Adsorption Capacity of C02 for Postcombustion Process Using Cockle Shells

Carbon dioxide is the major contributor of greenhouse gases (GHG) emission thus
become one of the most important environmental issues around the globe. Reducing
the GHG impact has become critical to sequester C02 from fossil fuel power plants
which cover one third of all anthropogenic C02 emissions (Herzog et al.,2004). This
realization has raised some questions on the responsible use of the fossil fuels of the
emerging from the reaction that critically need for C02 management strategy and
technology to reduce projected global warming as well its impacts. As C02 emissions
have been unequivocally linked to global warming and climate change (IPCC,2007),
mitigation measures are a matter of urgency (Mercedes et al.,2010).
Calcium oxide (CaO) known to has capability as carbon dioxide (C02)
adsorbent. CaO present with precursor and can be produced via thermal
decomposition known as calcination; CaC03 ( s) ~ CaO( s) + C02 (g). The popular
natural calcium carbonate (CaC03) sources such as dolomite, limestone, and seashell
because of high percentage of calcium (Ca) present. The cockle shell is present
abundantly in Malaysia and thus provide a profitable value if the resources being
develop as an alternatives in C02 adsorbent. As a matter of fact over many study,
thermal decomposition of CaC03 relies on several factors that can affect the process of
adsorption capacity and reversibility. Thus, the objective of this study is to investigate
the presence of CaC03 in cockle shell and to demonstrate the effect of particle sizes,
calcination temperature, calcination duration and ramp rate on its adsorption capacity.
The effect has been studied with three different particle sizes (less than 0.125mm,
0.355-0.710 mm, 1-2 mm), three different calcination temperature (800°C, 850°C,
950°C),three different calcination duration (20min, 30min, 40min), and three
different ramp rate (10 °C/min, 15 °C/min, 20 °C/min).