Dichloromethane catalyst and preparation method thereof

The invention discloses a dichloromethane catalyst and a preparation method thereof. The dichloromethane catalyst comprises an alumina coating and a porous substrate; the surface of the porous substrate is coated with the alumina coating; a composite oxide precursor salt solution is impregnated on the porous substrate coated with the alumina coating, and then roasted to form the dichloromethane catalyst; the catalyst is prepared under normal pressure conditions; the solidly bonded alumina coating is prepared from alumina sol; composite oxide with catalytic activity can be formed through impregnating and then roasting the composite oxide precursor salt solution. The preparation method of a solution is simple, only needs the processes of impregnation and roasting, and is suitable for industrial large-scale production and application; the composite oxide formed after roasting of the selected specific composite oxide precursor salt solution has excellent catalytic activity on dichloromethane, and the catalytic co