Abstract
Catalysts are needed in a chemical reaction. With a catalyst it will accelerate the rate of chemical reactions. This saves time and money compared to chemical reactions without a catalyst. Catalysts are classified into two types, namely homogeneous and heterogeneous catalysts. CaO is a compound classified as a heterogeneous catalyst. Limestone has the potential as a base for the synthesis of CaO compounds. There are 3 stages in the synthesis of CaO compounds. The first stage is the preparation of limestone. The second stage is limestone calcination with temperature variations. The third stage is the characterization of CaO using XRD. The result of CaO synthesis is that the compound formed from calcination for 6 hours and 10 hours in limestone is a CaO compound. This is indicated by the appearance of peaks on the graph that match the reference to the CaO compound in the database. From the COD database, information was obtained that the CaO compound formed was a CaO compound with a crystalline phase. The crystalline system formed is cubic. The space group for the CaO compound formed is Fm-3m. There was no significant difference in the XRD results of the 6 hours and 10 hours calcinations, the only difference was the variation in the intensity of the peaks formed. So it can be concluded that calcination at a temperature of 1000 o C for 6 hours and 10 hours produces CaO crystals with a crystalline phase.
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