Vietnam Journal of Catalysis and Adsorption

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 Viễn^{1,2 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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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 400^oC.

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

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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 Giao^1,2, Phan Thanh Son Nam^{1This 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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Volume 7, Issue 1, April 2018

ISSN: 0866-7411

In this issue (21 articles)

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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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