Eggshells are comprised of a network of protein fibers, associated with crystals of calcium carbonate (CaCO3), magnesium carbonate (MgCO3) and calcium phosphate (Ca3(PO4)2), and also of organic substances and water. CaCO3, the major constituent of the eggshell (96%), is an amorphous crystal that occurs naturally in the form of calcite (hexagonal crystal) [7]. Using eggshell wastes as raw materials for catalyst synthesis could eliminate the wastes and simultaneously produced the heterogeneous catalysts with high cost effectiveness. In fact, the agricultural and food industries are the large private sectors in Thailand [8].