Study on calcium catalyzes coal spontaneous combustion

Metal elements are good catalysts for oxidation reactions. In order to explore the influence of metal elements in coal on the reaction of organic matter in coal with oxygen, this paper studies the influence of the macro-element calcium in coal on the spontaneous combustion of coal. Using experiments to simulate the spontaneous combustion reaction process of coal, the results show that CaO, CaCO3 and Ca(Ac)2 have a catalytic effect on the oxidation of organic matter in coal. In-situ infrared spectroscopy is used to analyze the changes of characteristic functional groups in the process of calcium catalyzed by coal oxidation. It is believed that calcium enters the coal structure by ion exchange and has a catalytic effect in the form of calcium oxide. The calcium oxide in the coal structure cracks the alkyl side chains on the condensed aromatic hydrocarbons to generate aliphatic hydrocarbons and a part of small molecular hydrocarbons. The catalytic effect of calcium-containing catalysts is determined by the content of moisture and carboxyl groups in the coal. The results can provide new ideas for preventing the spontaneous combustion of coal.