Fixed Bed Adsorption Of Carbon Dioxide On Modified Coconut Shell Granular Activated Carbon

Simple item page
dc.contributor.authorTan, Yee Ling
dc.date.accessioned2016-11-23T00:57:22Z
dc.date.available2016-11-23T00:57:22Z
dc.date.issued2014-08
dc.description.abstractChemically modified adsorbent is attracting attention on its ability in carbon dioxide capture in order to increase the adsorption capacity and enhance its characteristics such as thermal and chemical resistance. In this research, a series of chemically modified coconut shell granular activated carbon were prepared, characterized and used in CO2 adsorption process in a fixed-bed adsorption system. Coconut shell granular activated carbon was chosen due to its large surface area, its stable properties to withstand destruct under cyclic heating and relatively low cost among the adsorbents available in the market. Basic chemicals such as triethanolamine (TEA), sodium hydroxide (NaOH), chitosan, 3-aminopropyl-triethoxysilane (APTES) and polyethylenimine (PEI) were used to modify the activated carbon. Two preparation methods were used, the impregnation method and chitosan beads preparation method by alkali gelation. The surface properties, functional groups and surface morphologies of the prepared adsorbents were characterized by BET, FT-IR and SEM, respectively. The adsorption of carbon dioxide was carried out in a fixed bed adsorption system with an online carbon dioxide analyzer to determine the concentration of carbon dioxide in the outlet gas. The effect of operating conditions such as gas flow rate (90-150 mL/min), adsorption temperature (35-55 °C), adsorbent loading (depends on the density of adsorbent) and initial CO2 concentration (10- 20%) were studied. The BET results showed that the surface area decreased and the pore characteristics changed after chemical modification. The FT-IR spectra of the unmodified and modified samples were similar due to a small dosage of chemicals was impregnated onto the activated carbon. The bed adsorption capacity of unmodified activated carbon was 17.52 mg/g with adsorbent loading 3 g, adsorption temperature 35 °C, gas flow rate 90 mL/min and 10% CO2. The highest adsorption capacity was 81.56 mg/g, which was obtained by using chitosan-PEI-AC beads with adsorbent loading of 0.5 g, adsorption temperature 35 °C, gas flow rate 90 mL/min and 10% CO2. The modified sample with the best stability in the regeneration test was 125CAC6, which decreased about 11.30% over 10 cyclic adsorption process. The results showed that chemical modification of activated carbon gave positive effects on the adsorption performance.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/3160
dc.subjectModified coconut shell granular activated carbon were prepareden_US
dc.subjectcharacterized and used in CO2 adsorption process in a fixed-bed adsorption system.en_US
dc.titleFixed Bed Adsorption Of Carbon Dioxide On Modified Coconut Shell Granular Activated Carbonen_US
dc.typeThesisen_US
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Pusat Pengajian Kejuruteraan Kimia - Tesis