Selective adsorption of H2S in biogas using zeolite prepared by microwave-assisted method

Nguyen Quang Long and Hoang Thi Thu Binh *

* Corresponding author (httbinh@nomail.com)

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Received: 25 Jan 2016
Revised: 25 May 2016
Accepted: 08 Jul 2016
Published: 30 Jul 2016
DOI: 10.22144/ctu.jsi.2016.008
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Nguyen, Q. L., & Hoang, T. T. B. (2016). Selective adsorption of H2S in biogas using zeolite prepared by microwave-assisted method. CTU Journal of Innovation and Sustainable Development , (Renewable Energy), 52-56. https://doi.org/10.22144/ctu.jsi.2016.008
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No. Special Issue on Renewable Energy (2016)

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Abstract

This research focuses on development of a purification method for biogas - a potential sustainable fuel using Zn- exchanged zeolites. Different with traditional hydrothermal synthesis, the zeolite in this study has been synthesized via a microwave-assisted method in order to shorten the crystallization time. Various techniques were utilized for characterization of the adsorbents. The crystalline structure of the materials was analyzed by XRD (X-ray Diffraction). Scanning Electron Microscopy (SEM) was applied for morphology analysis. The H2S adsorption activity of the material was determined by a fixed-bed absorption column and the expressed by the H2S absorption capacity below a specified breakthrough point (50 ppm). H2S adsorption capacity of about 13 mgS/g was achieved. It was observed that although high concentration of CO2 was presented in the feed stream, the Zn-exchanged zeolite can selectively remove H2S in the gas mixture.
Keywords: Biogas, H2S, Zeolite X, microwave-assisted method, selective adsorption

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