Preparation method for preparing CoMnOx composite thermocatalytic material based on Co-MOF precursor

The invention belongs to the field of air pollution prevention and control, and provides a method for preparing a CoMnOx thermocatalytic material by taking Co-MOF as a precursor. The method solves the problems of low catalytic activity and poor water resistance of Co3O4, is simple to prepare, and comprises the following steps: co-dissolving metal sources manganese and cobalt in water, adding a ligand to obtain Co-MOF (at) Mn, and calcining to obtain the CoMnOx catalyst. The doping of the metal cation Mn changes the performance of the original MOF and improves the water resistance; mn is introduced and has a synergistic effect with variable-valence Co ions to promote generation of more Co < 3 + > active species, so that the catalytic activity is improved; in addition, due to doping of Mn, the morphology of Co-MOF is changed, and a substance similar to a small ball grows on a certain corner of the hexahedron. Under the conditions that the air speed is 40000ml/(g.h) and the toluene concentration is 1000ppm, the