CFC12 Decomposition over Shell Wastes Based Reactants

This work presents a new technique for decomposition of gaseous CFC12 (CCl2F2) by reusing shell wastes. This technique is based on direct reaction between CFC12 and alkaline based materials such as calcined dolomite and calcite, and provides practically effective CFCs decomposition at low tem- peratures (1). In this work, several kinds of alkaline-based materials including shell wastes (calcite, dolomite, Hotate (scallop) and Asari shells) were milled into small particles followed by calcination at 1000 o C in air for 12 hours. In calcination, microstructures on crashed shell particles obviously affected by sintering due to salt impurities contained in shell wastes, leading to degradation of reactivity for CFC12 decomposition. Hydration of the calcined shell sample resulted in the growth of smaller micro- grains and promoting CFC12 decomposition over shell waste based reactants.