A TG-FTIR investigation to the catalytic effect of mineral matrix in oil shale on the pyrolysis and combustion of kerogen

► XRD test identifies the minerals in oil shale. ► Minerals increase the reactivity of organic matter in oil shale. ► The promoting effect of minerals on the oxidization of kerogen expresses in two aspects. ► Part of the pyrite in the samples will be converted into new organic sulfur compounds.