Vietnam Journal of Catalysis and Adsorption

RESEARCH PAPER

open access logo 200x200Liquid Oxidation of Styrene Mg-Cu-Al Layered Double Hydroxide Catalysts

Le Thi Kim Huyen1,2, Tran Le Huy1, Nguyen Tien Thao1,This email address is being protected from spambots. You need JavaScript enabled to view it.

1Faculty of Chemistry, VNU University of Science, Vietnam National University Hanoi
2Mien Trung Industry and Trade College

ABSTRACT

A set of CuxMg0.7-xAl0.3(OH)2(CO3)0.15.mH2O hydrotalcite-like compounds were synthesized by the co-precipitation technique at a certain pH. The synthesized samples have been characterized by some physical means of XRD, FT-IR, TEM, EDS and BET prior to use as a catalyst for the liquid oxidation of styrene with aqueous tert-butyl hydrogen peroxide (TBHP) oxidant. The synthesized samples show good hydrotalcite structure and with the presence of Cu(II) ions in layered Mg-Al hydroxides. Under similar reaction conditions, MgCuAl-CO3 layered double hydroxide catalysts exhibited good activity and high selectivity towards styrene oxide (75% selectivity at 73% styrene conversion) as compared with the MgAl-CO3, CuO/MgAl-CO3, and mixed oxides of MgCuAl-O.

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RESEARCH PAPER

open access logo 200x200Synthesis and application of Ag/TiO2 for the photocatalytic treatment of Cr(VI) in water under visible light

Ngo Sy Thuy, Tran Thi Kieu Trinh, Nguyen Hong LienThis email address is being protected from spambots. You need JavaScript enabled to view it.

School of Chemical Engineering, Hanoi University of Science and Technology, Dai Co Viet Road 1, Hanoi, Vietnam

ABSTRACT

Ag/TiO2 was synthesized by chemical deposition method. The catalyst samples were characterized by XRD, SEM, EDS and UV-Vis spectroscopy. The synthesized catalysts were tested for photocatalytic reduction of Cr(VI) in a batch reactor under UV light and Visible light irradiations. Effects of Ag content, the ratio of phenol/Cr(VI) and pH on the Cr(VI) conversion was investigated. With plasmonic effect of nano silver deposited on TiO2, the catalyst revealed activity for reduction of Cr(VI) under the visible light. The presence of phenol in the reaction solution significantly enhanced the photocatalytic reduction of Cr(VI).

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RESEARCH PAPER

open access logo 200x200Influence of organic structure directing agents on the formation of SAPOs structure

Doan Anh Tuan1, Nguyen Ngoc Khang1, Dam Le Quoc Phong1, Vuong Thanh Huyen1,2, Le Minh Thang1, Pham Thanh Huyen1,This email address is being protected from spambots. You need JavaScript enabled to view it.

1School of Chemical Engineering, Hanoi University of Science and Technology, Vietnam
2Leibniz Institute for Catalysis, University of Rostock, Germany

ABSTRACT

Silicoaluminophotphate (SAPO) are potential eco-friendly catalysts for the selective catalytic reduction (SCR) of NOx by NH3 at low-temperature. This study investigated the effects of organic structure directing agents on the formation of SAPOs structure. Different organic structure directing agents namely, triethylamine (TEA), tetramethylammonium hydroxide (TMAOH) and morpholine were chosen for the synthesis. Obtained SAPOs were characterized by XRD, FE-SEM, BET and EPR methods.
The results showed that the template TEA was preferable to synthesize SAPO-5 molecular sieve, whereas morpholine was the most suitable template for SAPO-34. TMAOH and a combination of organic templates (TMAOH and TEA) led to the formation of SAPO-11 and SAPO-37, respectively.

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RESEARCH PAPER

open access logo 200x200Catalytic cracking of cumene over ZSM-5 based catalysts obtained by direct- and post- synthetic routes

Vu Xuan Hoan1,This email address is being protected from spambots. You need JavaScript enabled to view it., Dang Thanh Tung1, Vu Duy Hung2,3, Tran Thi Nhu Mai3

1 Vietnam Petroleum Institute, 167 Trung Kinh, Yen Hoa, Cau Giay, Hanoi
2 Binh Son Refining and Petrochemical Company, 208 Hung Vuong, Tran Phu, Quang Ngai
3 Hanoi University of Science, 344 Nguyen Trai, Thanh Xuan Trung, Thanh Xuan, Hanoi

ABSTRACT

Direct- and post-synthetic approaches were explored for preparation of hierarchical ZSM-5 catalysts aiming to enhance their cracking reactivity. The resulting catalysts were thoroughly characterized by XRD, N2-sorption, AAS, ICP-AES, NH3-TPD before being tested in the cracking of cumene as a model reaction. The results show that the introduction of either intracrystalline mesopores by the post-synthetic treatment or intercrystalline mesopores by the direct-synthesis has increased the utilization of strong Brønsted acid sites inside the micropores of ZSM-5 crystals, leading to a higher cumene conversion over the hierarchical ZMS-5 compared to commercial ZSM-5.

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