An efficient Co-ZSM-5 catalyst for the abatement of volatile organics in air: effect of the synthesis protocol

  • A. Aziz
  • M. Sajjad
  • M. Kim
  • K. S. Kim
Original Paper


Co supported on ZSM-5 (Co-ZSM-5) catalysts was synthesized by wet ion exchange (WIE), impregnation (IM), and in situ hydrothermal (IHT) methods. Their adsorptive catalytic activities for the removal of VOC’s [Benzene, Toluene, Ethylbenzene and Toluene (BTEX)] in air were tested. The physicochemical properties were investigated by XRD, FTIR, SEM, XPS, and low-temperature N2 adsorption. The results indicate that the catalytic performance of Co-ZSM-5 for VOC’s abatement is effective and the synthesis methods reasonably influence the catalytic activity of Co-ZSM-5. Among three samples prepared by three different methods, the catalyst synthesized by the hydrothermal method possesses the highest adsorptive catalytic activity for BTEX oxidation. The optimized contact time was 60 min. The catalytic activities of the prepared catalysts are varied in the order of IHT > IM > WIE based on the combined removal capacity 59.24 > 34.46 > 23.82 (mg/g). For the Co-ZSM-5 WIE catalysts, the procedure has an evident effect on their catalytic performance. For example, the WIE catalysts prepared with cobalt chloride (II) by ion exchange have a higher acidity and surface area than the catalyst prepared with cobalt chloride (II) by impregnation method but less cobalt content. The excellent performance of IHT catalysts may be endorsed to the better availability of the oxidized form (Co3+), due to high content, higher surface area and acidity. Moreover, the Co-ZSM-5 catalyst synthesized by the IHT method shows high stability after being used.


Co-ZSM-5 Synthesis methods BTEX VOCs Air cleaning 



The authors are very grateful to the Korea Institute of Civil Engineering and Building Technology (KICT), Korea University of Science and Technology (UST), Korea for providing funds under Project Code = 2016-0158, to carry out the research work submitted with this article.

Supplementary material

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Supplementary material 1 (TIFF 6174 kb)
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Supplementary material 2 (TIFF 6440 kb)


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Copyright information

© Islamic Azad University (IAU) 2017

Authors and Affiliations

  1. 1.University of Science and Technology (UST)DaejeonRepublic of Korea
  2. 2.Environmental and Plant Engineering Research InstituteKorea Institute of Civil Engineering and Building Technology (KICT)Goyang-siRepublic of Korea
  3. 3.Pakistan Atomic Energy Commission (PAEC)IslamabadPakistan

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