Evaluation of ion exchange-modified Y and ZSM5 zeolites in Cr(VI) biosorption and catalytic oxidation of ethyl acetate

被引：45

作者：

Silva, B. ^{[1
]}

Figueiredo, H. ^{[1
]}

Soares, O. S. G. P. ^{[2
]}

Pereira, M. F. R. ^{[2
]}

Figueiredo, J. L. ^{[2
]}

Lewandowska, A. E. ^{[3
]}

Banares, M. A. ^{[3
]}

Neves, I. C. ^{[4
]}

Tavares, T. ^{[1
]}

机构：

[1] Univ Minho, IBB, Ctr Biol Engn, P-4710057 Braga, Portugal

[2] Univ Porto, LCM, Associate Lab LSRE LCM, Chem Engn Dept,Fac Engn, P-4200465 Oporto, Portugal

[3] CSIC, Catalyt Spect Lab, Inst Catalysis & Petrochem, E-28049 Madrid, Spain

[4] Univ Minho, Dept Chem, Ctr Chem, P-4710057 Braga, Portugal

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2012年 / 117卷

关键词：

Y zeolite; ZSM5; zeolite; Ion exchange; Cr(VI) biosorption; Catalytic oxidation; Ethyl acetate; VOLATILE ORGANIC-COMPOUNDS; METHYL-ISOBUTYL-KETONE; HIGH-PERFORMANCE; MESOPOROSITY; DEACTIVATION; POLYETHYLENE; CONVERSION; BEHAVIOR; BENZENE; ACIDITY;

D O I：

10.1016/j.apcatb.2012.02.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The aim of this work was the evaluation of the performance of two zeolites with different structures (FAU and MFI) and acidity properties in the biosorption of Cr(VI) and catalytic oxidation of ethyl acetate. The starting zeolites, Y (FAU) and ZSM5 (MFI), were modified by ion exchange treatments with NaNO3 in order to obtain zeolites with different acidity and sodium content. A biosorption system consisting of a bacterium, Arthrobacter viscosus, supported on the different zeolites was used for Cr(VI) reduction and removal from solution. The best removal efficiencies and uptake of chromium, above 90% and 14 mg(Cr)/g(zeolite) respectively, were achieved for Y zeolites due to their higher ion exchange capacity in comparison with ZSM5 zeolites. The ion exchange treatment did not produce considerable changes on the uptake process performed by the modified zeolites. Y and ZSM5 zeolites were characterized by ICP-AES, SEM, NH3 chemisorption, XRD and N-2 adsorption. Y and ZSM5 zeolites obtained after biosorption presented chromium loadings between 0.92 and 1.20%, and were successfully reused as catalysts in the oxidation of ethyl acetate. The chromium-loaded ZSM5 zeolites were considerably more active and selective towards CO2 than chromium-loaded Y zeolites, essentially due to their different framework structure, textural and acidity properties. The different sodium content of Y and ZSM5 zeolites did not produce marked changes in the catalytic behaviour of these catalysts. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：406 / 413

页数：8

共 40 条

[1] Effect of hydrogen treatment on the performance of Cr-ZSM-5 in deep oxidative decomposition of ethyl acetate and benzene in air [J].