Catalysis Action of Mineral/Metal Elements during Coalderived Hydrocarbons Process： An Example of the Late Permian Coal from Dahebian Coal Mine in Eastern Yunnan and Western Guizhou
矿物/金属元素在煤成烃过程中的作用——以黔西滇东上二叠统大河边煤矿煤样为例

The pyrolysis of coal with presence and absence of pyrite or Mo were carried out with different hearing ratios to study the coal bed gas formation process.The influence of pyrite and Mo on coal pyrolysis hydrocarbon-generating process was discussed.The results show that the mineral/transition metal elements make the coal have greater potential of hydrocarbon generation.Pyrite makes a positive and significant catalytic role to the methane generation.The presence of pyrite and Mo at the same time made the coal generate a few amount of heavier hydrocarbon gases,and the presence of pyrite and Mo is helpful to olefins output.Transition metal Mo has the remarkable catalytic effect on the C7—C14 generation,but the yield of C7—C14 components reduce if the presence of pyrite and Mo co-exists.Pyrite and Mo influence the peak aromatics hydrocarbon and asphalt generation.High content of transition metal elements inhibit the H2S formation from the sulfur in the coal.Catalysts have catalytic action for hydrocarbon generation at middle to high temperatures.Heating rate affects the pyrite catalysis for saturated hydrocarbon,aromatic hydrocarbon and asphalt,indicating it would be an important factor for mineral/elements catalysis in the generation of hydrocarbons at geological geothermal conditions.