Vietnam Journal of Catalysis and Adsorption

jca vol7 1 2018Volume 7, Issue 1, April 2018

ISSN: 0866-7411

 

 

In this issue (21 articles)

 

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REVIEW PAPER

Vai trò các chất xúc tác trong phát triển nhiên liệu sinh học
Role of Catalysts in the Development of Biofuels Production

Hồ Sĩ ThoảngThis email address is being protected from spambots. You need JavaScript enabled to view it.

Viện Khoa học vật liệu ứng dụng, Viện Hàn lâm Khoa học và Công nghệ Việt Nam

ABSTRACT

Nowadays renewable fuels, mainly biofuels, are drawing the attention of scientific and technological communities. But first-generation biofuels, i.e. ethanol and biodiesel made from vegetable oils and animal fats, due to certain disadvantages, seem to be increasingly unattractive to governments as well as private investors. Recently, the research on direct conversion of biomass to fuels has been of particular interest. This is a very attractive research direction, because the successful conversion of practically any form of biomass into fuels and chemicals should be of global strategic importance in the foreseeable future. This review shows the results of recent studies obtained by various reseachers worldwide on the conversion of biomasses to “sustainable” biofuels, but the main attention is focused on the two-stage conversion of biomasses, especially on the second stage of catalytic hydrodeoxygenating intermediate products of first stage - fast pyrolysis.

Keywords: Biomass, Sustainable Biofuels, Fast Pyrolysis, Hydrodeoxygenation, Catalysts

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RESEARCH PAPER

Cu-MOF-74 as a recycable catalyst for o-acetyl subsituted phenol ester synthesis via direct oxidative esterification of 2-(benzo[d]thiazol-2-yl)phenol with benzyl alcohol

Hoang Thi Thanh1, Lieu Ngoc Thien1, Huynh Dac Hong Ngoc1, Dang Huynh Giao1,2Phan Thanh Son Nam1This email address is being protected from spambots. You need JavaScript enabled to view it.

1Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM, Vietnam
2College of Engineering Technology, Can Tho University, Vietnam

ABSTRACT

A crystalline porous metal-organic framework Cu-MOF-74 (also known as Cu-CPO-27) was synthesized and characterized by several methods including PXRD, TGA, FT-IR, SEM, and nitrogen physisorption measurements. The Cu-MOF-74 was used as an efficient heterogeneous catalyst for the oxidative esterification of 2-(benzo[d]thiazol-2-yl)phenol with benzyl alcohol to form 2-(benzo[d]thiazol-2-yl)phenyl benzoate as desired product. The direct C–O coupling reaction could proceed readily, with more than 77 % reaction yield being achieved after 120 min at 100 oC in the presence of 5 mol% Cu-MOF-74 catalyst and tert-butyl hydroperoxide in decane as an oxidant. The Cu-MOF-74 exhibited higher activity than other MOFs and traditional homogeneous catalysts in the direct oxidative reaction. The Cu-MOF-74 could be recovered and reused three times without a significant degradation in catalytic activity and selectivity. To the best of our knowledge, this transformation using heterogeneous catalyst was not previously mentioned in the literature. 

Keywords: Cu-MOF-74, benzyl alcohol, benzoate, 2-(benzo[d]thiazol-2-yl)phenol, ester.

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RESEARCH PAPER

Synthesis of microporous organic polymers from 4,4-Bis chloremetyl-1,1 Biphenyl and Dichloro-p-xylene

Tong Thi Thanh Huong This email address is being protected from spambots. You need JavaScript enabled to view it., Cong Ngoc Thang, Tran Ngoc Tuan, Nguyen Mai Ha, Vu Van Toan, Hoang Quoc Dzung

Faculty of Oil and Gas, Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Hanoi.

ABSTRACT

This paper reports the preparation and characterization of microporous organic polymer (MOPs) synthesized from 4,4-Bis (chlorometyl)-1,1 Biphenyl and Dichloro-p-xylene with different ratio of these compounds, through the Friedel-Craft alkylation process promoted by anhydrous FeCl3. The MOPs were characterized by FT-IR, SEM, TGA, and BET. These microporous organic polymers possessed high BET specific surface areas. SBET increased lightly from 1476.36 m2/g to 1663.02 m2/g with the increasing content of dichloro-p-xylene, and the pore width average from 55.6 – 44.5 Å. The MOPs are stable at around 400oC.

Keywords: Microporous Organic Polymers, BCMBP, Friedel-Craft alkylation

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RESEARCH PAPER

Tổng hợp composite SnO2-NiO và ứng dụng làm vật liệu điện cực anot cho pin sạc Li-ion

Synthesis of SnO2-NiO composite as a material for lithium ion battery anodes

Nguyễn Xuân Phong1,Trương Thanh Tâm1,Cao Văn Hoàng1,Nguyễn Lê Tuấn1,Nguyễn Văn Kim1,Võ Viễn1,2This email address is being protected from spambots. You need JavaScript enabled to view it.

1Khoa Hóa, 2Viện Nghiên cứu ứng dụng khoa học và công nghệ,
Trường Đại học Quy Nhơn

ABSTRACT

SnO2 and SnO2-NiO composite have been synthesized using hydrothermal methods. The materials are characterized by means of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Their electrochemical properties as anodes of lithium ion batteries are examined by cyclic voltammetry and galvanostatic discharge–charge tests. The significant improvement in reversible capacity and good cycling stability are observed for the SnO2-NiO composite compared to single SnO2.

Keywords: Lithium ion batteries anodes, SnO2-NiO, SnO2, composites

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RESEARCH PAPER

Chế tạo và đặc trưng các xúc tác trên cơ sở Ni-Ga dạng hợp kim nguyên chất, Ni-Ga/oxit hỗn hợp và Ni-Ga/mesosilica

Preparation and characterization of Ni-Ga based catalysts including Ni-Ga neat alloy, Ni-Ga/mixed oxides and Ni-Ga/mesosilica

Đặng Hồng Toan, Vũ Đức Huy, Vũ Đức Quảng, Nguyễn Khánh Diệu Hồng This email address is being protected from spambots. You need JavaScript enabled to view it.

Viện Kỹ thuật Hóa học, Trường Đại học Bách khoa Hà Nội

ABSTRACT

Ni-Ga based catalysts including Ni-Ga neat alloy, Ni-Ga/mixed oxides and Ni-Ga/mesosilica, were prepared through melting method, co-condensation-evaporation method and impregnation method, respectively, and were characterized for their crystalline and mesoporous structure and morphology. Results showed that the Ni-Ga neat catalyst contained impure crystalline structures, the Ni-Ga/mixed oxides had high density of Ni5Ga3 phase and Ni-Ga/mesosilica exhibited the highest ordered mesoporous and distributed Ni5Ga3 crystals. Various techniques including XRD, SEM, TEM were used to characterize the catalyst properties. These catalysts had promise potentials in methanol synthesis process from CO2 – one of the most important process of the “Methanol Economy” in the future.

Keywords: Ni-Ga catalyst, alloy catalyst, methanol economy, mesoporous catalyst.

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RESEARCH PAPER

Preparation of zinc oxide/zinc hydroxide carbonate on activated carbon composites for degradation of janus green B

Phung Thi Hoai Anh1, Nguyen Thi Van2, Vu Anh Tuan2, This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Luong The Vinh High School, Ba Vi, Hanoi
School of Chemical Engineering, Hanoi University of Science and Technology

ABSTRACT

In this study, zinc oxide and zinc hydroxide carbonate on activated carbon composites (ZnO/ZHC/AC) were successfully synthesized by hydrothermal method without calcination step and used for photodegradation of Janus Green B (JGB) under UV irradiation. The as-synthesized samples were characterized by SEM, XRD and N2 adsorption/desorption. The photocatalytic experiments showed that the combination of ZnO/ZHC on AC can improve the photocatalytic activity and the ZnO/ZHC/10AC catalyst had the highest photocatalytic ability among as-synthesize composites. The enhanced photocatalytic activity was attributed the facilely adsorption of dye molecules on surface catalyst and the inhibition the recombination of photogenerated electro-hole species.

Keywords: Photodegradation, Zinc Oxide, Zinc Hydroxide Carbonate, Activated Carbon, Janus Green B

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RESEARCH PAPER

Synthesis of 2-arylquinazolinones via ring expansion reaction of 2-arylindo with amines under metal-organic framework catalysis

Pham Thanh Liem1, Nguyen Thi Ngoc Tran1, Hoang Thi Thanh1, Lieu Ngoc Thien1, Dang Huynh Giao1,2, Phan Thanh Son Nam1This email address is being protected from spambots. You need JavaScript enabled to view it.

1Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM, Vietnam
2College of Engineering Technology, Can Tho University, Vietnam

ABSTRACT

A crystalline metal-organic framework Cu-CPO-27 (also known as Cu-MOF-74) was synthesized and characterized by several methods including X-ray powder diffraction (PXRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The Cu-CPO-27 was used as an efficient catalyst for the synthesis of 2-arylquinazolinones via ring expansion reaction of 2-arylindoles with amines to form 3-phenethyl-2-phenylquinazolin-4(3H)-one as the desired product. The copper-catalyzed reaction could proceed readily, with more than 94 % reaction yield being achieved after 24 h at 80 oC in the presence of 7.5 mol% Cu-CPO-27 catalyst. This material exhibited higher catalytic activity in the coupling reaction than that of other MOFs such as Cu(BDC), Cu(OBA), Co2(dhtp), and homogeneous copper catalysts. The transformation could only proceed to obtain major product in the presence of the Cu-MOF. It was possible to recover the Cu-CPO-27 catalyst by simple filtration separation, and reutilize them for the reaction without a significant decline in catalytic efficiency.

Keywords: Copper-catalyzed, Metal-organic framework, Quinazolinones, Ring expansion reaction, Amines.

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RESEARCH PAPER

Tổng hợp composite SnO2/M (M=graphene oxide, g-C3N4) dùng làm vật liệu anốt cho pin sạc liti

Synthesis of SnO2/M (M = graphene oxide and g-C3N4) composites as Lithium-ion battery anode materials

Nguyễn Thị Kim Chung1, Trương Thanh Tâm1, Cao Văn Hoàng1, Nguyễn Văn Kim1, Võ Viễn1,2 This email address is being protected from spambots. You need JavaScript enabled to view it.

1Khoa Hóa, Trường Đại học Quy Nhơn
2Viện Nghiên cứu ứng dụng khoa học và công nghệ, Trường Đại học Quy Nhơn, 170 An Dương Vương, Quy Nhơn, Bình Định

ABSTRACT

SnO2/M (M = graphen oxit (GO), g-C3N4) composites were hydrothermally synthesized using sodium citrate as a structure directing agent. The obtained composites were characterized by X-Ray diffraction, scanning electron microscopy, infrared spectrum and thermogravimetric analysis. The results showed that the composites contain SnO2 nanoparticle grown on the GO and g-C3N4, which exhibited a good performance in lithium storage.

Keywords: SnO2, graphen oxit, g-C3N4, lithium ion battery

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