A. Introduction Biogas – a term that has been synonymous to the rural culture, a viable alternate

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A. Introduction
Biogas – a term that has been synonymous to the rural culture, a viable alternate to the rapidly depleting conventional sources, a resource whose production is cheaper, and almost cent percent of the raw materials used to produce it get utilised. Owing to the tremendous rise in the fuel consumption, we need to search for substitutes – one that can replace (the already not-so-left resources), revive (a less polluting option) and replenish (the present state of livelihood).
In this report, I’d discuss about one of the adsorption techniques involved in the removal of hydrogen sulphide – a vital component of biogas which needs to be removed from the source gas (apart from water and carbon dioxide which are in excess proportions
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Biogas which mostly consists of methane and carbon dioxide is then stored on the top of the digester tank or is extracted to the nearby gas holders. Depending on the production processes and the type of organic matter used, biogas may require treatment to remove toxic gases such as hydrogen sulphide and certain trace components.
D. Removal Techniques
Biogas contains a significant amount of sulphur, in the form of H2S, which needs to be de-sulphurised before any further application. Desulphurisation of gaseous fuel can be done on various adsorbents depending on the temperature of feed gas. In processes involved at room temperature, the catalytic reactions are supressed by the effect of the combined factors of the porosity of adsorbents. The techniques involved are classified as: (i) removal of H2S during digestion and (ii) removal of H2S after digestion. In the former case, factors like conc. of H2S remaining considerably high, low efficiency, expensive operation costs, etc. relatively leads to the latter category. A prime example of the latter category is the adsorption on activated carbon.
E. Adsorption on Activated Carbon
Activated carbons are advantageous as adsorbents and catalyst supports because they offer high surface area, developed pore volume, unique surface properties and are used for surface chemistry modification. Activated carbon materials have random cross-linked networks, which provide highly

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