 0926-3373; 

- ABSTRACT: The particular role of reactive facets TiO2 on photocatalytic NOx removal was systematically explored. The photo selective catalytic reduction (photo-SCR) of NOx was studied using titania nanosheet photocatalysts. The titania nanosheets were synthesized by hydrothermal method with titanium n-butoxide (TBOT) and hydrofluoric acid (HF). The synthetic pathway of transformation from TBOT (Ti precursor) to TiO2 nanosheet was clearly revealed that TiOF2 is the intermediate during the hydrothermal process. The NO conversion of titania nanosheets was found to be higher than the conversion of commercial P25 and TiO2 synthesized by the sol-gel method. Moreover, one of the titania nanosheets, FT1.5, displayed the highest efficiency of NOx removal at 393 K, but there was a trade-off relationship between NO conversion and NO2 selectivity. Our results suggest that the optimal synthetic process for highest efficiency of TiO2 nanosheet in photocatalysis is to use TBOT and HF with the F/Ti atomic ratio = 1.5 (FT1.5) at 453 K for 24 h. In summary, the synthesized TiO2 nanosheet exhibits great potential to be applied in NOx abatement.

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27. Tên bài báo: Biodiesel production by pervaporation-assisted esterification and pre-esterification using graphene oxide/chitosan composite membranes

- Tác giả: Nguyễn Văn Huy và Cộng sự.

- Tên tạp chí: Journal of the Taiwan Institute of Chemical Engineers; ISSN: 1876-1070

- ABSTRACT: In this study, a series of novel graphene oxide/chitosan (GO/CS) composite membranes was successfully synthesized and fully characterized. The performance of GO/CS composite membrane was then evaluated by integrating with the esterification of acetic acid with ethanol or the pre-esterification of palmitic acid with methanol, both essential in biodiesel production. Typically, esterification and pre-esterification are reversible reactions, which are limited by chemical equilibrium, resulting in a low product yield. In our study, reaction and separation were conducted in two separated steps or in a single one by means of a catalytic membrane. The preferential removal of water through the membrane in a PV-assisted process enhanced the conversion. The results show clearly that temperature, wt% of embedded GO within a polymeric CS-based membrane, and initial ratio of alcohol/acid are important parameters to enhance conversion because it acts on the kinetics of both pervaporation and esterification/pre esterification.
The enhanced catalytic membrane of the PV-assisted pre-esterification can only be observed when a proper amount of Amberlyst-15 catalyst is used. Additionally, the results of PV-assisted esterification/preesterification show that the ratio of water removal (by membrane) and water production (by esterification) rates play a significant role in evaluating the catalytic membrane. Under specific conditions, the conversions of PV-assisted esterification and pre-esterification by the catalytic membrane could be higher than those without PV-assisted up to 8% and 20%, respectively. This process could offer a key technology for biodiesel production in the future.

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28. Tên bài báo: Visualizing reaction pathway for the photo-transformation of NO2 and N2 into NO over WO3 photocatalyst

- Tác giả: Nguyễn Văn Huy và Cộng sự.

- Tên tạp chí: Research on Chemical Intermediates; ISSN: 0922-6168

- ABSTRACT: A photo-transformation of NO2 into NO at the N2 presence is discovered over a WO3 photocatalyst under UV/visible light irradiation. During the photoreaction, we found that both NO2 and N2 disappear and additional NO appears at the same time. A reaction pathway is proposed and verified by the results of an online chemiluminesce NOx analyzer, GC-TCD, and in situ DRIFT monitoring of the reactants and products in mixtures. The collected data indicates that NO2+ 1/2N2->2NO is an overall reaction of this photocatalytic reaction over a WO3 photocatalyst.

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29. Tên bài báo:

- Tác giả:  và Cộng sự.

- Tên tạp chí:  

- ABSTRACT:

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30. Tên bài báo:

- Tác giả:  và Cộng sự.

- Tên tạp chí:  

- ABSTRACT:

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31. Tên bài báo:

- Tác giả:  và Cộng sự.

- Tên tạp chí:  

- ABSTRACT:

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32. Tên bài báo:

- Tác giả:  và Cộng sự.

- Tên tạp chí:  

- ABSTRACT:

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33. Tên bài báo:

- Tác giả:  và Cộng sự.

- Tên tạp chí:  

- ABSTRACT:

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