Study on Modification of NaX Zeolites: The Cobalt II-Exchange Kinetics and Surface Property Changes under Thermal TreatmentReportar como inadecuado




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Journal of Chemistry - Volume 2016 2016, Article ID 1789680, 7 pages -

Research Article

Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Kaohsiung 807, Taiwan

Faculty of Chemistry, Dong Thap University, Dong Thap 93000, Vietnam

Forever Applied Equipment Co., Ltd., 3 Gongwu Road, Longtan Township, Taoyuan 325, Taiwan

Received 31 December 2015; Accepted 7 March 2016

Academic Editor: Barbara Gawdzik

Copyright © 2016 Hoai-Lam Tran et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The cobalt II ion-exchange process followed the Freundlich and Langmuir adsorption models as well as the pseudo-second-order kinetic model. The cobalt-exchanged contents increased when the initial CoNO32 solution concentration increased up to 0.14 mol L

at the optimal pH of 6.05. The N2 adsorption isotherms are mixed types I-II isotherms and H3 type hysteresis. Both the micropore and mesopore adsorptions occurred during the adsorption process. The modification, which is both the cobalt II exchange and thermal treatment, significantly improved the surface properties of NaX zeolites. Accordingly, the optimal temperature range is 500 to 600°C for a thermal treatment. This is consistent with the results of XRD analysis.





Autor: Hoai-Lam Tran, Maw-Suey Kuo, Wein-Duo Yang, and Yu-Chang Huang

Fuente: https://www.hindawi.com/



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