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)