University of Twente Student Theses


Researching the stability of CaO from different precursors under varying absorption times

Plugge, M. (2015) Researching the stability of CaO from different precursors under varying absorption times.

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Abstract:Climate change is becoming a serious issue and carbon dioxide emissions need to be cut drastically in order to avert disaster. One way of making sure carbon dioxide does not enter the atmosphere is by making sure it is filtered from the waste flow. Many different technologies are currently being researched, among which the calcium looping cycle. CaO could absorb CO2 before it reaches the atmosphere and can be recovered through a relatively easy thermal treatment. Considering it is a very cheap material it is of importance to thoroughly investigate this subject. Calcium carbonate, calcium L-ascorbate and calcium D-gluconate were chosen as precursors for CaO in this research. Using various calcination temperatures (750 °C, 800 °C, 850 °C, 900 °C) a plethora of different samples were synthesised, of which the ones with the highest absorption capability (read internal surface area) were chosen for absorption/desorption cycle research. The highest internal surface areas were found at a calcination temperature of 850 °C, at which the calcium carbonate produced the sample with the highest internal surface area (34,54 m2/g). The chosen samples underwent absorption cycles lasting 6, 12 or 30 minutes in order to investigate the effect of non-complete conversion of CaO on the stability of the sample. It became clear that shorter absorption cycles vastly increase the stability of the sample. Theoretically speaking a calcium carbonate sample prepared at 850 °C would provide the best results utilising 6 minute absorption cycles. Of the tested samples in practice the calcium oxide sample from calcium L-ascorbate prepared at 900 °C yielded the best results utilising 6 minute absorption cycles, retaining 97,1% of its initial performance after 5 cycles.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:35 chemistry
Programme:Chemical Engineering BSc (56960)
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