▎ 摘　　要

NOVELTY - Catalyst comprises metal (M)/lanthanum-doped titania composite graphene material (A)-iron and cobalt/Zeolite Socony Mobil-5 (B) (M/A-B) (I) as catalyst coating. (I) contains 0.1-3 wt.% M material. The mass ratio of titania to graphene in A material is 0.2-8, and the mass percentage of lanthanum to titania in A material is 0.5-4 wt.%. The total mass of ferric-cobalt to the mass percentage of acidified Zeolite Socony Mobil-5 in B material is 0.5-5 wt.% and the molar ratio of iron and cobalt in B material is 0.25-4. USE - The catalyst is useful in purification assembly for purifying air (claimed). ADVANTAGE - The catalyst: utilizes catalyst coating with many active sites and high catalytic activity. DETAILED DESCRIPTION - Catalyst comprises metal (M)/lanthanum-doped titania composite graphene material (A)-iron and cobalt/Zeolite Socony Mobil-5 (FeCo/HZSM-5) (B) of formula (M/A-B) (I) as catalyst coating. (I) contains 0.1-3 wt.% M material. The mass ratio of titania to graphene in A material is 0.2-8, and the mass percentage of lanthanum to titania in A material is 0.5-4 wt.%. The total mass of ferric-cobalt to the mass percentage of acidified Zeolite Socony Mobil-5 in B material is 0.5-5 wt.% and the molar ratio of iron and cobalt in B material is 0.25-4. M = platinum, palladium or gold. INDEPENDENT CLAIMS are also included for preparation of catalyst, comprising (1) preparing A and B materials, (2) dispersing A and B materials in water to obtain reaction solution, adding it into titanium sol to obtain uniform mixed solution, coating the mixed solution on the substrate by vacuum coating, drying at 100-180℃ and calcining at 300-500℃ under nitrogen atmosphere for 1-5 hours to obtain composite carrier, and (3) dispersing the source liquid of M in water to obtain uniform dispersion liquid, immersing the composite carrier in the uniform dispersion liquid, taking it out after the immersion is complete, drying it at 80-150℃, and roasting at 300-60℃ under nitrogen atmosphere, and reducing at 200-600℃ in presence of hydrogen to obtain final product. purification assembly comprising two electrode plates (1) arranged at intervals. The catalyst is arranged between the two electrode plates, each one of the electrode plates is provided with a through hole (11) penetrating through its wall thickness, and the channel of the substrate material (21) communicates with the through holes of the two electrode plates, so there is a distance between the wall surface of the substrate material facing the electrode plate and the corresponding electrode plate. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of the purification assembly. 1Oppositely set electrode plate 11Wall thickness 21Porous substrate